Time to Decimal Calculator
Enter hours and minutes to convert them into decimal hours.
How time converts to decimal hours
This calculator converts the minutes portion of a time into a fraction of an hour by dividing by 60, then adds it to the whole hours — so 30 minutes becomes 0.5, 15 minutes becomes 0.25, and 45 minutes becomes 0.75.
This conversion is especially common in payroll and timesheet systems, which typically need total hours worked expressed as a single decimal number (like 7.5 hours) rather than in hours and minutes (like 7 hours 30 minutes) for calculating pay.
Frequently asked questions
Why do payroll systems use decimal hours instead of hours and minutes?
Decimal hours are easier to multiply by an hourly wage — 7.5 hours × $20/hour is a simple multiplication, while 7 hours 30 minutes requires converting the minutes first. Most payroll software stores and calculates time in decimal form for this reason.
Why isn't 30 minutes equal to 0.30 in decimal hours?
Decimal hours are a fraction of 60 minutes, not 100 — so 30 minutes is half an hour, or 0.5, not 0.30. This is a common point of confusion since it doesn't match the usual base-10 intuition.
Can I convert decimal hours back to hours and minutes?
Yes — take the whole number part as hours, then multiply the decimal remainder by 60 to get minutes. For example, 7.5 decimal hours is 7 hours plus 0.5×60 = 30 minutes.