Math Calculators
Fast & Accurate
Percentage, fractions, statistics, algebra — solve everyday math problems instantly. All calculations run privately in your browser.
Percentage Calculator
Calculate X% of Y, find what percent X is of Y, or percent change.
Percentage Change Calculator
Find absolute and percentage change between two values.
Average Calculator
Mean, median, mode, sum, min, max, and standard deviation from a list.
Fraction Calculator
Add, subtract, multiply, and divide fractions. Simplified results.
Ratio Calculator
Simplify ratios and split a total proportionally between two values.
Random Number Generator
Generate random integers in a range. Optional unique numbers.
Factorial Calculator
Calculate n! for any non-negative integer up to 170.
GCD & LCM Calculator
Find greatest common divisor and least common multiple of two numbers.
Prime Number Checker
Check if a number is prime and list all divisors.
Standard Deviation Calculator
Sample or population standard deviation and variance from data.
Quadratic Equation Solver
Solve ax² + bx + c = 0. Real and complex roots with discriminant.
Logarithm Calculator
Calculate log with any base plus ln, log₁₀, and log₂.