Billable Hours Calculator
A free billable hours calculator that converts minutes to tenths of an hour, totals your time across every entry, and works out the fee. Add your tasks below to calculate billable hours in seconds — no signup, nothing to install.
Minutes-to-tenths conversion chart
The standard legal increment is a tenth of an hour — six minutes. Use this minutes-to-tenths chart to convert any block of time when you bill by hand.
Stop converting minutes by hand
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How to calculate billable hours
To calculate billable hours, convert the time you spent on each task into decimal hours and add them up. Decimal billing divides the hour into tenths, so six minutes equals 0.1 of an hour. To convert minutes to tenths of an hour, divide the minutes by 60 — or round up to the next six-minute increment using the chart above.
Most law firms and consultants bill in 6-minute increments because it keeps invoices consistent and easy to audit: a quick two-minute email and a five-minute call both land at 0.1 hours. Once every entry is in tenths, multiply the billable hours total by your hourly rate to get the fee. This billable hours calculator handles that rounding and the math for you, so you can convert minutes to tenths of an hour and total your day in one place.
Frequently asked questions
- How do you convert minutes to billable hours?
- Divide the number of minutes by 60 to get the decimal value, then round to your billing increment. For tenth-of-an-hour billing, round up to the nearest six minutes — so 13 minutes becomes 0.3 hours.
- What is a billable hour in tenths?
- Billing in tenths splits each hour into ten 6-minute units of 0.1 hour. It's the most common format on legal invoices because it maps cleanly to short tasks like calls and emails.
- How many billable hours are in a workday?
- That depends on your utilization, not the clock. An eight-hour day rarely yields eight billable hours once you subtract admin and breaks — many professionals target six to seven billable hours from a full day.
- Why bill in 6-minute increments?
- Six minutes is one tenth of an hour, which keeps decimal math simple and rounding predictable. It also avoids the larger rounding swings you get with quarter-hour (15 minute) billing.