Free Online Calculators

Calculate dates, percentages, time zones, and unit conversions with focused browser tools.

AC Calculator

Age Calculator

Enter a date of birth to calculate exact age in years, months, and days. Check age on any date and see total days, weeks, or months with no login required.

PC Calculator

Percentage Calculator

Calculate a percentage of a number, find what percent one value is of another, and work out percentage increase, decrease, change, or reverse values instantly.

TZ Calculator

Time Zone Converter

Convert a date and time between common time zones and see the selected UTC offsets. The tool also flags day changes and daylight-saving times that are invalid or ambiguous.

UC Calculator

Unit Converter

Convert metric and imperial length, weight, temperature, and US volume units online. See the formula and equivalent values instantly without registration.

LC Calculator

Length Converter

Convert meters, feet, inches, centimeters, kilometers, miles, and more. See the formula and equivalent values for dimensions, heights, and distances with no login.