Math Calculators & Tools

Free online math tools for percentage calculations, prime number checking, LCM/HCF, fractions, square roots, and standard deviation.

Popular Tools in Math

Percentage Increase/Decrease Calculator - The percentage change between two numbers.
Average Calculator - Mean, median and mode of a list of numbers.
Ratio Calculator - Simplify a ratio or solve for a missing value.
LCM & HCF Calculator - Least common multiple and highest common factor of numbers.
Fraction Calculator - Add, subtract, multiply and divide fractions with steps shown.
Square Root & Cube Root Calculator - Square and cube roots, including non-perfect squares.
Standard Deviation Calculator - Mean, variance and standard deviation of a data set.
Scientific Calculator - Trig, logs, exponents and more, in one keypad.
Percentage to Fraction/Decimal Converter - Convert between percentages, fractions and decimals.
Prime Number Checker - Check if a number is prime and list factors if not.
Factorial Calculator - Factorial of any non-negative integer.
Permutation & Combination Calculator - nPr and nCr for a given set size and selection size.
Quadratic Equation Solver - Roots of ax² + bx + c = 0, real or complex.
Number to Words Converter - Spell out a number in words, useful for cheques and forms.
Exponent & Power Calculator - Calculate base numbers raised to positive or negative exponents.
Ratio to Percentage Calculator - Convert any ratio A:B into percentage share values and proportions.
Percentage Error Calculator - Calculate percent error and absolute error between experimental measured and theoretical true values.