Hours & Minutes Calculator
Use our free Hours & Minutes Calculator to add, subtract, and convert hours and minutes.
Quickly calculate total time for work, projects, timesheets, and other tasks.
Hours and minutes are two units used to measure time, with 60 minutes in one hour. This calculator adds and subtracts durations and converts the total into decimal hours and total minutes; an hourly rate can then turn that total into a billable amount.
How to Calculate Hours and Minutes
There are 60 minutes in one hour, so hours and minutes need to be calculated separately when adding or subtracting time.
For example, to add 2 hours 45 minutes and 1 hour 30 minutes:
2 hours + 1 hour = 3 hours
45 minutes + 30 minutes = 75 minutes
Since 75 minutes equals 1 hour and 15 minutes:
3 hours + 1 hour 15 minutes = 4 hours 15 minutes
So the total is 4 hours 15 minutes.
When subtracting time, you may need to convert one hour into 60 minutes first.
For example:
5 hours 20 minutes − 2 hours 45 minutes
Convert 5 hours 20 minutes to 4 hours 80 minutes, then subtract:
4 hours 80 minutes − 2 hours 45 minutes = 2 hours 35 minutes
You can use the calculator to handle these calculations without manually converting between hours and minutes.
Convert Hours and Minutes
You can convert hours and minutes into total minutes or decimal hours depending on how you need to use the result.
Hours to Minutes
Multiply the number of hours by 60.
3 hours × 60 = 180 minutes
Minutes to Hours
Divide the number of minutes by 60.
150 minutes ÷ 60 = 2.5 hours
This means 150 minutes = 2 hours 30 minutes.
Hours and Minutes to Decimal Hours
Decimal hours are commonly used for timesheets and hourly billing. Divide the minutes by 60 to convert them into a decimal.
For example:
30 minutes ÷ 60 = 0.5
Therefore
2 hours 30 minutes = 2.5 hours
This format can be useful when calculating an hourly charge. For example, 2.5 hours at $40 per hour equals $100.
Convert Hours and Minutes to Money
You can turn a total into an amount once a rate is entered. Here is how each step works.
- Hours & minutes
- 2h 45m
- Decimal hours
- 2.75
2.75 × $30 = $82.50
Amount = (Hours + Minutes ÷ 60) × Rate
Example:
2 hours 45 minutes at $30 per hour.
45 ÷ 60 = 0.75 → 2.75 hours
The minutes are never turned into money on their own — they only weight the hourly rate. That is why converting to decimal hours first removes almost every disagreement about a bill.
Add several durations and the calculator does the same multiplication on the combined total, so the amount always matches the hours shown above it.
Frequently Asked Questions
How many minutes are in one hour?
A: There are 60 minutes in one hour.
How do I convert 90 minutes into hours?
A: 90 minutes equals 1 hour 30 minutes, or 1.5 hours in decimal format.
How do I convert 2 hours 15 minutes to decimal hours?
A: Divide 15 minutes by 60:
15 ÷ 60 = 0.25
So 2 hours 15 minutes = 2.25 hours.
How do I calculate total work hours?
A: Subtract the start time from the end time, then subtract any unpaid breaks. For example, working from 9:00 AM to 5:00 PM with a 1-hour break gives you 7 hours of working time.
Can I use hours and minutes for invoice billing?
A: Yes. If you bill by the hour, convert your total time into decimal hours and multiply it by your hourly rate. For example, 3 hours 30 minutes equals 3.5 hours.