Add Hours and Minutes
Add a list of HH:MM durations to get a clean total and, optionally, the finishing clock time from a chosen start.
4 h 30 min
- 1
Total minutes
90 + 45 + 135 = 270 - 2
Total time in hours
270 ÷ 60 = 4.50
How does this calculator work?
To add hours and minutes, convert each HH:MM duration to minutes (h·60 + m), sum them, then split the total back: hours are the total minutes divided by 60 (rounded down) and minutes are the remainder. Optionally add the total to a start time, wrapping within a 24-hour day, to get the end clock time.
Formula
How this is calculated
Enter one duration per line in hours:minutes form (for example 1:30 for ninety minutes). Each line is converted to minutes with h·60 + m, and all the minute values are summed into totalMin. Commas and semicolons also work as separators, so you can paste durations on a single line if you prefer.
The total is split back into hours and minutes: the whole hours are floor(totalMin / 60) and the leftover minutes are totalMin mod 60. The same total is also shown as a plain minute count and as a decimal number of hours (totalMin / 60) for use in timesheets and billing.
If you supply a start clock time, the calculator adds the total to that time and wraps it within a 24-hour day using (startMin + totalMin) mod 1440, so an evening start that runs past midnight returns the correct morning time. A single number with no colon is read as whole hours, and any negative or non-numeric entry is rejected.
Frequently asked questions
Type each duration as hours:minutes, one per line, such as 2:45. You can also separate them with commas. Minutes above 59 are allowed and roll into hours in the total.
The start time is optional. When provided, the calculator adds the summed duration to it and shows the resulting clock time, wrapping past midnight within a 24-hour day.
Timesheets and invoices often need hours as a decimal. The hero shows totalMin divided by 60, so 1:30 becomes 1.50 hours.
Also known as
TG we-Calculate Editorial Team. (2026). Add Hours and Minutes [Online calculator]. TG we-Calculate. https://we-calculate.com/calculator/add-hours-and-minutes
TG we-Calculate Editorial Team. "Add Hours and Minutes." TG we-Calculate. 2026. https://we-calculate.com/calculator/add-hours-and-minutes.
TG we-Calculate Editorial Team, "Add Hours and Minutes," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/calculator/add-hours-and-minutes
@misc{wecalculate_add_hours_and_minutes, title = {Add Hours and Minutes}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/calculator/add-hours-and-minutes}}, year = {2026}, note = {TG we-Calculate} }
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