Hours Calculator
Calculate hours between times, add or subtract hours, and convert time formats
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Hours Between Times
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Hours Calculation Results
Time Breakdown
Time Conversions
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Each row recalculates with your current inputs. Tap a row to apply it.
Enter times to calculate hours
Choose a calculation mode and enter your time values above
How to Use the Hours Calculator
Perfect for time tracking, work hours, and scheduling
Time Between
Calculate exact hours and minutes between two specific times
Add Hours
Add specific hours and minutes to any starting time
Work Hours
Calculate work hours with breaks and optional pay calculation
Authoritative sources and references
The official standards, guidelines, and research behind this calculator's methodology.
Hours Calculator FAQ
How do I calculate hours between two times across midnight?
Enter the start time and end time as usual. If the end time is earlier than the start time, the calculator treats it as the next day, so a shift from 10 PM to 6 AM correctly returns 8 hours.
What are decimal hours and why do payroll systems use them?
Decimal hours express minutes as a fraction of an hour, so 7 hours 30 minutes becomes 7.5 hours. Payroll and billing systems use decimal hours because they multiply cleanly with hourly rates.
Can I subtract break time from worked hours?
Yes. Calculate the gross hours between clock-in and clock-out first, then subtract the break duration in the time subtraction mode to get net working hours.
How do I figure out overtime hours above 40 per week?
Sum the week's daily hours first, then split the total: everything up to 40 is regular time, and the remainder is overtime. In the U.S., nonexempt workers covered by the FLSA earn at least 1.5× the regular rate on the overtime portion; several states add daily-overtime rules.
How does quarter-hour rounding work on timesheets?
Many employers round clock times to the nearest 15 minutes (8:07 becomes 8:00, 8:08 becomes 8:15) under the "7-minute rule." Rounding must average out in your favor and against you evenly — a schedule that always rounds down is a compliance red flag.
What is the difference between 8:30 and 8.5 hours?
They are the same duration in different notations: payroll systems typically want decimal hours (8.5), because 30 minutes is half an hour. The conversion is minutes ÷ 60, so 7 hours 42 minutes = 7.7 decimal hours.
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