Time Clock Calculator
A time clock calculator adds your daily clock-in and clock-out times into total weekly work hours. Enter each day, subtract unpaid breaks, and the tool returns total hours, decimal hours, overtime past 40 hours, and optional gross pay from an hourly rate.
Quick answer
Enter clock-in and clock-out times for each day you worked.
| Day | Clock in | Clock out | Break (min) | Hours |
|---|---|---|---|---|
| Monday | - | |||
| Tuesday | - | |||
| Wednesday | - | |||
| Thursday | - | |||
| Friday | - | |||
| Saturday | - | |||
| Sunday | - |
What this tells you
- •Enter clock-in and clock-out times for each day you worked.
- •Unpaid break minutes are subtracted from each day.
- •Hours past 40 in the week are flagged as overtime, and an hourly rate adds a gross-pay estimate.
How to Use
- 1Enter clock-in and clock-out times for each working day in 24-hour HH:MM format.
- 2Add unpaid break minutes for any day that had a lunch or rest break.
- 3Leave a day blank if you did not work it.
- 4Add your hourly rate to estimate gross pay, then calculate.
How It Works
Formula
Day minutes = clock out - clock in (add 1440 if the shift crosses midnight) - break minutes
Weekly minutes = sum of all day minutes
Total hours = weekly minutes / 60
Overtime hours = max(0, total hours - 40)
Gross pay = (regular hours x rate) + (overtime hours x rate x 1.5)Each day is converted to minutes, the unpaid break is removed, and the days are summed into weekly hours. Hours above the 40-hour threshold are paid at the overtime multiplier when an hourly rate is provided.
Calculation note: values are processed in the order shown above, using the current input units.
Worked Examples
Full week with overtime
Six 8-hour days total 48 hours. The first 40 pay $800 and the 8 overtime hours pay $240 at time and a half, for $1,040.
Day shift with a lunch break
8.5 hours on the clock minus a 30-minute unpaid lunch leaves 8 net hours.
Minutes to Decimal Hours
Convert break and shift minutes into the decimal hours used on most timesheets and pay systems.
| Minutes | Decimal hours |
|---|---|
| 15 min | 0.25 |
| 20 min | 0.33 |
| 30 min | 0.50 |
| 45 min | 0.75 |
| 50 min | 0.83 |
| 60 min | 1.00 |
Decimal hours = minutes / 60. Payroll systems usually pay in decimal hours, not hours and minutes.
How Weekly Overtime Works
Under the federal Fair Labor Standards Act, most hourly employees earn overtime at 1.5 times their regular rate for hours worked beyond 40 in a single workweek. This tool uses that 40-hour weekly threshold by default.
Overtime here is based on total weekly hours, not daily hours. Some states and contracts use a daily overtime rule instead, so check your local rules before relying on the estimate for payroll.
Common mistakes
- Mixing 12-hour AM and PM entries with 24-hour HH:MM format
- Forgetting to subtract unpaid lunch or rest breaks
- Counting overtime per day instead of per week over 40 hours
- Reading decimal hours as hours and minutes (0.50 hours is 30 minutes, not 50)