What are decimal hours?
Decimal hours express time as a base-10 number instead of separate hours and minutes. One hour contains 60 minutes, so the minute portion must be divided by 60 before it can be added to the whole-hour value.
For example, 8 hours 30 minutes is 8.50 decimal hours because 30 ÷ 60 equals 0.50. Likewise, 8 hours 15 minutes equals 8.25 hours and 8 hours 45 minutes equals 8.75 hours.
How to convert hours and minutes to decimal hours
Enter the whole number of hours and a minute value from 0 through 59. The calculator converts the minutes into a fraction of an hour and adds that amount to the entered hours.
You can display the result to two, three or four decimal places. The calculator also shows the unrounded conversion so you can distinguish the exact calculation from the rounded display value.
How to convert decimal hours to hours and minutes
To convert the other direction, multiply the decimal-hour value by 60 to find the total number of minutes. The calculator then divides those minutes into complete hours and the remaining minutes.
For example, 7.75 decimal hours equals 465 minutes. That converts back to 7 hours and 45 minutes.
A decimal value such as 8.30 does not mean 8 hours 30 minutes. Instead, 0.30 of an hour equals 18 minutes because 0.30 × 60 = 18.
Common minutes to decimal hours
Some frequently used conversions are 5 minutes = 0.0833 hours, 10 minutes = 0.1667 hours, 15 minutes = 0.25 hours, 20 minutes = 0.3333 hours, 30 minutes = 0.50 hours and 45 minutes = 0.75 hours.
Decimal hours for payroll and timesheets
Decimal hours are commonly useful when work time needs to be entered into payroll, invoicing or timesheet systems that expect a decimal quantity instead of an hours-and-minutes format.
This calculator performs the time conversion only. Workplace rules can use specific rounding increments, break policies or overtime rules, so those policies should be applied separately when preparing an official payroll record.
Decimal Hours Calculator vs. Work Hours Calculator
Use this calculator when you already know the amount of time and only need to convert its format. Use the Work Hours Calculator when you need to calculate the duration between a start time and an end time first.
For several daily clock-in and clock-out entries, the Time Card Calculator totals the weekly work time and also reports decimal hours.
Frequently asked questions
What is 30 minutes in decimal hours?
30 minutes is 0.50 decimal hours because 30 divided by 60 equals 0.5.
What is 15 minutes in decimal hours?
15 minutes is 0.25 hours.
What is 45 minutes in decimal hours?
45 minutes is 0.75 hours.
Is 8.30 hours the same as 8 hours 30 minutes?
No. 8.30 decimal hours equals 8 hours 18 minutes. Eight hours 30 minutes equals 8.50 decimal hours.
Why does the calculator round minutes?
When converting decimal hours back to ordinary time, the display uses the nearest whole minute. The exact converted total-minute value is also shown.
Using this calculator effectively
The Decimal Hours Calculator converts ordinary hours and minutes into decimal hours and converts decimal-hour values back into hours and minutes. It is useful when time needs to be entered in a decimal format for timesheets, payroll or invoicing.
Common uses
- Converting an hours-and-minutes duration into decimal hours.
- Turning a decimal-hour value back into ordinary hours and minutes.
- Checking common time conversions before entering hours into a timesheet or payroll system.
Tips for a better estimate
- Enter minute values from 0 through 59 when converting hours and minutes to decimal hours.
- Remember that a decimal such as 0.30 of an hour equals 18 minutes, not 30 minutes.
- Apply employer-specific payroll rounding or overtime rules separately from the raw time conversion.
Related calculations
Time Card Calculator · Time Duration Calculator · Work Hours Calculator