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.
- •A clock-out earlier than clock-in is treated as an overnight shift ending the next day.
- •The result does not apply employer rounding, payroll taxes, or location-specific labor rules.
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.
Overnight shift
Because 06:30 is earlier than 22:00, the calculator treats clock-out as the following day. The gross span is 8 hours 30 minutes, and the 30-minute unpaid break leaves 8 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.
An overnight entry is assigned a clock-out on the next calendar day whenever the entered clock-out is earlier than clock-in. For example, 22:00 to 06:00 counts as eight hours. The calculator supports one midnight crossing per entry. It does not infer dates, split a shift between workweeks, or decide which payroll day should receive those hours.
Break minutes are deducted exactly as entered. The tool does not decide whether a meal or rest period should be paid, whether a break was legally compliant, or whether an interrupted meal should count as work. Enter only the unpaid minutes that apply under the relevant policy and law.
The pay figure is gross straight-time and overtime pay before taxes, benefits, tips, bonuses, shift differentials, commissions, reimbursements, and deductions. Payroll systems may also round individual punches under a lawful policy. This calculator uses the exact entered minute totals and rounds displayed decimal hours and money to two decimal places.
All entries are treated as local clock times in the same timezone. A daylight-saving transition can make elapsed time differ from the visible clock difference, and travel between timezones can do the same. Calculate those cases from actual timestamps or review the employer's timekeeping record.
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)
- Entering a paid break as an unpaid deduction
- Assuming an overnight shift is automatically assigned to the correct payroll date
- Using the estimate without checking punch rounding or local overtime rules
Embed this calculator on your site
Drop this single line where you want the calculator to appear. It is responsive, mobile-friendly, resizes automatically, and is free to use with attribution.
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