Hourly Invoice Calculator

Turn hours and hourly rates into an invoice total, with expenses, discounts, tax, and deposits.

How is hourly invoice calculator worked out?

An hourly invoice total is your hours worked multiplied by your hourly rate, plus any reimbursable expenses, minus any discount, plus tax on the discounted amount, less any deposit already received.

Hourly Invoice Calculator

Balance due

$3,000.00

Invoice total
$3,000.00
Effective rate per hour
$75.00
Total invoiced divided by hours billed.
Show the working
40 hours at hourly rate$3,000.00
Reimbursable expenses$0.00
Subtotal$3,000.00
Discount-$0.00
Tax$0.00
Invoice total$3,000.00
Less deposit paid-$0.00
Balance due$3,000.00

Billing by the hour puts the burden of proof on the invoice: the client is checking a number of hours against their memory of the work. Keeping reimbursable expenses on a separate line from the hourly fee is what makes that check easy, and it stops expenses being absorbed into your effective rate.

The formula

Fee = hours × hourly rate
Subtotal = fee + reimbursable expenses
Discount = subtotal × discount %
Tax = (subtotal − discount) × tax rate
Total = subtotal − discount + tax
Balance due = total − deposit paid

Expenses are added before tax here because reimbursed costs are generally part of the consideration for your supply. If you are re-billing a cost as a disbursement rather than as your own expense, the treatment can differ — worth confirming with an accountant if the amounts are material.

Grouping hours so the invoice gets approved

A long invoice of single-hour entries invites an audit; a single line reading "consulting, 40 hours" invites a question. The middle ground works best: group hours by project, deliverable or week, so the client can map each line to something they recognise. If you track time in six-minute increments, round to a sensible unit on the invoice and say what that unit is — precision the client cannot verify reads as noise rather than rigour.

Deciding what a billable hour includes

Whether you bill travel time, admin, revisions or the call where the work was scoped should be agreed before the first invoice, not litigated on it. Where you do bill them, put them on their own lines at whatever rate was agreed rather than folding them into project hours — a client who spots unlabelled admin time inside a delivery line will start checking everything.

Frequently asked questions

How do I calculate an hourly invoice?

Multiply the hours you worked by your hourly rate to get the fee, then add any reimbursable expenses. Subtract any agreed discount, apply tax to what remains, and deduct any deposit already paid to get the balance due.

Should expenses be billed at my hourly rate?

No. Reimbursable costs should be billed at what they cost you, on their own line, labelled as an expense. Charging your hourly rate against an expense makes your invoice hard to approve and obscures your actual rate.

How should I round billable hours?

Pick one increment — commonly 15 minutes, sometimes 6 — apply it consistently, and state it in your terms. What matters more than the increment is that it never changes between invoices, because inconsistent rounding is what makes a client start checking your arithmetic.

Put the number on an invoice

The free invoice generator builds the document around your figures — line items, tax, payment terms — and downloads a print-ready PDF. No signup required.

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