What is timesheet rounding and when to avoid it
Updated 3 min read By David from TimeRetain
Timesheet rounding turns exact work times into fixed blocks. A task that took 14 minutes might become 15 minutes on the timesheet.
If you track your own time, keep the stored hours exact. If an invoice needs rounding, use a copy and keep the original hours.
Use rounding when the billing method calls for it, rather than to make the record look tidy. It changes the charged total when the recorded time isn’t already on that increment.
How timesheet rounding works
You can round each entry’s duration to the nearest quarter hour: a 14-minute task becomes 15 minutes. Or you can round the start and end times, then calculate the duration.
The two methods can give different results for the same work. A 44-minute block from 09:08 to 09:52 rounds to 45 minutes as a duration.
Round its start and end times instead, and the block becomes 09:15–09:45. That is 30 minutes, even though the work took 44 minutes.
The examples below round start and end times to the nearest quarter hour. They use whole-minute values.
Within each block, minutes 1–7 round down to the block start and 8–14 round up to the block end. Here’s an example day:
| Worked | Rounded (nearest 15) | Difference |
|---|---|---|
| 09:08–09:52 | 09:15–09:45 | −14 minutes |
| 10:07–11:23 | 10:00–11:30 | +14 minutes |
| 11:31–12:29 | 11:30–12:30 | +2 minutes |
| Total | +2 minutes |
Difference is what rounding did to the record: − is time removed, + is time added.
These three entries add two minutes overall. That doesn’t mean another day’s entries will balance out.
What rounding does to your record
Rounding changes the record, not the work.
- A 22-minute call from 10:08 to 10:30 becomes 10:15–10:30: seven minutes gone.
- Moved five minutes earlier, 10:03–10:25, it becomes 10:00–10:30: eight minutes you did not work.
- A 7-minute fix from 10:12 to 10:19 vanishes: both times land on 10:15.
The rounded record hides what changed. Lost minutes are gone, and added minutes look like work.
Even when the daily total comes out right, rounding can move time between tasks. One client’s total can rise while another’s falls.
Nearest rounding isn’t the only method. For durations, rounding up moves every partial block to the next block edge.
Three 2-minute emails rounded up to 15 minutes each become 45 minutes after 6 minutes of work. Combine those durations first, and rounding up gives 15 minutes.
Keep the exact record
A manual timer records when you start and stop. Keep those times so you can compare an exact total with a rounded copy later.
If you round time for an invoice, agree on the method with the client before work starts. Specify the increment, direction, and whether you round each duration, each start and end time, or the combined invoice total.
The billable hours calculator can turn your hours and rate into an amount. It does not apply a billing-rounding rule.
Where TimeRetain fits
TimeRetain helps you keep the hours behind an invoice, so you can explain the original times later.
That gives you a record of the time you spent, even when the invoice uses a rounded total.
Keep exact minutes on your own device. Use a copy when you need rounded totals.
Questions and answers
What is timesheet rounding?
Timesheet rounding moves an exact work time to a fixed block. You can round a duration or round its start and end times. These methods can give different totals for the same work.
How does 15-minute timesheet rounding work?
With whole-minute values, nearest-quarter-hour rounding moves minutes 1–7 down to the block start and minutes 8–14 up to its end. For a duration, 14 minutes becomes 15 minutes. Rounding start and end times instead can give a different total.
Should I round my own time record?
Keep your stored hours exact. If you need rounded values for an invoice, use a copy of the record. Decide whether to round each duration, each start and end time, or the combined total.