How it works
Each row is a time duration in hours, minutes and seconds. Rows are combined with the operation you choose per row (+ or −). Seconds roll up into minutes and minutes into hours automatically — so 90 minutes correctly becomes 1h 30m.
FAQs
How do I add two time durations?
Enter each duration as hours, minutes and seconds, choose the + operation, and press Calculate. For example, 2h 30m + 1h 45m = 4h 15m.
Can I subtract time too?
Yes — select the − operation to subtract one duration from another, useful for elapsed-time and shift calculations.
Can I add more than two times?
Yes. Use the add-row button to total as many durations as you need — handy for timesheets and project hours.
Is this time calculator free?
Yes, 100% free with no signup. All calculations run in your browser.