Free tools for accountants

Calculators that show their formulas, reference tables from the official source, and templates to adapt. They run in your browser, and results copy straight into Excel.

Calculators

Reference tables

Templates

How these tools are built

Where a tool uses official figures, such as the IRS MACRS percentages or the ASC 842 measurement rules, the page quotes and links the source and shows the date it was last reviewed. The calculators’ math is covered by automated tests, run on each proposed change, that check results against published examples and closed-form formulas. If you find an error, the about page explains how to report it.