Math & Units
Math calculators and unit converters — percentage, unit conversion, date calculator, and more.
Percentage Calculator
Calculate percentages instantly. Find X% of Y, what percent X is of Y, or percentage change.
Age Calculator
Calculate your exact age in years, months, and days. See your next birthday countdown.
Unit Converter
Convert between units of length, weight, and temperature. Instant, accurate, and free.
Date Difference Calculator
Calculate the difference between two dates in years, months, days, weeks, and hours.
Random Number Generator
Generate random numbers within a range. Supports bulk generation, unique numbers, and sorting.