Time Calculator
Add or subtract hours, minutes and seconds.
Result
Results are estimates for general information only and are not professional advice.
Adding and subtracting time
This calculator adds or subtracts two durations given in hours, minutes and seconds, and returns the result normalised into hours, minutes and seconds — handy for schedules, cooking and time tracking.
Frequently Asked Questions
What is the Time Calculator?
Add or subtract hours, minutes and seconds. It runs instantly in your browser and is completely free to use.
What do I need to enter to use the Time Calculator?
The Time Calculator asks for the following values (7): Hours 1, Minutes 1, Seconds 1, Operation, Hours 2, Minutes 2, Seconds 2. Fill them in and the result appears immediately — the calculation runs on your own device, so nothing you type is sent to a server.
How accurate is the Time Calculator?
The Time Calculator uses standard, widely-accepted formulas, so its figures are reliable estimates for everyday planning. They are not a substitute for advice from a qualified professional.
Is the Time Calculator free, and do I need an account?
Yes. The Time Calculator — and every other calculator on Calculatis — is completely free, with no registration, no download and no limit on how often you use it.