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<script src="https://cdn.jsdelivr.net/particles.js/2.0.0/particles.min.js"></script>
<title>StudyTools India - 30+ Free Calculators & Tools for Students</title>
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<script>
// Percentage Calculator
function calcPercentage(){const v=parseFloat(document.getElementById('perc-value').value);const t=parseFloat(document.getElementById('perc-total').value);if(!v||!t){showResult('perc-result','⚠️ Please enter both values',false);return}const p=((v/t)*100).toFixed(2);showResult('perc-result',`✅ ${p}%
${v} is ${p}% of ${t}`,true)} // CGPA to Percentage function calcCGPA(){const c=parseFloat(document.getElementById('cgpa-value').value);const s=parseFloat(document.getElementById('cgpa-scale').value);if(!c){showResult('cgpa-result','⚠️ Please enter CGPA',false);return}const p=s===10?(c*9.5).toFixed(2):(c*25).toFixed(2);let g='';if(p>=90)g='A+ (Outstanding)';else if(p>=80)g='A (Excellent)';else if(p>=70)g='B+ (Very Good)';else if(p>=60)g='B (Good)';else if(p>=50)g='C (Average)';else g='D (Pass)';showResult('cgpa-result',`✅ ${p}%
Grade: ${g}`,true)} // Age Calculator function calcAge(){const d=document.getElementById('dob').value;if(!d){showResult('age-result','⚠️ Please enter date of birth',false);return}const b=new Date(d);const t=new Date();let y=t.getFullYear()-b.getFullYear();let m=t.getMonth()-b.getMonth();let days=t.getDate()-b.getDate();if(days<0){m--;days+=30}if(m<0){y--;m+=12}showResult('age-result',`🎉 ${y} years, ${m} months, ${days} days`,true)}
// JEE/NDA Countdown
function calcCountdown(){const e=document.getElementById('exam-date').value;if(!e){showResult('countdown-result','⚠️ Please enter exam date',false);return}const ex=new Date(e);const t=new Date();const diff=Math.ceil((ex-t)/(1000*60*60*24));if(diff<0)showResult('countdown-result','⚠️ Exam date has passed',false);else if(diff===0)showResult('countdown-result','🔥 Exam is TODAY! Good luck!',true);else showResult('countdown-result',`⏳ ${diff} days remaining
💪 Keep pushing!`,true)} // BMI Calculator function calcBMI(){const h=parseFloat(document.getElementById('height').value);const w=parseFloat(document.getElementById('weight').value);if(!h||!w){showResult('bmi-result','⚠️ Please enter both values',false);return}const bmi=((w/((h/100)**2)).toFixed(2));let cat='';if(bmi<18.5)cat='Underweight';else if(bmi<25)cat='Normal weight';else if(bmi<30)cat='Overweight';else cat='Obese';showResult('bmi-result',`BMI: ${bmi}
Category: ${cat}`,true)} // Grade Calculator function calcGrade(){const m=parseFloat(document.getElementById('marks').value);const t=parseFloat(document.getElementById('total-marks').value);if(!m||!t){showResult('grade-result','⚠️ Please enter both marks',false);return}const p=((m/t)*100).toFixed(2);let g='';if(p>=90)g='A+ Grade';else if(p>=80)g='A Grade';else if(p>=70)g='B+ Grade';else if(p>=60)g='B Grade';else if(p>=50)g='C Grade';else if(p>=40)g='D Grade';else g='Fail';showResult('grade-result',`🎯 ${p}%
${g}`,true)} // GPA Calculator function calcGPA(){const grades=document.getElementById('gpa-grades').value.toUpperCase().split(',').map(g=>g.trim());if(grades.length===0){showResult('gpa-result','⚠️ Please enter grades',false);return}const gradePoints={'A+':10,'A':9,'A-':8.5,'B+':8,'B':7,'B-':6.5,'C+':6,'C':5,'D':4,'F':0};let total=0;let count=0;grades.forEach(g=>{if(gradePoints[g]!==undefined){total+=gradePoints[g];count++}});if(count===0){showResult('gpa-result','⚠️ Invalid grades',false);return}const gpa=(total/count).toFixed(2);showResult('gpa-result',`🎯 GPA: ${gpa}/10
Based on ${count} grades`,true)} // Percentage to CGPA function calcPercToCGPA(){const p=parseFloat(document.getElementById('perc-to-cgpa-value').value);const s=parseFloat(document.getElementById('perc-to-cgpa-scale').value);if(!p){showResult('perc-to-cgpa-result','⚠️ Please enter percentage',false);return}const cgpa=s===10?(p/9.5).toFixed(2):(p/25).toFixed(2);showResult('perc-to-cgpa-result',`✅ CGPA: ${cgpa}/${s}`,true)}
// Attendance Calculator
