How to use the time clock rounding calculator
- Choose the rounding step: 5, 6, 10 or 15 minutes. Choose whether punches round to the nearest step, always in a way that makes shifts longer, or always in a way that makes them shorter.
- Enter the unpaid break per shift and, optionally, your hourly rate.
- List each shift with its clock in and clock out time. Add rows for more shifts.
- Read how rounding changes the paid time and pay, and see each shift before and after rounding.
Formula
Rounded punch = the clock time moved to a multiple of the step
Paid time = rounded clock out - rounded clock in - unpaid break
Change = rounded paid time - exact paid time
Pay difference = change in hours x hourly rate
With nearest rounding, a punch exactly halfway between two marks goes to the later mark. Longer rounds clock in down and clock out up, and shorter does the opposite.
Five shifts on a 15 minute rule
On a 15 minute step, 8:07 rounds to 8:00 and 8:08 rounds to 8:15. Five shifts with a 30 minute break come to 41 hours 50 minutes exactly and 41 hours 45 minutes after rounding, five minutes less. At $20 an hour that is $836.67 exact and $835.00 rounded, a difference of $1.67.
The first shift, 8:07 to 5:02 PM, is 8:25 exactly. Rounded, it runs 8:00 to 5:00 PM, which is 8:30 after the break. Rounding in a way that always lengthens the shift would make it 8:45, and always shortening it would make it 8:15.
How rounding rules work
Some employers round punches to a fixed step so that time is easier to add up. The effect on any one shift can go either way, and over time the rounding should not favor one side. A rule that always rounds in the employer favor, or one that does not average out, can raise legal questions.
This page shows the arithmetic of the rule you choose on the punches you enter, so you can see what a rule does to real times. It does not tell you what is allowed in your state.
Related tools
The time card calculator totals a week with a rounding option and overtime. Convert totals with the decimal hours calculator and see a full pay period in the timesheet calculator. For one shift, the hours calculator is quicker.
Assumptions and limits
- Every punch is rounded on its own, then the break is subtracted.
- A clock out earlier than the clock in is treated as the next day.
- The break is the same for every shift.
- Which rounding rules are allowed varies by state and employer. This is not legal or payroll advice.
Frequently asked questions
How does time clock rounding work?
Each clock in and clock out is moved to the nearest mark on the step you choose. On a 15 minute step, 8:07 becomes 8:00 and 8:08 becomes 8:15.
What is the 7 minute rule?
It is the common name for rounding to the nearest quarter hour, where up to 7 minutes round down and 8 or more round up. The tool applies the same idea to other steps.
Can rounding cost me pay?
It can cost or add a few minutes on any given shift. The tool adds up the effect on the shifts you enter. Whether a rounding policy is lawful depends on how it works out over time and on the rules that apply to you.
What happens with a punch exactly halfway between two marks?
With nearest rounding it goes up to the later mark. On a 10 minute step, 8:05 rounds to 8:10.