Turn the hours you worked into itemized invoice line items. Enter your rate, add a line per task or per day, and copy the result straight onto an invoice. Free, no signup.
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Rounding changes what you bill. Rounding every short task up to the nearest 15 minutes is normal practice, but agree it with the client before the work starts rather than explaining it on the invoice.
It turns tracked time into the lines that actually go on an invoice. You enter the hours you worked and the rate you charge, and it returns a subtotal per task and a total for the job, formatted so you can paste it onto an invoice without retyping anything.
Most time trackers are built to record time, not to bill it, and most invoicing tools assume you already know the amounts. This sits between the two: hours and a rate in, invoice-ready line items out.
Enter the hourly rate you charge and choose an increment. Fifteen minutes is the most common on professional work.
Describe the work, enter the hours, and override the rate on any line that is billed differently.
Copy the formatted block and paste it onto your invoice, or email it to yourself to finish later.
Rounding is the part people get wrong, and it is worth being deliberate about because it changes the total. Billing in fifteen minute increments is the widely used default for professional services: it keeps the arithmetic simple and it stops a two minute email becoming a line item nobody can price.
The rule that matters is not which increment you pick, it is that the client knows the increment before the work starts. Put it in the engagement terms. An invoice is a bad place to introduce a billing policy for the first time.
If you bill several clients at different rates, override the rate on the line rather than running the calculator twice. The effective average rate shown above the subtotal is a quick check that the mix came out where you expected.
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A line that says eight hours is harder to defend than a line that says what the eight hours produced. Write the task description the way the client would describe the outcome, not the way your timer recorded it, and keep the underlying notes in case a line is ever queried.
If you also claim mileage on the same job, work it out with the mileage deduction calculator and add it as its own line rather than folding it into an hourly figure. If you are still setting your rate, the what should I charge calculator works out a defensible one from your income target.