Time Calculator

Time Calculator handles the arithmetic that ordinary calculators make awkward: adding durations, subtracting one time from another, and converting between hours, minutes and seconds. Two or more spans of time can be entered and totalled, which is useful for adding up working hours across a week, or for working out the length of a series of tasks. Subtracting a start time from an end time gives the elapsed duration directly, including overnight spans. Results are shown in a readable form as well as in total minutes or seconds, so the answer can be copied into a timesheet or converted into another unit without a second step. The tool runs entirely in the browser with no account and no installation, and every calculation is done on the page, so it works the same on a desktop or a phone. It is a reference utility rather than a service: there is nothing to sign up for and no data to store.