function calcAttendance(){const a=parseFloat(document.getElementById('attended').value);const t=parseFloat(document.getElementById('total-classes').value);if(!a||!t){showResult('attendance-result','⚠️ Please enter both values',false);return}const p=((a/t)*100).toFixed(2);let msg='';if(p>=75)msg='✅ Great attendance!';else msg='⚠️ Need to improve';showResult('attendance-result',`${p}%
${msg}`,p>=75)} // Average Calculator function calcAverage(){const nums=document.getElementById('avg-numbers').value.split(',').map(n=>parseFloat(n.trim())).filter(n=>!isNaN(n));if(nums.length===0){showResult('average-result','⚠️ Please enter numbers',false);return}const avg=(nums.reduce((a,b)=>a+b,0)/nums.length).toFixed(2);showResult('average-result',`🧮 Average: ${avg}
Count: ${nums.length}`,true)} // Simple Interest function calcSimpleInterest(){const p=parseFloat(document.getElementById('si-principal').value);const r=parseFloat(document.getElementById('si-rate').value);const t=parseFloat(document.getElementById('si-time').value);if(!p||!r||!t){showResult('si-result','⚠️ Please enter all values',false);return}const si=(p*r*t/100).toFixed(2);const total=(parseFloat(p)+parseFloat(si)).toFixed(2);showResult('si-result',`💵 Interest: ₹${si}
Total: ₹${total}`,true)} // Compound Interest function calcCompoundInterest(){const p=parseFloat(document.getElementById('ci-principal').value);const r=parseFloat(document.getElementById('ci-rate').value);const t=parseFloat(document.getElementById('ci-time').value);const n=parseFloat(document.getElementById('ci-freq').value);if(!p||!r||!t){showResult('ci-result','⚠️ Please enter all values',false);return}const a=p*Math.pow((1+r/(100*n)),(n*t));const ci=(a-p).toFixed(2);showResult('ci-result',`💰 Interest: ₹${ci}
Total: ₹${a.toFixed(2)}`,true)} // Square Root function calcSquareRoot(){const n=parseFloat(document.getElementById('sqrt-num').value);if(!n||n<0){showResult('sqrt-result','⚠️ Please enter a positive number',false);return}const result=Math.sqrt(n).toFixed(4);showResult('sqrt-result',`√${n} = ${result}`,true)}
// Power Calculator
function calcPower(){const base=parseFloat(document.getElementById('power-base').value);const exp=parseFloat(document.getElementById('power-exp').value);if(isNaN(base)||isNaN(exp)){showResult('power-result','⚠️ Please enter both values',false);return}const result=Math.pow(base,exp).toFixed(4);showResult('power-result',`${base}^${exp} = ${result}`,true)}
// LCM Calculator
function calcLCM(){const nums=document.getElementById('lcm-numbers').value.split(',').map(n=>parseInt(n.trim())).filter(n=>!isNaN(n)&&n>0);if(nums.length<2){showResult('lcm-result','⚠️ Enter at least 2 numbers',false);return}const gcd=(a,b)=>b===0?a:gcd(b,a%b);const lcm=(a,b)=>(a*b)/gcd(a,b);const result=nums.reduce((a,b)=>lcm(a,b));showResult('lcm-result',`🔢 LCM = ${result}`,true)}
// HCF Calculator
function calcHCF(){const nums=document.getElementById('hcf-numbers').value.split(',').map(n=>parseInt(n.trim())).filter(n=>!isNaN(n)&&n>0);if(nums.length<2){showResult('hcf-result','⚠️ Enter at least 2 numbers',false);return}const gcd=(a,b)=>b===0?a:gcd(b,a%b);const result=nums.reduce((a,b)=>gcd(a,b));showResult('hcf-result',`🔡 HCF/GCD = ${result}`,true)}
// Prime Number Checker
function checkPrime(){const n=parseInt(document.getElementById('prime-num').value);if(!n||n<2){showResult('prime-result','⚠️ Enter a number ≥ 2',false);return}let isPrime=true;for(let i=2;i<=Math.sqrt(n);i++){if(n%i===0){isPrime=false;break}}showResult('prime-result',isPrime?`✅ ${n} is PRIME`:`❌ ${n} is NOT prime`,isPrime)}
// Factorial
function calcFactorial(){const n=parseInt(document.getElementById('fact-num').value);if(!n||n<0||n>170){showResult('factorial-result','⚠️ Enter 0-170',false);return}let fact=1;for(let i=2;i<=n;i++)fact*=i;showResult('factorial-result',`${n}! = ${fact.toExponential(2)}`,true)}
// Quadratic Equation
function solveQuadratic(){const a=parseFloat(document.getElementById('quad-a').value);const b=parseFloat(document.getElementById('quad-b').value);const c=parseFloat(document.getElementById('quad-c').value);if(isNaN(a)||isNaN(b)||isNaN(c)||a===0){showResult('quadratic-result','⚠️ Invalid values (a≠0)',false);return}const disc=b*b-4*a*c;if(disc<0){showResult('quadratic-result','No real roots',false)}else{const x1=((-b+Math.sqrt(disc))/(2*a)).toFixed(2);const x2=((-b-Math.sqrt(disc))/(2*a)).toFixed(2);showResult('quadratic-result',`x₁ = ${x1}
