🔢 Math & Numbers
Everyday number crunching without the manual arithmetic — work with fractions, averages and statistics, percentages, factors and roots. Each tool shows the result clearly and runs instantly in your browser.
Percentage Difference Calculator
Find the percentage difference and percentage change between two numbers.
Decimal to Fraction
Convert a decimal to a fraction in lowest terms — and fractions back to decimals.
Fraction Calculator
Add, subtract, multiply and divide fractions, reduced to lowest terms.
Mean, Median, Mode Calculator
Get mean, median, mode, range and standard deviation from a list of numbers.
LCM & GCD Calculator
Find the least common multiple and greatest common divisor of any numbers.
Prime Number Checker
Check if a number is prime, with its factors and the nearest primes.
Square Root Calculator
Find the square root, cube root and any nth root of a number.
Rounding Calculator
Round numbers to decimals, significant figures or the nearest 10/100/1000.
Exponent Calculator
Raise any base to any power, including negative and fractional exponents.
Scientific Notation Converter
Convert between standard numbers and scientific notation (a × 10ⁿ).
Factorial Calculator
Compute n! exactly, even for large numbers, with big-integer math.
Modulo Calculator
Find the remainder (a mod b), with both truncated and floored conventions.