Hours ↔ Decimal Converter

Convert HH:MM:SS to decimal hours and back — useful for payroll, timesheets, scientific reports.

Hours ↔ Decimal Converter

Convert HH:MM:SS to decimal hours and back. Useful for payroll, timesheets, and reporting.

Hours: Minutes: Seconds:

Decimal hours:

About the Hours ↔ Decimal Converter

Convert in either direction: enter hours / minutes / seconds and get decimal hours (1h 30m = 1.5), or enter decimal hours and get HH:MM:SS.

Common in payroll where employees record time in HH:MM but pay systems use decimals, in scientific reports, and any context that needs both representations.

How it works

1 hour = 60 minutes = 3,600 seconds. Decimal hours = hours + minutes ÷ 60 + seconds ÷ 3,600. Going the other way, decimal hours × 3,600 gives total seconds, which is then split back into HH:MM:SS via integer division. The calculator keeps four decimal places of precision — finer than minute-level granularity.

Examples

1h 30m 0s1.5 decimal hours
8h 15m 30s8.2583 decimal hours
7.75 decimal hours7h 45m 0s

Frequently asked questions

Why do payroll systems use decimal hours?

Multiplication by an hourly rate is trivial. 7.5 × $20 = $150. Trying that with 7:30 needs an extra conversion step, so most payroll software stores and prints decimal.

How precise is the decimal output?

Up to four decimal places, which is finer than minute-level precision (one minute is 0.0167 decimal hours).

How do I round to the nearest 15 minutes?

Multiply your decimal hours by 4, round to the nearest integer, then divide by 4. So 1.42 × 4 = 5.68 → 6 → 1.5 hours (1h 30m).