x₂ = ${x2}`,true)}} // Pythagorean Theorem function calcPythagorean(){const a=parseFloat(document.getElementById('pyth-a').value);const b=parseFloat(document.getElementById('pyth-b').value);if(!a||!b){showResult('pythagorean-result','⚠️ Enter both sides',false);return}const c=Math.sqrt(a*a+b*b).toFixed(2);showResult('pythagorean-result',`📐 Hypotenuse (c) = ${c}`,true)}
// Area Calculator
function calcArea(){const shape=document.getElementById('area-shape').value;const val1=parseFloat(document.getElementById('area-val1').value);if(!val1){showResult('area-result','⚠️ Enter value',false);return}let area=0;if(shape==='circle')area=Math.PI*val1*val1;else if(shape==='square')area=val1*val1;else if(shape==='rectangle'){const val2=parseFloat(prompt('Enter width:'));area=val1*val2}else if(shape==='triangle'){const val2=parseFloat(prompt('Enter height:'));area=0.5*val1*val2}showResult('area-result',`🟦 Area = ${area.toFixed(2)} sq units`,true)}
// Volume Calculator
function calcVolume(){const shape=document.getElementById('volume-shape').value;const val1=parseFloat(document.getElementById('volume-val1').value);if(!val1){showResult('volume-result','⚠️ Enter value',false);return}let vol=0;if(shape==='sphere')vol=(4/3)*Math.PI*Math.pow(val1,3);else if(shape==='cube')vol=Math.pow(val1,3);else if(shape==='cylinder'){const h=parseFloat(prompt('Enter height:'));vol=Math.PI*val1*val1*h}else if(shape==='cone'){const h=parseFloat(prompt('Enter height:'));vol=(1/3)*Math.PI*val1*val1*h}showResult('volume-result',`📦 Volume = ${vol.toFixed(2)} cubic units`,true)}
// Temperature Converter
function convertTemp(){const val=parseFloat(document.getElementById('temp-value').value);const from=document.getElementById('temp-from').value;const to=document.getElementById('temp-to').value;if(isNaN(val)){showResult('temp-result','⚠️ Enter temperature',false);return}let result=0;if(from===to)result=val;else if(from==='celsius'&&to==='fahrenheit')result=(val*9/5)+32;else if(from==='celsius'&&to==='kelvin')result=val+273.15;else if(from==='fahrenheit'&&to==='celsius')result=(val-32)*5/9;else if(from==='fahrenheit'&&to==='kelvin')result=((val-32)*5/9)+273.15;else if(from==='kelvin'&&to==='celsius')result=val-273.15;else if(from==='kelvin'&&to==='fahrenheit')result=((val-273.15)*9/5)+32;showResult('temp-result',`🌡️ ${result.toFixed(2)}° ${to.charAt(0).toUpperCase()}`,true)}
// Length Converter
function convertLength(){const val=parseFloat(document.getElementById('length-value').value);const from=document.getElementById('length-from').value;const to=document.getElementById('length-to').value;if(isNaN(val)){showResult('length-result','⚠️ Enter length',false);return}const units={meter:1,kilometer:0.001,centimeter:100,feet:3.28084,inch:39.3701,mile:0.000621371};const inMeters=val/units[from];const result=inMeters*units[to];showResult('length-result',`📏 ${result.toFixed(4)} ${to}`,true)}
// Weight Converter
function convertWeight(){const val=parseFloat(document.getElementById('weight-value').value);const from=document.getElementById('weight-from').value;const to=document.getElementById('weight-to').value;if(isNaN(val)){showResult('weight-result','⚠️ Enter weight',false);return}const units={kilogram:1,gram:1000,pound:2.20462,ounce:35.274};const inKg=val/units[from];const result=inKg*units[to];showResult('weight-result',`⚖️ ${result.toFixed(4)} ${to}`,true)}
// Speed Calculator
function calcSpeed(){const dist=parseFloat(document.getElementById('speed-dist').value);const time=parseFloat(document.getElementById('speed-time').value);if(!dist||!time){showResult('speed-result','⚠️ Enter both values',false);return}const speed=(dist/time).toFixed(2);showResult('speed-result',`🚀 Speed = ${speed} km/h`,true)}
// Binary Converter
function convertBinary(){const input=document.getElementById('binary-input').value.trim();const from=document.getElementById('binary-from').value;if(!input){showResult('binary-result','⚠️ Enter a number',false);return}let decimal=0;try{if(from==='decimal')decimal=parseInt(input,10);else if(from==='binary')decimal=parseInt(input,2);else if(from==='hex')decimal=parseInt(input,16);const binary=decimal.toString(2);const hex=decimal.toString(16).toUpperCase();showResult('binary-result',`Dec: ${decimal}
