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Time & Date Calculators

Free online time and date calculators. Convert time formats, calculate durations, work with dates, and more. All calculators include step-by-step formulas and reference tables.

Time Conversion Calculators

Convert between 24-hour and 12-hour formats, military time, decimal hours, HH:MM:SS, and more.

Date Calculators

Add or subtract days from a date, find days between dates, count weekdays, and more.

Time Arithmetic Calculators

Add hours or minutes to a time, add two durations, calculate averages, and convert between H:MM and decimal.

Age Calculators

Calculate your exact age in years, months, and days, or find the age difference between two people.

Other Time Calculators

Specialized calculators for download time estimation and more.


See also