Time card calculator
Weekly hours from start and end times, with breaks, overtime and pay.
About this calculator
This time card calculator adds up your hours for the week. Enter each day's start time, end time and break, one day per line.
It shows the total in hours and minutes and in decimal hours, splits out overtime and works out your pay if you add an hourly rate.
How it works
Each day’s hours are the end time minus the start time, less the break; a shift that ends after midnight runs into the next day. Hours in the week above the overtime threshold are paid at the overtime rate.
Last reviewed:
Worked example
- One day per line: start time, end time, break in minutes: 9:00 17:30 30; 8:45 17:15 30; 9:00 18:00 45; 9:00 17:30 30; 8:30 16:00 30
- Overtime after: 40 hours a week
- Overtime pay rate: × 1.5
Total hours: 39 h 15 min
Common questions
How do I calculate hours worked?
Subtract the start time from the end time and take off unpaid breaks. 9:00 to 17:30 with a 30-minute break is 8 hours.
How do I convert minutes to decimal hours?
Divide the minutes by 60. 15 minutes is 0.25 hours and 45 minutes is 0.75, so 7 h 45 min is 7.75 hours.
When is overtime paid?
Under US federal law, most hourly workers get at least 1.5 times their rate for hours over 40 in a week. Other countries and states have their own rules.
Sources and further reading
The story behind it
Where the idea came from: The first time clock was patented in 1888 by Willard Bundy, a jeweller in Auburn, New York.
Bundy's company later became part of what is now IBM. Workers punched a card at the start and end of each shift, and the totals decided their pay, much as this calculator does.
Why you can trust this calculator
- It runs in your browser. Nothing you type into it is sent anywhere.
- The method is explained on this page, so you can check it yourself.
- Free to use, with no sign-up.
- Results are estimates, so please double-check anything important.
- Spotted a mistake? Tell us and we'll look into it.
After 15 years as a mathematics educator, I built CalculStore to give students, teachers, professionals and anyone working with numbers simple, reliable tools.
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