Bin: ${binary}
Hex: ${hex}`,true)}catch(e){showResult('binary-result','⚠️ Invalid input',false)}}
// Roman Numeral Converter
function convertRoman(){const input=document.getElementById('roman-input').value.trim().toUpperCase();if(!input){showResult('roman-result','⚠️ Enter value',false);return}if(/^[0-9]+$/.test(input)){const num=parseInt(input);if(num<1||num>3999){showResult('roman-result','⚠️ Enter 1-3999',false);return}const values=[1000,900,500,400,100,90,50,40,10,9,5,4,1];const symbols=['M','CM','D','CD','C','XC','L','XL','X','IX','V','IV','I'];let roman='';for(let i=0;i=values[i]){roman+=symbols[i];num-=values[i]}}showResult('roman-result',`🏛️ ${roman}`,true)}else{const romanValues={I:1,V:5,X:10,L:50,C:100,D:500,M:1000};let num=0;for(let i=0;iFinal Price: ₹${final}`,true)}
// Tip Calculator
function calcTip(){const bill=parseFloat(document.getElementById('tip-bill').value);const tipPerc=parseFloat(document.getElementById('tip-perc').value);if(!bill||!tipPerc){showResult('tip-result','⚠️ Enter both values',false);return}const tip=(bill*tipPerc/100).toFixed(2);const total=(parseFloat(bill)+parseFloat(tip)).toFixed(2);showResult('tip-result',`🍴 Tip: ₹${tip}
Total: ₹${total}`,true)} // Time Duration Calculator function calcTimeDuration(){const start=document.getElementById('time-start').value;const end=document.getElementById('time-end').value;if(!start||!end){showResult('time-duration-result','⚠️ Enter both times',false);return}const [h1,m1]=start.split(':').map(Number);const [h2,m2]=end.split(':').map(Number);let hours=h2-h1;let mins=m2-m1;if(mins<0){hours--;mins+=60}if(hours<0)hours+=24;showResult('time-duration-result',`⏱️ ${hours}h ${mins}m`,true)}
// Statistics Calculator
function calcStatistics(){const nums=document.getElementById('stats-numbers').value.split(',').map(n=>parseFloat(n.trim())).filter(n=>!isNaN(n));if(nums.length===0){showResult('stats-result','⚠️ Enter numbers',false);return}nums.sort((a,b)=>a-b);const mean=(nums.reduce((a,b)=>a+b,0)/nums.length).toFixed(2);const median=nums.length%2===0?((nums[nums.length/2-1]+nums[nums.length/2])/2).toFixed(2):nums[Math.floor(nums.length/2)].toFixed(2);const range=(nums[nums.length-1]-nums[0]).toFixed(2);showResult('stats-result',`Mean: ${mean}
Median: ${median}
Range: ${range}`,true)} // Fraction Calculator function calcFraction(){const frac1=document.getElementById('frac1').value.split('/').map(n=>parseInt(n.trim()));const frac2=document.getElementById('frac2').value.split('/').map(n=>parseInt(n.trim()));const op=document.getElementById('frac-op').value;if(frac1.length!==2||frac2.length!==2){showResult('fraction-result','⚠️ Invalid format',false);return}let [n1,d1]=frac1;let [n2,d2]=frac2;let resNum=0,resDen=0;if(op==='add'){resNum=n1*d2+n2*d1;resDen=d1*d2}else if(op==='subtract'){resNum=n1*d2-n2*d1;resDen=d1*d2}else if(op==='multiply'){resNum=n1*n2;resDen=d1*d2}else if(op==='divide'){resNum=n1*d2;resDen=d1*n2}const gcd=(a,b)=>b===0?a:gcd(b,Math.abs(a%b));const g=gcd(Math.abs(resNum),Math.abs(resDen));resNum/=g;resDen/=g;showResult('fraction-result',`➗ ${resNum}/${resDen}`,true)}
// Helper function to show results
function showResult(id,html,success){const el=document.getElementById(id);el.innerHTML=html;el.classList.remove('show');setTimeout(()=>el.classList.add('show'),10);setTimeout(()=>el.classList.remove('show'),5000)}
// Search functionality
function searchTools(){const q=document.getElementById('searchBox').value.toLowerCase();const cards=document.querySelectorAll('.tool-card');cards.forEach(card=>{const tool=card.getAttribute('data-tool');const title=card.querySelector('h3').textContent.toLowerCase();const desc=card.querySelector('p').textContent.toLowerCase();if(tool.includes(q)||title.includes(q)||desc.includes(q)){card.style.display='block'}else{card.style.display='none'}})}
