Simple time conversions.
Clearly explained.
Time to Decimal Calculator helps you move between hours, minutes, seconds, and decimal hours, without an account.
Built for everyday durations
Whether you are filling in a timesheet, tracking a project, or checking a duration, these three tools let you convert a value and copy the result:
- Time to decimal converts an HH:MM or HH:MM:SS duration to decimal hours.
- Minutes to decimal divides total minutes by 60.
- Decimal to time turns decimal hours into hours, minutes, and seconds.
How the numbers work
An hour contains 60 minutes or 3,600 seconds. Time and minute inputs are converted using these relationships; decimal hours are multiplied by 3,600 and rounded to the nearest second before splitting into hours, minutes, and seconds.
The calculators use integer and fraction arithmetic to avoid floating-point rounding errors. Decimal results round half up to your selected 2, 4, or 6 places. The reference tables use the same calculation functions as the tools.
These tools provide numerical conversions. Follow your own timesheet system’s requirements for recorded precision and time rounding.
Private by design
Your input is processed in your browser. It is not uploaded, saved in browser storage, or added to the page URL. There are no advertising or third-party analytics scripts. Read the privacy policy for information about hosting logs and email contact.
Contact & report an error
A public contact email has not been published yet. The formulas and worked examples above explain how to check a result independently.