Add Time Calculator
Add hours and minutes to a start time.
What time will it be?
Adding a duration to a start time — for an arrival, a timer, or a schedule — is easy to get wrong when it crosses the hour or the day. This calculator does it cleanly.
Starting at 14:00 and adding 2 hours 45 minutes gives 16:45. Add enough and it rolls into the next day and tells you so; use negative values to count backward.
Simple and private
The calculation runs in your browser, so nothing you enter is uploaded.
Frequently Asked Questions
What does it do?
It adds a number of hours and minutes to a start time and shows the resulting clock time, noting if it rolls to the next day.
Can I subtract?
Enter negative hours or minutes to move the time earlier.
What is it useful for?
Estimating arrival times, cooking finish times, and scheduling from a fixed start.
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