Time Calculator
Add, subtract, multiply, or divide durations, or find the time between two dates.
Updates live as you type. A negative result (from subtracting a larger time) is shown with a leading minus sign. Runs entirely in your browser.
What is Time Calculator?
Do duration math without reaching for a calculator: add or subtract two durations (hours, minutes, seconds), multiply or divide a single duration by a number, or find the elapsed time between two dates and times — pick the operation from the dropdown and the result updates instantly. Results over 24 hours roll into a day count automatically, so a long total reads as, say, "2d 3h 15m 0s" rather than an unwieldy hour count. This covers the common duration-math cases developers and project planners run into: totaling work hours or video/audio clip lengths (add/subtract), scaling an estimate by a multiplier (multiply/divide), or measuring exactly how long between two timestamps (between two dates). Everything runs entirely in your browser; nothing you enter is sent to a server.
FAQ
Subtracting a larger duration from a smaller one shows the result with a leading minus sign.
Yes — switch the operation dropdown to "Multiply a time by a number" or "Divide a time by a number" to scale a single duration by any factor.
Select "Time between two dates" from the operation dropdown, then pick a From and To date/time — the result shows the elapsed duration between them.