How decimal hours work
- 1 minute = 1/60 hour ≈ 0.01667
- 15 minutes = 0.25 hour
- 30 minutes = 0.5 hour
- 45 minutes = 0.75 hour
Most payroll and invoicing systems prefer decimal hours; clocks and timesheets prefer HH:MM.
Hours to decimal converter
Convert HH:MM (or HH:MM:SS) to decimal hours, and back. The two columns sync — change either side.
HH:MM:SS form
Decimal hours
Decimal hours
1.5
Decimal minutes
90
Decimal seconds
5400
HH:MM
01:30
HH:MM:SS
01:30:00