Free tools
Free invoice calculators
Quick answers for the numbers on your invoices: sales tax by state, late fees, due dates and hourly totals. Every result opens as a ready invoice, free and without sign-up.
Calculators
- Sales tax calculatorAdd sales tax to a price for any US state, or find the tax inside a price, with 2026 state rates and local tax notes. Free, no sign-up.
- Late fee calculatorWork out the late fee and interest on an overdue invoice: a monthly or yearly rate by the day, plus an optional flat fee. Free, no sign-up.
- Invoice due date calculatorFind the due date for Net 7, 15, 30, 45 or 60 payment terms, or any number of days, from the invoice date. Free, instant, no sign-up.
- Hourly rate invoice calculatorMultiply hours by your hourly rate, add sales tax if it applies, and turn the total into an invoice. For freelancers and contractors. Free.
Frequently asked questions
Are these calculators free?
Yes, all of them, with no sign-up. They run in your browser: nothing you enter is sent to us.
Can I turn a result into an invoice?
Yes. Each calculator has a button that opens our free invoice editor with the numbers filled in. Add your details and download the PDF.