Calculators & Converters

Convert Unix timestamps and date time

Calculate date arithmetic and day differences

A local calculator for arithmetic, decimals, percent, backspace and history

Convert length, weight, temperature and data size units

Calculate ratios, growth rates, discounts and changes

Estimate loan payments, interest and compound growth

Local calculator for trigonometry, logarithms, parentheses and powers

Calculate BMI and category in metric or imperial units

Calculate GPA from grades and credits

Calculate weighted grades or required final scores

Convert date time between IANA time zones

Calculate age and elapsed days from a birth date

Calculate tip, total and per-person amount from bill, rate and people

Generate one or more random integers within a range

Convert between decimal numbers and Roman numerals