Timesheets and payroll systems often need decimal hours, but clocks show hours and minutes. 15 minutes is 0.25 h, 30 minutes 0.5 h and 45 minutes 0.75 h. A common mistake is writing 7 h 30 min as 7.3 hours.
How to use the Time to Decimal Calculator
- Hours
- Minutes
- Seconds
- Decimal hours to convert back
Results update as you type, and every field accepts the units shown in its menu.
How it works
Enter hours, minutes and seconds to convert to decimal, or enter decimal hours to convert back.
Minutes to decimal hours
| Minutes | Decimal | Minutes | Decimal |
|---|---|---|---|
| 0 | 0.00 | 30 | 0.50 |
| 5 | 0.08 | 35 | 0.58 |
| 10 | 0.17 | 40 | 0.67 |
| 15 | 0.25 | 45 | 0.75 |
| 20 | 0.33 | 50 | 0.83 |
| 25 | 0.42 | 55 | 0.92 |
Tips
- Check whether the end date should be included – event durations usually include it, elapsed time does not.
- Months have 28–31 days, so “one month” is counted by calendar date, not as 30 days.
- Use 24-hour time or set AM/PM carefully when entering clock times.
- Time zones and daylight-saving changes are not applied unless the calculator says so.
Common mistakes to avoid
- Counting a 30-day month when a calendar month is meant (or the reverse).
- Forgetting leap years when counting days across February.
- Mixing decimal hours (7.5 h) with clock time (7:30).
Inputs explained
| Field | What to enter |
|---|---|
| Hours | A number |
| Minutes | A number |
| Seconds | A number |
| Decimal hours to convert back | A number |
What each result means
- Decimal hours = [Hours] + [Minutes]÷60 + [Seconds]÷3600
- Decimal minutes = [Hours]×60 + [Minutes] + [Seconds]÷60
- Total seconds = [Hours]×3600 + [Minutes]×60 + [Seconds]
- Decimal days = [Decimal hours]÷24
- Decimal hours as h:mm:ss = [Decimal hours to convert back]×3600
Formula
Decimal hours = hours + minutes ÷ 60 + seconds ÷ 3,600Decimal minutes = hours × 60 + minutes + seconds ÷ 60Back: minutes = fractional hours × 60Worked example
Inputs — Hours: 7; Minutes: 45; Seconds: 0; Decimal hours to convert back: 3.6.
Results — Decimal hours = 7.75; Decimal minutes = 465; Total seconds = 27,900; Decimal days = 0.32292; Decimal hours as h:mm:ss = 3:36:00.
Frequently asked questions
What is 7 hours 45 minutes in decimal?
7.75 hours.
What is 0.6 hours in minutes?
36 minutes (0.6 × 60).
How do I convert decimal hours to minutes?
Multiply the decimal part by 60.
What formula does the Time to Decimal Calculator use?
Decimal hours = hours + minutes ÷ 60 + seconds ÷ 3,600.