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<meta name="keywords" content="percentage calculator, CGPA calculator, GPA calculator, ISC calculator, CBSE calculator, JEE calculator, NDA calculator, student tools India, free calculator, age calculator, BMI calculator, grade calculator, study tools">
<meta name="author" content="Shashank Kushwaha">
<meta name="robots" content="index, follow">
<link rel="canonical" href="https://return7521-ui.github.io/studytools-india/">
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<meta property="og:url" content="https://return7521-ui.github.io/studytools-india/">
<meta property="og:title" content="StudyTools India - Free Online Calculators for Students">
<meta property="og:description" content="Free online calculators for students - 30+ tools including Percentage, CGPA, Age, BMI, Grade calculators. Study tools for JEE, NDA, ISC, CBSE students.">
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<meta name="coverage" content="Worldwide">
<meta name="target" content="Students, Teachers, Educational Institutions">
<meta name="subject" content="Online Calculators for Students">
<meta name="topic" content="Education Tools">
<meta name="summary" content="Free online calculators and study tools for students">
<meta name="designer" content="Shashank Kushwaha">
<meta name="reply-to" content="support@studytools.india">
<meta name="owner" content="StudyTools India">
<meta name="url" content="https://return7521-ui.github.io/studytools-india/">
<meta name="identifier-URL" content="https://return7521-ui.github.io/studytools-india/">
<meta name="directory" content="submission">
<meta name="pagename" content="StudyTools India - Home">
<meta name="Category" content="Education">
<meta name="coverage" content="Worldwide">
<!-- === SECTION 6: GEO LOCATION TAGS === -->
<meta name="geo.region" content="IN">
<meta name="geo.placename" content="India">
<meta name="geo.position" content="20.5937;78.9629">
<meta name="ICBM" content="20.5937, 78.9629">
<!-- === SECTION 7: PRELOAD & PERFORMANCE OPTIMIZATION === -->
<link rel="dns-prefetch" href="//fonts.googleapis.com">
<link rel="dns-prefetch" href="//fonts.gstatic.com">
<link rel="dns-prefetch" href="//cdn.jsdelivr.net">
<link rel="preconnect" href="https://fonts.googleapis.com" crossorigin>
<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
<!-- === SECTION 8: FAVICON & APP ICONS === -->
<link rel="icon" type="image/x-icon" href="favicon.ico">
<link rel="apple-touch-icon" sizes="180x180" href="apple-touch-icon.png">
<link rel="icon" type="image/png" sizes="32x32" href="favicon-32x32.png">
<link rel="icon" type="image/png" sizes="16x16" href="favicon-16x16.png">
<!-- ENHANCED STYLES FOR MOBILE & DYNAMIC BACKGROUND -->
<style>
/* Override body background with dynamic colorful gradient */
body {
background: linear-gradient(135deg,
#667eea 0%,
#764ba2 15%,
#f093fb 30%,
#4facfe 45%, #FF9933 0%, /* Indian Saffron */
#FFFFFF 20%, /* White */
#138808 40%, /* Indian Green */
#4A90E2 60%, /* Sky Blue */
#9B59B6 80%, /* Purple */
#FF9933 100%); /* Back to Saffron */
background-size: 400% 400% !important;
animation: dynamicBackgroundShift 20s ease infinite !important;
min-height: 100vh !important;
position: relative !important;
overflow-x: hidden !important;n !important;
}
/* Add animated geometric shapes in background */
body::before {
content: '';
position: fixed;
top: -50%;
left: -50%;
width: 200%;
height: 200%;
background:
radial-gradient(circle at 20% 50%, rgba(255, 153, 51, 0.1) 0%, transparent 50%),
radial-gradient(circle at 80% 80%, rgba(19, 136, 8, 0.1) 0%, transparent 50%),
radial-gradient(circle at 40% 20%, rgba(255, 255, 255, 0.05) 0%, transparent 50%);
animation: backgroundShapes 30s ease-in-out infinite;
z-index: 0;
pointer-events: none;
}
/* Ensure content stays above background */
.container, header, .logo, h1, .search-box, .tools-grid, footer, .developer-section {
position: relative;
z-index: 1;
}
/* Dynamic background animation */
@keyframes dynamicBackgroundShift {
0% { background-position: 0% 50%; }
25% { background-position: 50% 100%; }
50% { background-position: 100% 50%; }
75% { background-position: 50% 0%; }
100% { background-position: 0% 50%; }
}
@keyframes backgroundShapes {
0%, 100% { transform: translate(0, 0) rotate(0deg); }
