Hours and minutes → decimal
d = h + m / 60
Convert hours and minutes to decimal hours (and decimal hours back to hours and minutes)
Instantly convert an HH:MM duration to decimal hours, hundredths and total minutes, or turn decimal hours back into hours and minutes.
- Clipboard
Example: 7 h 30 = 7.50 h. Thirty minutes is 0.50 hour, not 0.30.
Example: 7.50 h = 7 h 30. Multiply the decimal part by 60.
Result
- Hours and minutes
- Decimal value
- Hundredths of an hour
- Total minutes
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How does this tool work?
Time is usually read in hours and minutes, while timesheets, time-tracking software, payroll calculations and billing often use decimal hours. These formats use different bases: an hour has 60 minutes, while a decimal value is divided into hundredths. This converter switches between them without manual arithmetic and displays several equivalents so the result is easy to verify.
To convert a duration to decimal hours, divide the minutes by 60 and add that fraction to the hours. Thus 7 h 30 becomes 7 + 30 ÷ 60 = 7.50 h. In reverse, keep the integer part as hours and multiply the decimal part by 60 to recover minutes. For example, 7.75 h is 7 h 45. Total minutes and hundredths are also displayed to make the relationship clear.
How to use this tool
Choose direction
Select decimal or hours-and-minutes conversion.
Enter duration
Enter hours and minutes, or the decimal value.
Read equivalents
Compare HH:MM, decimal hours, hundredths and total minutes.
Use the result
Copy the value you need and apply the precision or rounding required by your context.
Conversion formulas
Decimal hours count in hundredths of an hour, minutes in sixtieths.
Decimal → hours and minutes
h = ⌊d⌋; m = (d − ⌊d⌋) × 60
Hundredths of an hour
c = d × 100
One hundredth of an hour lasts 36 seconds.
- h
- whole hours
- m
- minutes (0 to 59)
- d
- duration in decimal hours
- c
- duration in hundredths of an hour
Use cases
Timesheets and hour tracking
Convert hours and minutes to decimal values that are easier to total in spreadsheets, activity reports or time-tracking software.
Payroll and working time
Convert a duration before applying an hourly rate or checking a time record. Payroll rules, premiums and rounding remain separate.
Time-based billing
Turn 2 h 15, 3 h 30 or 6 h 45 into 2.25 h, 3.50 h or 6.75 h before applying an hourly rate.
Spreadsheets and data
Normalize durations as decimal numbers before calculating totals, averages or other numerical results.
Conversion checks
View hours/minutes, decimal hours, hundredths and total minutes together to spot mistakes.
Examples
A working day
30 ÷ 60 = 0.5, so 7.5 hours.
Input
7 h 30Result
7.50 h · 750 hundredths · 450 minA time-clock value
0.75 × 60 = 45 minutes.
Input
6.75 hResult
6 h 45A third of an hour
20 ÷ 60 = 0.3333…; invoices often round to 8.33 h.
Input
8 h 20Result
8.3333 hTips and best practices
- Do not simply replace the separator with a decimal point: 7 h 30 is 7.50 h, not 7.30 h.
- Useful checkpoints: 15 min = 0.25 h, 30 min = 0.50 h and 45 min = 0.75 h.
- To convert minutes to decimal hours, always divide by 60: 20 min ÷ 60 ≈ 0.3333 h.
- Keep extra decimal places during intermediate calculations and round only when required.
- For payroll or billing, follow the rounding rule required by your organisation, agreement, client or software.
- Hundredths of an hour are not minutes: 25 hundredths = 0.25 h = 15 minutes.
Sources and references
- BIPM — SI Brochure: units of time (opens in a new tab)Page in English
Frequently asked questions
Is 7 h 30 the same as 7.30 h?
No. An hour has 60 minutes. Thirty minutes is 30 ÷ 60 = 0.50 hour, so 7 h 30 = 7.50 h.
How do I convert hours and minutes to decimal hours?
Keep the hours, divide minutes by 60 and add both values. For example, 8 h 20 ≈ 8.3333 h.
How do I convert decimal hours back to hours and minutes?
Keep the integer part as hours and multiply the decimal part by 60. Thus 6.75 h = 6 h 45.
What is the difference between minutes and hundredths?
Minutes use base 60; hundredths use base 100. Thirty minutes = 0.50 h = 50 hundredths.
What are common minute-to-decimal values?
10 min ≈ 0.1667 h; 15 min = 0.25 h; 20 min ≈ 0.3333 h; 30 min = 0.50 h; 45 min = 0.75 h.
Can I use decimal hours for payroll or billing?
Yes for converting duration before applying an hourly rate. Payroll premiums, contributions and special rules are not calculated here.
Should decimal hours be rounded?
It depends on the use. Keep precision during calculations and apply the rounding rule required by the destination system.
Are my values sent to a server?
No. Conversion runs locally in your browser.
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