Hours Worked Calculator
Totals a shift's paid hours after breaks.
Result
- Hours worked
- 8 h 15 min
- Decimal hours
- 8.25 hours
How to use the hours worked calculator
- Enter the clock in.
- Enter the clock out.
- Enter the unpaid break (minutes).
- The results update as you type, or press Calculate.
- Read the hours worked first, then the supporting figures below it.
Formula
Hours = out − in − break.
Worked example
For example, with these inputs:
- Clock in: 08:30
- Clock out: 17:45
- Unpaid break (minutes): 60
the calculator returns:
- Hours worked: 8 h 15 min
- Decimal hours: 8.25 hours
Background
Singapore has 11 gazetted public holidays a year, and when one falls on a Sunday the following Monday is a holiday. Working-day calculations therefore need holidays removed separately from weekends.
The Gregorian calendar has months of 28 to 31 days and adds a leap day almost every four years, which makes counting days by hand surprisingly error-prone. Converting dates to day numbers and subtracting avoids the problem.
Frequently asked questions
How does the hours worked calculator work?
It applies this formula: Hours = out − in − break.
Does this count Singapore public holidays?
No. It counts calendar days or weekdays. Subtract any public holidays in the period yourself.