Adding up a week of clock-in and clock-out times by hand means juggling minutes that don’t divide neatly into hours, then subtracting breaks and splitting off overtime. This time card calculator does all of it. Fill in each day and you get total hours, decimal hours for payroll, overtime and gross pay.

How do I calculate hours worked on a time card?

For each day, subtract the clock-in time from the clock-out time and take away unpaid breaks. Add the days together for the weekly total. To get decimal hours for payroll, divide the minutes by 60, so 7 hours 30 minutes becomes 7.5 hours.

Converting minutes to decimal hours

Minutes	Decimal
15 min	0.25
20 min	0.33
30 min	0.50
45 min	0.75
50 min	0.83

Payroll systems multiply decimal hours by the hourly rate. Writing 7:30 as 7.30 is a common mistake that underpays by 12 minutes every day.

How overtime is worked out

Overtime hours = Total hours − overtime threshold
Pay = regular hours × rate + overtime hours × rate × multiplier

Many employers pay 1.5 times the normal rate after 40 hours a week, but the threshold and multiplier depend on your contract and local labor law. Both are editable here.

How to use the Time Card Calculator

Enter clock-in times
Type the start time for each day you worked. Leave days off blank.
Enter clock-out times
Type the finish time. Shifts that end after midnight are handled automatically.
Add unpaid breaks
Type the unpaid break in minutes, for example 30 for lunch.
Set rate and overtime
Enter your hourly rate and when overtime starts. Change the multiplier if your overtime isn’t time-and-a-half.
Read the totals
The weekly total shows in hours and minutes, with decimal hours, regular and overtime hours and gross pay.