Decimal Hours Calculator
Convert hours and minutes to decimal hours and back. Perfect for payroll, billing, and time tracking.
← All time calculatorsDecimal Hours
8.50
8h 30m
Enter hours and minutes to convert
H:MM→Dec
8.50
Smart Insights
How It Works
Decimal hours = hours + (minutes ÷ 60). To convert back: hours = floor(decimal), minutes = round((decimal − hours) × 60).
Frequently Asked Questions
How do I convert hours and minutes to decimal?
Divide the minutes by 60 and add to the hours. Example: 8 hours 30 minutes = 8 + (30 ÷ 60) = 8.5 decimal hours.
How do I convert decimal hours back?
Take the integer part as hours. Multiply the fractional part by 60 to get minutes. Example: 8.5 → 8 hours + (0.5 × 60) = 30 minutes.
Why is this useful for payroll?
Many payroll systems use decimal hours for calculations. This converter helps you prepare accurate time entries.
Is the conversion exact?
Hours and minutes to decimal is exact (minutes ÷ 60). Decimal to hours/minutes rounds to the nearest minute.
What is the maximum value?
The calculator supports up to 999 hours in either direction.
Can I use partial minutes?
Yes. You can enter decimal minutes (e.g., 30.5 minutes = 30 minutes 30 seconds).
Last reviewed: July 20, 2026