Terms

Terms of use

The calculator is free to use, and the content on this page is provided as-is for informational purposes.

Can I rely on the results?

Results are informational. Verify important figures against your own records or a spreadsheet before relying on them.

How should I verify the calculation?

Cross-check a few values against a spreadsheet formula. The verification section on the homepage maps each calculation to its spreadsheet equivalent.

How is the content licensed?

Source code is on GitHub. Page content may be quoted with attribution, such as a link back here.

Can I use the calculator on my own site?

Yes — use the embed feature on the homepage to add the calculator to any article. All calculations still run in the visitor's browser.