Billable Hours Calculator

Enter the number of billable hours you worked, add any leftover minutes, then type your hourly rate. The calculator multiplies your rounded time by your rate and shows the invoice amount instantly. That's all most freelancers and consultants need. If your client or firm bills in fixed time blocks, open More options and pick a rounding increment (6, 10, 15, or 30 minutes) and whether to round up or to the nearest block. You can also switch the currency there. Leave the advanced options alone and you get a plain hours × rate total.

A billable hour is time you can legitimately charge a client for a specific project or task — client calls, research, drafting, revisions, and meetings all count, while admin, marketing, and unpaid breaks usually don't. Billable time is the backbone of how agencies, lawyers, accountants, designers, and freelancers price their work. The math is simple: billable amount = billable hours × hourly rate. The tricky part is measuring the time. Most professionals track time in fractional hours (2.5 hours) or in minutes (2 hours 30 minutes), which is why this calculator accepts both an hours field and a minutes field. Many firms then round each entry to a standard billing increment so invoices stay tidy and defensible.

Invoice amount = (rounded billable time in hours) × hourly rate

Where rounded time = round(total minutes ÷ increment) × increment, then divided by 60. For example, 2 hours 20 minutes rounded up to the nearest 15 minutes becomes 2 hours 30 minutes (2.5 hours). With no rounding selected, your exact time is billed. A common shorthand is 'the 6-minute rule' — rounding to 0.1-hour blocks — widely used by law firms.

Example 1 — simple invoice: You worked 10 hours at $100/hr. 10 × $100 = $1,000.00.

Example 2 — hours and minutes: You logged 3 hours 45 minutes at $80/hr. That's 3.75 hours × $80 = $300.00.

Example 3 — billing in 15-minute blocks: You worked 2 hours 20 minutes at $120/hr and round *up* to the nearest 15 minutes. 2:20 becomes 2:30 (2.5 hours) × $120 = $300.00. Without rounding it would be $280.00 — the 10-minute round-up adds $20.

- Track as you go. Reconstructing hours at month-end almost always undercounts your real billable time.
- Agree on rounding up front. Tell clients whether you round to 6, 15, or 30 minutes so invoices never surprise them.
- Round up sparingly. Rounding every small task up to 15 minutes is legal but can feel padded; nearest-increment rounding is friendlier.
- Separate billable from non-billable. Keep admin and internal work off client invoices to protect trust.
- Know your realization rate. If you bill 30 hours but only collect on 24, your effective rate is lower than your quoted rate.