About calcfig

calcfig is a small, independent set of free calculators for everyday figures: tips and bill splitting, sales tax, VAT and GST, and grade averages for the United States, the United Kingdom and Australia.

How the calculators are checked

Tax rates and grading scales are taken from official sources where possible (government tax offices and university pages) and each calculator shows the date it was last checked and links to its sources. Every formula has automated tests with worked examples, including the examples published by the universities themselves.

Rules differ between states, universities and businesses, so each tool shows the assumptions it uses and lets you change them. Results are estimates; your receipt, invoice or academic transcript is the final word.

calcfig is not affiliated with any university. Where a page uses a university’s name, it is only to describe that university’s publicly available rules, and the university is the final authority on its own results.

Privacy

The numbers you type are worked out in your browser and are not sent to us. See the privacy policy for how analytics and advertising work on this site.

Corrections

If you spot an out-of-date rate or a mistake, please let us know. We would much rather fix it quickly.