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Popular: 🔢 Basic 🏠 Mortgage ⚖️ BMI 🎓 Grade 🎂 Age % Percentage 🔥 Calorie 🎲 Dice 📅 Date ⏱️ Stopwatch
🔢 Math 💰 Finance ❤️ Health 🎲 Other

🔢 Math Calculators

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Basic Calculator
Add, subtract, multiply, divide — the essential everyday calculator.
🔍 20.9M/mo →
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Percentage Calculator
What is X% of Y? Percentage change, percentage of total and more.
🔍 5M/mo →
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Scientific Calculator
Trig, logarithms, exponents, roots — full scientific functions.
🔍 High →
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Fraction Calculator
Add, subtract, multiply and divide fractions instantly.
🔍 Medium →

💰 Finance Calculators

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Mortgage Calculator
Monthly payments, amortization schedule, total interest paid.
🔍 10M/mo →
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Compound Interest
See how your money grows with compound interest over time.
🔍 1M/mo →

❤️ Health Calculators

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Popular
BMI Calculator
Calculate Body Mass Index. Check if you are underweight, normal or overweight.
🔍 5M/mo →
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Calorie Calculator
Daily calorie needs based on age, weight, height and activity level.
🔍 895K/mo →

🎲 Other Calculators

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Grade Calculator
Calculate your class grade from assignments and exams.
🔍 735K/mo →
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Popular
GPA Calculator
Calculate your GPA from grades and credit hours easily.
🔍 575K/mo →
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Popular
Dice Roller
Roll any dice — D4, D6, D8, D10, D12, D20. Multiple dice.
🔍 481K/mo →
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Age Calculator
Calculate exact age in years, months, days from date of birth.
🔍 374K/mo →
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Top
Date Calculator
Days between dates, add/subtract days, find past or future dates.
🔍 High →
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Top
Stopwatch & Timer
Online stopwatch and countdown timer — works on any device.
🔍 High →

💡 New: Basic Calculator is Live!

Our fastest, cleanest basic calculator — no clutter, no distractions. Just your answer.

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Why CalculatorAha.com?

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Lightning Fast
Pure JavaScript — no server needed. Results appear instantly as you type.
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Mobile First
Designed for thumbs. Every calculator works beautifully on your phone.
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No Clutter
Calculator front and centre. No pop-ups, no sign-ups, no distractions.
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Always Free
Every single calculator, forever free. No account needed.
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Explained Clearly
Every result comes with a simple explanation of how the math works.
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Works Everywhere
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