Rounding Rules for Timesheets: Quarter-Hour, Tenth, or Exact?

Once time is in decimal hours, most payroll systems apply one more step: rounding. The rule you pick changes the final number, sometimes by more than people expect over a full pay period.

Quarter-hour rounding (nearest 0.25)

The most common rule in hourly payroll. A punch is rounded to the nearest 15-minute mark before converting, so 7 hours 52 minutes becomes 8.0 hours rather than 7.87. It's simple to audit and matches how many time clocks already round punches.

Tenth-hour rounding (nearest 0.1)

Common in project billing and consulting, where six-minute increments (one-tenth of an hour) are the smallest unit worth tracking. It's finer than quarter-hour rounding but still avoids listing exact seconds on an invoice.

Exact decimal (no rounding)

Used when contracts or labor law require paying for time actually worked, down to the minute or second. This is the safest default when you're not sure which rule applies — you can always round a precise number later, but you can't recover precision that rounding already removed.

A practical rule of thumb

Store and calculate exact decimal hours first, then apply rounding only at the final display or export step if your policy requires it. That keeps totals across a multi-entry timesheet accurate, since rounding each entry individually before summing can drift further from the true total than rounding once at the end.