Hours and Minutes Calculator
Add or subtract two lengths of time. Enter hours and minutes, pick the operation, and read the total in hours, minutes and decimal form.
How do you add hours and minutes together?
Add the minutes first. Every 60 minutes becomes one hour, then add the hours. For example 2 hr 45 min plus 1 hr 30 min gives 75 minutes, which is 1 hr 15 min, so the total is 4 hr 15 min. The calculator below does the carrying for you, including subtraction.
Your result will appear here after you press Calculate.
Why time uses 60 minutes to the hour
Clock time is base 60, inherited from Babylonian counting. That is why 1.5 hours is 1 hr 30 min and not 1 hr 50 min. Ordinary decimal addition gives the wrong answer unless you carry at 60 rather than at 100.
Adding durations
Add the minutes, carry each full 60 into the hours column, then add the hours.
3 hr 50 min + 2 hr 40 min: 50 + 40 = 90 minutes, which is 1 hr 30 min. 3 + 2 + 1 = 6, so the total is 6 hr 30 min.
Subtracting durations
If the minutes you are subtracting are larger, borrow one hour and add 60 minutes before subtracting.
5 hr 10 min - 1 hr 45 min: borrow an hour to make it 4 hr 70 min, then 70 - 45 = 25 and 4 - 1 = 3, so the answer is 3 hr 25 min.
Related tools
Frequently asked questions
How do I add minutes over 60?
Can the result be negative?
Is this the same as a time duration calculator?
Can I go over 24 hours?
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Calcadian calculators are for general planning and informational use. Please verify critical deadlines, legal, payroll, tax, HR, or official requirements with the relevant authorities or a qualified professional.