Math
Percentage, Age, Fraction, Standard Deviation, Average and more
Percentage Calculator
Find X percent of Y, what percent one number is of another, and percentage increase or decrease. Free calculator for discounts, tips and tax.
Age Calculator
Enter your date of birth to get your exact age in years, months and days, plus total days lived and days until your next birthday. Free and online.
Random Number Generator
Pick random numbers in any min-to-max range. Choose integers or decimals, set how many, and allow duplicates or unique sets. Free RNG, no signup.
Fraction Calculator
Add, subtract, multiply and divide fractions instantly. Enter numerators and denominators to get the simplified result, mixed number and decimal.
Standard Deviation
Calculate standard deviation, variance and mean for any data set with both population and sample formulas. Free statistics calculator online.
Exponent Calculator
Enter a base and exponent to calculate powers instantly, including negative and fractional exponents. Free online power calculator.
Logarithm Calculator
Calculate logarithms with any base, including log base 10 and natural log (ln), using the change-of-base formula. Free logarithm calculator.
Square Root Calculator
Calculate square roots, cube roots and nth roots instantly, and simplify radicals into exact form. Free root calculator for math and geometry.
Ratio Calculator
Simplify ratios to lowest terms, solve a:b = c:x proportions and find missing values. Free ratio and proportion calculator for recipes and scale.
Average Calculator
Find the mean, median and mode of a data set in one step. Geometric, harmonic and weighted averages supported — enter numbers separated by commas.
Prime Number Checker
Check whether a number is prime, see its full prime factorization and list every prime in a range. Free online prime number checker.
GCD & LCM Calculator
Find the greatest common divisor (GCD) and least common multiple (LCM) of two or more integers, with Euclidean and prime factorization steps.
Trigonometry Calculator
Calculate sin, cos, tan and inverse trig functions in degrees or radians, with a trig table reference. Free trigonometry calculator.
Matrix Calculator
Perform matrix addition, multiplication, inverse, determinant, and transpose operations. Supports up to 10x10 matrices. Free online matrix calculator.
Scientific Notation
Convert numbers to and from scientific notation (a × 10ⁿ), E-notation and engineering notation. Free converter for very large or tiny values.