33% { transform: translate(30px, -30px) rotate(120deg); }
66% { transform: translate(-20px, 20px) rotate(240deg); }
}
/* Title animations */
@keyframes titlePulse {
0%, 100% { transform: scale(1); }
50% { transform: scale(1.05); }
}
@keyframes titleFloat {
0%, 100% { transform: translateY(0px); }
50% { transform: translateY(-10px); }
}
@keyframes letterBounce {
0%, 100% { transform: translateY(0px); }
50% { transform: translateY(-5px); }
}
@keyframes gentlePulse {
0%, 100% { transform: scale(1); opacity: 1; }
50% { transform: scale(1.02); opacity: 0.95; }
}
/* Reduce calculator card motion/animations */
.tool-card {
transition: transform 0.2s ease, box-shadow 0.2s ease !important;
}
.tool-card:hover {
transform: translateY(-3px) !important; /* Reduced from larger values */
box-shadow: 0 4px 15px rgba(0,0,0,0.15) !important;
}
/* ===== DARK MODE STYLES ===== */
body.dark-mode {
background: linear-gradient(135deg,
#2C1B47 0%, /* Deep Purple */
#1E3A5F 20%, /* Dark Blue */
#2D5F5D 40%, /* Dark Teal */
#4A1942 60%, /* Dark Magenta */
#2C1B47 80%, /* Back to Deep Purple */
#1E3A5F 100% /* Dark Blue */
) !important;
background-size: 400% 400% !important;
animation: dynamicBackgroundShift 20s ease infinite !important; color: #ffffff !important;
transition: all 0.5s ease;
}
body.dark-mode h1,
body.dark-mode h2,
body.dark-mode h3,
body.dark-mode p {
color: #ffffff !important;
}
body.dark-mode .tool-card {
background: rgba(30, 30, 50, 0.9) !important;
border: 1px solid rgba(255, 255, 255, 0.1) !important;
box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3) !important;
}
body.dark-mode .tool-card:hover {
background: rgba(40, 40, 60, 0.95) !important;
border-color: rgba(138, 43, 226, 0.5) !important;
transform: translateY(-5px);
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body.dark-mode input,
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background: rgba(40, 40, 60, 0.8) !important;
color: #ffffff !important;
border: 1px solid rgba(255, 255, 255, 0.2) !important;
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body.dark-mode .search-box {
background: rgba(30, 30, 50, 0.9) !important;
color: #ffffff !important;
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body.dark-mode .developer-section {
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body.dark-mode footer {
background: rgba(20, 20, 40, 0.9) !important;
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/* MOBILE RESPONSIVENESS IMPROVEMENTS */
@media screen and (max-width: 768px) {
/* Title responsive sizing */
h1 {
font-size: clamp(2rem, 10vw, 3.5rem) !important;
letter-spacing: clamp(1px, 0.3vw, 4px) !important;
padding: 10px !important;
margin: 15px 0 !important;
}
/* Logo responsive sizing */
.logo {
width: clamp(60px, 15vw, 100px) !important;
height: clamp(60px, 15vw, 100px) !important;
}
/* Search box mobile optimization */
.search-box {
width: 95% !important;
max-width: 100% !important;
margin: 15px auto !important;
padding: 12px 20px !important;
}
/* Calculator cards mobile grid */
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grid-template-columns: 1fr !important;
gap: 15px !important;
padding: 15px !important;
}
/* Tool cards mobile sizing */
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padding: 20px 15px !important;
margin: 0 !important;
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input, select, button {
font-size: 16px !important; /* Prevents zoom on iOS */
padding: 12px !important;
min-height: 44px !important; /* Touch target size */
}
/* Button mobile optimization */
button {
min-width: 120px !important;
padding: 12px 20px !important;
}
/* Footer mobile layout */
footer {
padding: 20px 10px !important;
}
/* Social buttons mobile */
.social-share a {
padding: 10px 15px !important;
font-size: 14px !important;
margin: 5px !important;
}
/* Developer section mobile */
.developer-section {
padding: 30px 15px !important;
margin-top: 30px !important;
}
/* Container padding mobile */
.container {
padding: 10px !important;
}
}
/* Tablet responsiveness */
@media screen and (min-width: 769px) and (max-width: 1024px) {
h1 {
font-size: clamp(3rem, 6vw, 4.5rem) !important;
}
.tools-grid {
