Time Calculator
Duration between times, and add or subtract time
Duration between two times
Add or subtract time
Free Online Time Calculator
Hours between two times, plus add or subtract hours and minutes
This free time calculator does the two things clocks make surprisingly fiddly: it tells you the exact duration between two times — in hours and minutes, even when the span runs past midnight — and it adds or subtracts a number of hours and minutes from any time to give you the resulting clock time. Perfect for working out shift length and hours worked, cooking and travel timings, or 'what time will it be in 5 hours 30 minutes?'. Everything runs in your browser, your entries are remembered on this device, and it works on phone, tablet and desktop.
Features
Time Between Times
Exact hours and minutes from a start time to an end time.
Overnight Aware
Correctly handles spans that cross midnight, like night shifts.
Add & Subtract
Add or subtract hours and minutes to get a resulting clock time.
100% Private
All calculations run in your browser; nothing is uploaded.
What People Use It For
Duration between times
- Shift length and hours worked
- How long a task or meeting took
- Cooking, workout or study timing
- Travel and layover durations
Add / subtract time
- "What time in 5h 30m?"
- Deadline from a start time
- Backwards from an arrival time
- Alarm or reminder offsets
Frequently Asked Questions
How do I calculate hours between two times?
Enter a start time and an end time — the calculator instantly shows the duration in hours and minutes, including spans that cross midnight.
Does it handle overnight times?
Yes. If the end time is earlier than the start time, it assumes the span crosses midnight (e.g. a 22:00–06:00 night shift is 8 hours) and notes it.
Can I add or subtract time?
Yes. In the second section, enter a start time, choose add or subtract, and enter hours and minutes to get the resulting clock time — it also shows if the result rolls into the next or previous day.
Is the result in decimal or hours and minutes?
Durations are shown in hours and minutes (e.g. 7 h 45 min), which is what timesheets and schedules usually need.
Is it free?
Yes — completely free, no sign-up, and it works in your browser on any device.