Six Minute Rule Calculator

Round a clock time to the nearest one tenth of an hour using six minute increments. This is the standard interval for legal time billing and many consulting practices, where work is invoiced in 0.1 hour units (sometimes with a 0.1 hour minimum per task).

Use it for legal billing, consulting time, or any setting where work is invoiced in tenths of an hour. It is also useful when you are converting a stopwatch reading to the right tenth value before logging it into a billing platform, or when you are reviewing entries on a partner draft and want to spot rounding patterns.

The calculator finds the nearest six-minute boundary, with three minutes or less rounding down and four or more rounding up. The result is reported as the rounded clock time, the difference in minutes from the original, the two-decimal hour value, and a tenth-of-hour value like 1.4 or 2.7 hours.

The rounded clock time is the time that goes on the time entry. The tenth value is what feeds into a billing rate. The two-decimal value is helpful when you are exporting to a system that does not enforce tenths but you still want a clean billable number.

A task that took 27 minutes rounds to 30 minutes, or 0.5 of an hour. A task of 4 minutes rounds to 6 minutes, or 0.1 of an hour. A 1 hour 22 minute review rounds to 1 hour 24 minutes, which is 1.4 hours. A 7 minute call rounds to 6 minutes, which is 0.1 hours; an 8 minute call rounds to 12 minutes, or 0.2 hours.

Different firms have different minimum billing units. Confirm whether your firm bills any task at a 0.1 hour minimum or rounds true to the nearest tenth. Clients sometimes negotiate caps on small-task billing, so check the engagement letter before invoicing many short entries at 0.1 hours each. Some clients and courts expect every entry to be tied to a clear task description, not just a time block; pair six-minute rounding with concise narratives so an invoice can survive a billing audit.