grid-template-columns: repeat(2, 1fr) !important;
gap: 20px !important;
}
}
/* Small mobile devices */
@media screen and (max-width: 480px) {
h1 {
font-size: clamp(1.8rem, 12vw, 2.5rem) !important;
line-height: 1.3 !important;
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word-wrap: break-word !important;
overflow-wrap: break-word !important;
word-break: break-word !important;
max-width: 100% !important;
box-sizing: border-box !important;
}
/* Developer section specific text wrapping */
.developer-section, .developer-section * {
word-wrap: break-word !important;
overflow-wrap: break-word !important;
max-width: 100% !important;
}
.developer-section p {
font-size: 0.85rem !important;
line-height: 1.4 !important;
padding: 0 10px !important;
}
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.container, .tool-card, .tool-card * {
word-wrap: break-word !important;
overflow-wrap: break-word !important;
max-width: 100% !important;
}
.tool-card h3, .tool-card p {
font-size: 0.9rem !important;
padding: 5px !important;
}
.logo {
width: 70px !important;
height: 70px !important;
}
.tool-card {
padding: 15px 10px !important;
}
input, select {
padding: 10px !important;
}
}
/* Landscape mobile orientation */
@media screen and (max-height: 500px) and (orientation: landscape) {
h1 {
font-size: 2rem !important;
margin: 10px 0 !important;
}
.logo {
width: 60px !important;
height: 60px !important;
}
}
/* High contrast for better visibility */
@media (prefers-contrast: high) {
body {
background: linear-gradient(135deg, #000080, #4B0082, #8B008B) !important;
}
}
/* Reduced motion for accessibility */
@media (prefers-reduced-motion: reduce) {
*, *::before, *::after {
animation-duration: 0.01ms !important;
animation-iteration-count: 1 !important;
transition-duration: 0.01ms !important;
}
}
<
/* Extra small devices (phones, 320px and below) */
@media screen and (max-width: 320px) { /* Aggressive text wrapping for very small screens */ body, p, span, div, h1, h2, h3, h4, h5, h6 { word-wrap: break-word !important; overflow-wrap: break-word !important; word-break: break-word !important; hyphens: auto !important; }
h1 {
font-size: clamp(1.5rem, 10vw, 2.2rem) !important;
padding: 5px !important;
}
.developer-section p {
font-size: 0.75rem !important;
line-height: 1.3 !important;
padding: 5px !important;
}
.tool-card {
padding: 10px !important;
margin: 10px 5px !important;
}
.tool-card h3 {
font-size: 0.85rem !important;
}
.tool-card p {
font-size: 0.75rem !important;
}
.container {
padding: 5px !important;
}
}/style>
<!-- Open Graph / Facebook Meta Tags -->
<meta property="og:type" content="website">
<meta property="og:url" content="https://return7521-ui.github.io/studytools-india/">
<meta property="og:title" content="StudyTools India - 30+ Free Calculators for ISC, CBSE, JEE & NDA Students">
<meta property="og:description" content="Free online calculators for students - Percentage, CGPA, Age, BMI, Grade calculators. Study tools for JEE, NDA, ISC, CBSE students.">
<meta property="og:image" content="https://return7521-ui.github.io/studytools-india/og-image.png">
<!-- Twitter Card Meta Tags -->
<meta name="twitter:card" content="summary_large_image">
<meta name="twitter:url" content="https://return7521-ui.github.io/studytools-india/">
<meta name="twitter:title" content="StudyTools India - 30+ Free Calculators">
<meta name="twitter:description" content="Free online calculators for students - Percentage, CGPA, Age, BMI, Grade calculators.">
<meta name="twitter:image" content="https://return7521-ui.github.io/studytools-india/og-image.png">
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<title>StudyTools India - 30+ Free Calculators & Tools for Students</title>
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🌙🧮
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🔍
🎓
Convert CGPA to Percentage (ISC/CBSE)
Enter CGPA
CGPA Scale
Out of 10
Out of 4
Convert
🔄
Convert Percentage to CGPA
Enter Percentage
CGPA Scale
Out of 10
Out of 4
Convert
🧮
Calculate mean/average of numbers
Enter numbers (comma-separated)
Calculate Average
💰
Calculate Compound Interest
Principal (₹)
Rate (%)
Time (years)
Compound Frequency
Annually
Semi-annually
Quarterly
