Billable Hours Calculator
Add up your billable time across tasks, apply your hourly rate and billing increment, and get an invoice-ready total — no signup, no spreadsheet.
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Turn tracked time into invoices automatically
Chronoid captures every billable minute on your Mac — every app, website, and document, recorded automatically and stored 100% locally. Assign time to clients and generate invoice PDFs with your rates and taxes in one click.
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How billing increments work
Increment billing means every time entry is rounded up to the nearest block before you multiply by your rate. The 6-minute (0.1h) increment is the legal-industry standard; 15-minute (0.25h) blocks are common in consulting and agencies.
Here is a worked example at 6-minute increments and $75/hour: you spend 7 minutes replying to a client email. Seven minutes is more than one 6-minute block, so it rounds up to the next block — 12 minutes, or 0.2h — and bills as $15.00. A 25-minute call rounds up to 30 minutes (0.5h, $37.50), and a task that lands exactly on a block, like 18 minutes (0.3h), doesn't round at all. Switch the increment to “Exact” in the calculator above to see precisely how much the rounding adds to an invoice.
Stop leaking billable time
Rounding rules only matter for the time you actually remember to log — and that is where most of the money leaks. Reconstructing your day at 6 pm from memory silently drops the 4-minute Slack answer, the second look at a contract, the quick production fix over lunch. Across a month, those forgotten fragments routinely add up to 10–20% of billable time, which at $75/hour on a 30-billable-hour week is hundreds of dollars simply never invoiced.
The fix isn't more discipline; it's removing the logging step entirely. An automatic tracker like Chronoid records which app, site, or document was in front of you all day on your Mac, so your billable time is captured whether or not you thought to start a timer. When it's time to bill, you review the timeline, assign blocks to clients, apply your increments — and the invoice writes itself.
Frequently Asked Questions
- How do I calculate billable hours?
- Add up the time you spent on each client task, convert it to decimal hours (minutes ÷ 60), and multiply by your hourly rate. If you bill in increments — common in law and consulting — round each task's time up to the nearest increment first, then total. This calculator does all of that for you: enter each task's hours and minutes, pick your increment, and it shows the billed hours per task plus the invoice total.
- What is 6-minute increment billing and why do lawyers use 0.1h?
- Six-minute increments divide an hour into ten equal blocks of 0.1 hours each, which makes the math on an invoice trivially clean: a 6-minute email is 0.1h, an 18-minute call is 0.3h. Law firms adopted it because clients and courts expect itemized time in tidy decimals, and because tracking to the exact minute across dozens of short matters per day is impractical. Any time entry is rounded up to the next 0.1h — so a 7-minute task bills as 0.2h.
- Should freelancers round up their billable time?
- Rounding up to a modest increment (6 or 15 minutes) is a widely accepted industry norm — it compensates you for the real overhead of context-switching into a task, and clients used to working with law or consulting firms expect it. The keys are transparency and consistency: state your increment in your contract or proposal, apply it the same way to every entry, and keep increments reasonable (rounding a 2-minute email to a full hour will destroy trust). This calculator shows exactly how many minutes rounding added, so you can sanity-check that it stays fair.
- What percentage of work time is typically billable?
- For most freelancers and consultants, only about 60–80% of working time ends up billable. The rest goes to admin, proposals, invoicing, marketing, email, and learning. That is why your hourly rate needs to cover more than the billable hour itself — if you work 40 hours a week but bill 28 of them, your effective rate is 30% lower than your list rate. Track the ratio over a few weeks; if it dips below 60%, look at what non-billable work you can cut or systematize.
- How do I capture billable hours I forget to log?
- Stop relying on memory. Studies of time-tracking behavior consistently find that people who log hours manually lose 10–20% of their billables to forgotten tasks — quick calls, email threads, "just one small fix." Chronoid solves this by recording every app, website, and document you work in on your Mac, automatically and 100% locally. At invoicing time you review the timeline, assign entries to clients, and turn the tracked time straight into invoice PDFs — nothing slips through.