If you’ve ever stared at a flight log wondering how to turn 2 hours and 42 minutes into a decimal for your logbook, you’re not alone. Pilots, flight instructors, and payroll professionals deal with this conversion constantly, and doing it by hand gets old fast.
The aviation industry records flight time in decimal hours, not minutes. So when your Hobbs meter shows 1:18, you need to log it as 1.3 hours. The same applies to payroll systems that track time in tenths of an hour rather than minutes. One small math mistake can throw off your total flight hours or mess up someone’s paycheck.
This calculator handles the conversion instantly. Enter your time in hours and minutes, and you’ll get the decimal equivalent rounded to the nearest tenth—exactly how the FAA and most payroll systems expect it. You can also work backwards: enter a decimal like 2.7 and see that it equals 2 hours and 42 minutes.
We’ve included a complete reference table showing every minute from 1 to 60 with its decimal value. Tap any cell to convert it automatically. Also, try 24 Hour Clock Converter
How to Use This Calculator
Converting Time to Decimal:
- Make sure “HH:MM → Decimal” is selected at the top
- Enter your duration in hours and minutes (example: 02:42 or just 42 for minutes only)
- The decimal result appears immediately, in this case, 2.7 hours
- Tap “Copy” to paste the value directly into your logbook or spreadsheet
Converting Decimal to Time:
- Tap the swap button or select “Decimal → HH:MM”
- Enter the decimal hours (example: 1.8)
- You’ll see the equivalent in hours and minutes—1:48
Using the Reference Table: Tap “Minutes to Decimal Chart” to expand the full conversion table. You can search for a specific minute value or tap any cell to run that conversion automatically.
Decimal Hours to Minutes Conversion Chart
| Decimal | H:MM | Decimal | H:MM |
|---|---|---|---|
| 0.1 | 0:06 | 1.1 | 1:06 |
| 0.2 | 0:12 | 1.2 | 1:12 |
| 0.3 | 0:18 | 1.3 | 1:18 |
| 0.4 | 0:24 | 1.4 | 1:24 |
| 0.5 | 0:30 | 1.5 | 1:30 |
| 0.6 | 0:36 | 1.6 | 1:36 |
| 0.7 | 0:42 | 1.7 | 1:42 |
| 0.8 | 0:48 | 1.8 | 1:48 |
| 0.9 | 0:54 | 1.9 | 1:54 |
| 1.0 | 1:00 | 2.0 | 2:00 |
The minutes pattern repeats for any hour: 3.7 = 3:42, 5.3 = 5:18, etc.
Frequently Asked Questions
Why does aviation use decimal time instead of minutes? Decimal hours make math easier when calculating totals, fuel burn rates, and instructor billing. Adding 1.3 + 2.7 + 0.8 is simpler than adding 1:18 + 2:42 + 0:48 and converting at the end.
How do I round flight time correctly? The standard method rounds to the nearest tenth. Anything from 1 to 3 minutes rounds down, 4 to 6 rounds to .1, and so on. This calculator follows that convention automatically.
Can I use this for payroll time tracking? Yes. Many payroll systems record time in tenths of an hour. If your timesheet shows you worked 7 hours and 24 minutes, this converts to 7.4 hours for billing or wage calculation.
What’s the decimal equivalent of 15 minutes? 15 minutes equals 0.3 hours (since 15 ÷ 60 = 0.25, rounded to the nearest tenth).
Is there a difference between Hobbs time and tach time decimals? The conversion math is the same for both. The difference is what the meters measure, not how you record the numbers.