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Turn one span into decimal hours, project a fixed week through the year, and total a week whose days differ, with overtime and gross pay.
Work Hours Calculator
Enter your start time, end time, and unpaid break to see how many hours you work. The work hours calculator projects the figure over a week, a month, and a year.
Runs in your browser. Your data is not uploaded.
How to use the Work Hours Calculator
- Enter your Start time and End time.
- Enter your unpaid Break in minutes and the Days worked per week.
- Press Calculate. You get hours per day first, then the weekly, average monthly, and yearly totals.
How it works
day = (end − start, +24 h if negative) − break week = day × days month = week × 52 ÷ 12 year = week × 52
- start, end: your daily start and end times. An end earlier than the start is treated as an overnight shift.
- break: unpaid break time in minutes
- days: days worked per week, from 1 to 7
- month: an average month, because a year has 52 weeks but months have different lengths
Examples
- 08:30 to 17:00 with a 45-minute break, 5 days a week: 7 h 45 m per day (7.75 hours), 38.75 hours a week, 167.92 hours in an average month, and 2,015 hours a year.
- 22:00 to 06:00 with a 30-minute break: 7 h 30 m per day. The shift runs overnight.
Full-time hours per week, month, and year
| Hours per week | Average per month | Per year |
|---|---|---|
| 35 | 151.67 | 1,820 |
| 37.5 | 162.5 | 1,950 |
| 40 | 173.33 | 2,080 |
The monthly figure is an average. Months have between 28 and 31 days, so the number of working days in any given month varies. Multiplying weekly hours by 52 and dividing by 12 gives the figure most employers use when they turn an annual salary into an hourly rate.
The yearly figures don't subtract vacation or public holidays. Take those days off the total if you need the hours actually worked.
Limitations
- The yearly figure does not subtract vacation or public holidays.
- A break as long as the shift, or longer, gives an error.
- Every working day is assumed to have the same hours. If your hours change from day to day, use the time card calculator.
Frequently asked questions
How do I calculate my work hours?
Subtract your start time from your end time, then subtract unpaid breaks. Multiply by the days you work to get a weekly total.
Should I subtract my lunch break?
Subtract it if it is unpaid. Paid breaks count as work time.
How many work hours are in a year?
A 40-hour week comes to 2,080 hours a year (40 × 52) before vacation and public holidays.
What if my hours change every day?
Use the Time Card Calculator. It takes different times for each day of the week.
Related tools
Often used together with Work Hours Calculator.
Time Card Calculator
A one-week timesheet with a row per day, overtime, and pay.
Time Duration Calculator
Measures the elapsed time between a start clock time and an end clock time.
Time Calculator
Adds and subtracts amounts of time, or works out the time 30 minutes from 3:50.