Time Decimal Calculator
Time to Decimal Calculator works out Hours (decimal) and Hours to the nearest hundredth (payroll) from Clock value and A value like 7:45 means. The default figures on this page give hours (decimal) of 7.750000 h; change any entry and the result, the working and the sources update together.
Your figures
Updates as you typeHow this is worked out
3 steps
- Input read as 7:45 read as h:mm, which is 27900 seconds.
- 27900 s / 60 = 465 min; / 3600 = 7.75 h; / 86400 = 0.322917 d.
- Splitting the total: 7 whole hours, 45 minutes and 0 seconds.
Its 6 worked examples are re-run on every release, last on 15 September 2026. What changed
Sources and references
3 sources
What the Time to Decimal Calculator calculates
Converts a length of time between clock form (h:mm:ss) and decimal hours, minutes, seconds and days, in either direction: 90 minutes is 1 hour 30 minutes and 1.5 decimal hours, and 7:45 on a timesheet is 7.75 hours. Conversions are the exact SI-accepted ones (1 h = 3600 s), and a two-part value such as 7:45 is read as hours and minutes or as minutes and seconds according to the chosen reading.
How to use this Time to Decimal Calculator
Enter Clock value and A value like 7:45 means. Hours (decimal) updates as you type. Change one figure at a time to see what drives the result.
How the result is worked out
Open “How this is worked out” beside the result for the step-by-step calculation behind Hours (decimal), Hours to the nearest hundredth (payroll) and Minutes.
The method follows BIPM, The International System of Units (SI Brochure), 9th edition, Table 8: non-SI units accepted for use with the SI, ISO 8601-1:2019, clause 5.5, representation of durations and of time of day and US Department of Labor, Wage and Hour Division Fact Sheet #21 (recordkeeping) and 29 CFR 785.48(b).
What you can compare
Change one input at a time to see how it affects Hours (decimal), Hours to the nearest hundredth (payroll) and Minutes. The inputs you can vary are Clock value and A value like 7:45 means.
Results are general information, not financial, tax, legal, medical or engineering advice. Check any decision that matters with a qualified professional.
See something wrong? Report a problem with this calculator
Frequently asked questions
How do I calculate time in decimals?
Converts a length of time between clock form (h:mm:ss) and decimal hours, minutes, seconds and days, in either direction: 90 minutes is 1 hour 30 minutes and 1.5 decimal hours, and 7:45 on a timesheet is 7.75 hours. Open “How this is worked out” beside the result to see each step for your own figures.
How to write 8 hours and 20 minutes in decimal?
It needs Clock value and A value like 7:45 means. Nothing else is required, and the figures stay in your browser.
How to write 7 hours and 45 minutes in decimal?
The result gives Hours (decimal), Hours to the nearest hundredth (payroll), Minutes, Seconds, Days and Whole hours, each labelled with its unit so the figure can be read on its own.
What information do I need for the Time to Decimal Calculator?
You need Clock value and A value like 7:45 means. The page opens with default figures that give hours (decimal) of 7.750000 h, so you can see the scale before entering your own.
What does this Time to Decimal Calculator show?
It shows Hours (decimal), Hours to the nearest hundredth (payroll), Minutes, Seconds, Days, Whole hours, Minutes left over and Seconds left over, with the working and any warnings for your entries.
Can I check how the Time to Decimal Calculator result was calculated?
Yes. The “How this is worked out” section shows the calculation steps, and the sources section identifies the references used for the method.