Monthly
Calculate
🟦
Calculate area of shapes
Shape
Circle
Rectangle
Triangle
Square
Radius/Side
Calculate Area
📦
Calculate volume of 3D shapes
Shape
Sphere
Cube
Cylinder
Cone
Radius/Side
Calculate Volume
🌡️
Convert between C, F, K
Temperature
From
Celsius
Fahrenheit
Kelvin
To
Fahrenheit
Celsius
Kelvin
Convert
📏
Convert between units
Length
From
Meter
Kilometer
Centimeter
Feet
Inch
Mile
To
Feet
Meter
Kilometer
Centimeter
Inch
Mile
Convert
⚖️
Convert between units
Weight
From
Kilogram
Gram
Pound
Ounce
To
Pound
Kilogram
Gram
Ounce
Convert
💻
Binary/Decimal/Hexadecimal
Enter Number
From
Decimal
Binary
Hexadecimal
Convert
🏷️
Calculate final price after discount
Original Price (₹)
Discount (%)
Calculate
500K+
Students Helped
30+
Free Tools
100%
Free Forever
<!-- CREATIVE DEVELOPER SECTION WITH MADE IN INDIA BRANDING -->
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${v} is ${p}% of ${t}`,true)} // CGPA to Percentage function calcCGPA(){const c=parseFloat(document.getElementById('cgpa-value').value);const s=parseFloat(document.getElementById('cgpa-scale').value);if(!c){showResult('cgpa-result','
Grade: ${g}`,true)} // Age Calculator function calcAge(){const d=document.getElementById('dob').value;if(!d){showResult('age-result','
💪 Keep pushing!`,true)} // BMI Calculator function calcBMI(){const h=parseFloat(document.getElementById('height').value);const w=parseFloat(document.getElementById('weight').value);if(!h||!w){showResult('bmi-result','
Category: ${cat}`,true)} // Grade Calculator function calcGrade(){const m=parseFloat(document.getElementById('marks').value);const t=parseFloat(document.getElementById('total-marks').value);if(!m||!t){showResult('grade-result','
${g}`,true)} // GPA Calculator function calcGPA(){const grades=document.getElementById('gpa-grades').value.toUpperCase().split(',').map(g=>g.trim());if(grades.length===0){showResult('gpa-result','
Based on ${count} grades`,true)} // Percentage to CGPA function calcPercToCGPA(){const p=parseFloat(document.getElementById('perc-to-cgpa-value').value);const s=parseFloat(document.getElementById('perc-to-cgpa-scale').value);if(!p){showResult('perc-to-cgpa-result','
${msg}`,p>=75)} // Average Calculator function calcAverage(){const nums=document.getElementById('avg-numbers').value.split(',').map(n=>parseFloat(n.trim())).filter(n=>!isNaN(n));if(nums.length===0){showResult('average-result','
Count: ${nums.length}`,true)} // Simple Interest function calcSimpleInterest(){const p=parseFloat(document.getElementById('si-principal').value);const r=parseFloat(document.getElementById('si-rate').value);const t=parseFloat(document.getElementById('si-time').value);if(!p||!r||!t){showResult('si-result','
Total: ₹${total}`,true)} // Compound Interest function calcCompoundInterest(){const p=parseFloat(document.getElementById('ci-principal').value);const r=parseFloat(document.getElementById('ci-rate').value);const t=parseFloat(document.getElementById('ci-time').value);const n=parseFloat(document.getElementById('ci-freq').value);if(!p||!r||!t){showResult('ci-result','
Total: ₹${a.toFixed(2)}`,true)} // Square Root function calcSquareRoot(){const n=parseFloat(document.getElementById('sqrt-num').value);if(!n||n<0){showResult('sqrt-result','
x₂ = ${x2}`,true)}} // Pythagorean Theorem function calcPythagorean(){const a=parseFloat(document.getElementById('pyth-a').value);const b=parseFloat(document.getElementById('pyth-b').value);if(!a||!b){showResult('pythagorean-result','
Bin: ${binary}
Hex: ${hex}`,true)}catch(e){showResult('binary-result','
Total: ₹${total}`,true)} // Time Duration Calculator function calcTimeDuration(){const start=document.getElementById('time-start').value;const end=document.getElementById('time-end').value;if(!start||!end){showResult('time-duration-result','
Median: ${median}
Range: ${range}`,true)} // Fraction Calculator function calcFraction(){const frac1=document.getElementById('frac1').value.split('/').map(n=>parseInt(n.trim()));const frac2=document.getElementById('frac2').value.split('/').map(n=>parseInt(n.trim()));const op=document.getElementById('frac-op').value;if(frac1.length!==2||frac2.length!==2){showResult('fraction-result','