# Math Calculators

- **URL:** https://codeasystem.com/calculators/math/
- **Markdown index:** https://codeasystem.com/calculators/math/index.md
- **Calculators in this category:** 9

Math calculators for percentages, percentage change, fractions, ratios, quadratic equations, factorials and more.

Focus areas: Percentages, fractions, ratios and algebra.

## All calculators
- [Percentage Calculator](https://codeasystem.com/calculators/math/percentage-calculator.md); Solve all three classic percentage questions; percent of a number, percent-of-total, and percentage change; in one switchable tool.
- [Percentage Change Calculator](https://codeasystem.com/calculators/math/percentage-change-calculator.md); Compute the signed percentage increase or decrease between two values, with the absolute difference and multiplier shown alongside.
- [Decimal to Fraction Calculator](https://codeasystem.com/calculators/math/decimal-to-fraction-calculator.md); Convert any decimal into its simplest fraction using continued fractions, with mixed-number output and honest notes when only an approximation exists.
- [Ratio Calculator](https://codeasystem.com/calculators/math/ratio-calculator.md); Simplify any two-term ratio to lowest terms or solve the missing fourth term of a proportion a:b = c:d.
- [Quadratic Equation Calculator](https://codeasystem.com/calculators/math/quadratic-equation-calculator.md); Solve ax² + bx + c = 0 for real or complex roots, showing the discriminant and vertex so the answer never arrives unexplained.
- [GCD & LCM Calculator](https://codeasystem.com/calculators/math/gcd-lcm-calculator.md); Find the greatest common divisor of two integers with Euclid’s algorithm, plus the least common multiple derived from it.
- [Factorial Calculator](https://codeasystem.com/calculators/math/factorial-calculator.md); Compute n! for any whole number from 0 to 170, with digit counts and scientific magnitude shown for the huge results.
- [Random Number Generator](https://codeasystem.com/calculators/math/random-number-generator.md); Draw one to one hundred random integers within any range, optionally requiring unique picks, sorted for readability.
- [Exponent & Root Calculator](https://codeasystem.com/calculators/math/exponent-root-calculator.md); Raise any base to any power; including fractional exponents for square and cube roots; with friendly handling of complex results.

Each link above points to the full Markdown reference for that calculator (inputs, formula, worked example, FAQs). The interactive HTML version lives at the same path without the `.md` suffix.

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Last updated: 2026-08-23 · [Section overview](https://codeasystem.com/calculators/index.md)