Free calculators for invoicing

Quick calculators and AI helpers for the numbers and emails behind every invoice — all free. The calculators run entirely in your browser.

Free · Runs in your browser · No sign-up

VAT calculator
Add or remove VAT, GST or consumption tax — with current rates for 40+ countries.
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Sales tax calculator
Add sales tax to a price or back it out of a total — for any US state or city rate.
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Hourly rate calculator
Work out the hourly, day and project rate you need to hit your income goal.
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Late fee calculator
Calculate late payment interest and fees on an overdue invoice.
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Invoice due date calculator
Turn an invoice date and payment terms like Net 30 or EOM into an exact due date.
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Profit margin calculator
Calculate profit margin and markup, or find the price for a target margin.
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AI invoice generator
Describe your work in plain words and get a ready invoice with line items, quantities and prices.
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Payment reminder email
Write a friendly, firm or final reminder for an overdue invoice — ready-made templates plus an AI writer.
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VAT calculators by country

Preset with each country’s current standard and reduced rates.

Turn the numbers into an invoice

Create a professional invoice with the right currency and tax in under a minute. Free, private, no sign-up.

Create an invoice — free