Free calculators for people who bill clients.
Six free tools for freelancers and agencies: make an invoice, check whether reverse charge applies, work out US quarterly estimated tax under safe harbor, a project’s margin, a minimum hourly rate and a late fee. Each runs in your browser, shows how the sum is worked out, and needs no account.
Tools
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Invoice generator
Make an invoice in your browser with items, tax and totals to the cent, then print it or save it as a PDF. No sign-up; nothing is uploaded.
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VAT reverse charge checker
Pick where you and your client are to see whether EU reverse charge, domestic VAT, OSS or UK outside-the-scope rules apply to your services.
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US quarterly estimated tax calculator
Work out the 2026 safe harbor minimum from last year's tax and split it across the four IRS due dates, with the 110% rule for higher incomes.
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Project margin calculator
Enter what you billed, team hours at cost, contractors and software to see a project's Cost of Execution and true margin in money and percent.
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Freelance rate calculator
Work out the minimum hourly and day rate you need from your target take-home pay, tax reserve, business costs and the hours you can bill.
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Late fee calculator
Calculate a late fee on an unpaid invoice as a flat fee, a one-time percentage or a monthly rate pro-rated by day, with a grace period.
Estimates, not advice. The tools apply general rules and the numbers you enter. Check anything you rely on with your accountant.
Do these sums on every invoice, automatically.
Set up your workspace, add your logo and send an invoice in your own template. Every feature is open during the trial.
$7 today for 7 days of full access. On day 7 Pro starts at $99 a month (or $948 a year) unless you cancel first. Cancel any time from Settings > Billing. VAT or sales tax may be added at checkout.