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Time Calculator: add and total time durations
Add up several durations, or add a duration to a clock time to find the resulting time.
Total duration
1h 30m
Your data never leaves this browser.
Why use this Time Calculator?
- Two practical modes. Add up durations or project when an activity ends.
- Overnight detection. The result flags itself automatically when it falls on the next day.
- Private by design. Every calculation runs in your browser.
How to calculate a time duration
- Pick Add durations or Add to clock time.
- Fill in the hour/minute fields.
- Watch the result appear below.
When you need this calculator
The combined length of several videos or recordings to be merged needs adding up first.
A trip or flight's arrival time, from departure plus travel duration, needs estimating.
A wake-up time after sleeping a set number of hours from now, or a cooking finish time from a start time plus a recipe's duration, gets a quick answer here.
Frequently asked questions
What's the difference between the two modes?+–
Add durations sums several durations into one total, like 1 hour 30 minutes plus 2 hours 45 minutes. Add to clock time adds one duration to a specific time to get a resulting time, like 09:00 plus 3 hours 15 minutes equals 12:15.
What does +1 day mean in the Add to clock time result?+–
It means the calculation crosses midnight and lands on the next day.
Can I add more than 2 durations?+–
Yes. Click + Add duration to add as many duration rows as needed.
Is my time data stored anywhere?+–
No. Every calculation runs in your browser.