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Math & Arithmetic Calculators
12 free calculators covering basic arithmetic through advanced number theory.
Online Math Calculators — Quick and Accurate
From simple addition to scientific functions and number theory, these free math tools handle calculations that would otherwise require a dedicated app or manual work. All tools run client-side in JavaScript, so results appear instantly as you type.
Highlights
- Basic Calculator — four operations plus memory storage, just like a desk calculator.
- Scientific Calculator — sin, cos, tan, log, powers, square roots, and constants like π and e.
- Percentage Calculator — find X% of Y, percentage change, and reverse percentages.
- Fraction Calculator — add, subtract, multiply, and divide fractions with automatic simplification.
- Prime Number Checker — instantly test whether any whole number is prime.
- GCD & LCM Calculator — greatest common divisor and least common multiple for two or more numbers.
- Average / Mean / Median / Mode — statistical measures for any dataset you enter.
Are these calculators accurate?
Yes. All tools use JavaScript's IEEE 754 double-precision floating-point arithmetic, which is accurate to 15–17 significant digits — more than sufficient for everyday calculations. For very large integers (factorial, GCD), BigInt is used where needed.
Do I need to install anything?
No. Every calculator runs entirely in your browser. No app download, no plugin, and no account is required.
Can I use these on mobile?
Yes. All tools are fully responsive and work on any smartphone or tablet with a modern browser.