Decimal Hours Calculator
Convert between decimal hours (like 7.5) and H:MM time format (like 7:30), in either direction — just enter either format and it auto-detects which one you used.
- Free to use
- Accurate results
- No registration required
- Works on all devices
Enter either a decimal number of hours or an H:MM time, and this calculator converts it to the other format.
Enter either a decimal number of hours (e.g. 7.5) or a time as H:MM (e.g. 7:30).
Your result
7.5
Decimal hours
H:MM format7:30
Interpreted your input asdecimal hours
AI explanation
Formula
Auto-detects H:MM vs decimal input by checking for a colon, then converts to the other representationWorked example
7.5 decimal hours to H:MM
| Field | Value |
|---|---|
| Value | 7.5 |
| Decimal hours | 7.5 |
| H:MM format | 7:30 |
| Interpreted your input as | decimal hours |
Assumptions
- If your input contains a colon, it's treated as H:MM; otherwise it's treated as a decimal number of hours.
Frequently asked questions
Why do payroll systems need decimal hours?
Payroll and billing systems typically calculate wages using decimal hours (like 7.5) so they can multiply directly by an hourly rate — 7 hours 30 minutes isn't directly multipliable without first converting the minutes to a fraction of an hour.
How do I convert 45 minutes to a decimal?
45 minutes is 0.75 of an hour (45 ÷ 60) — enter "0:45" here to see it confirmed.
Does this work in both directions from the same field?
Yes — enter a decimal number (like 7.5) to get H:MM, or an H:MM value (like 7:30) to get the decimal — no direction toggle needed.