Hours Calculator
Add up multiple time durations and get total hours.
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How It Works
Calculates the number of hours between two times by subtracting start from end. Useful for payroll, billing, project tracking, and scheduling. Enter times in decimal hours (e.g., 9.5 for 9:30am).
Formula
Sum of all durationsQuick Reference
Common calculations — results you can verify instantly.
9am to 5:30pm
8.5 total hours
7.5 hrs working (8 hrs-30min lunch)
8am to 6pm
10 hours
9 hrs (minus 1hr lunch)
40hr week rate
$25/hr × 40
$1,000/week
Tips & Shortcuts
For billing: multiply hours by hourly rate.
Weekly hours: sum daily hours. Over 40 = overtime in the US.
Convert time to decimal: 7:45am = 7 + 45/60 = 7.75.
Common Mistakes
Entering 8:30 as 8.30 instead of 8.5
8:30 in decimal is 8.5 hours (30 minutes = 0.5 hours), not 8.30.
Forgetting lunch break deduction
Net work time = Total time - unpaid break duration.
Frequently Asked Questions
5:30pm = 17.5, 9am = 9.0. Total = 17.5 - 9.0 = 8.5 hours.
Overtime pay = regular rate × 1.5. If you earn $20/hr, overtime is $30/hr for hours above 40/week.
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