Terms of Use

Effective September 20, 2026.

Using the tools

You may use the free calculators for learning and planning and embed the provided widgets with their attribution. Do not interfere with the service, misrepresent its source, or use it unlawfully.

Check your results

Results depend on your inputs and the assumptions stated on each page. Tools are provided as available without a guarantee that every result fits your individual circumstances. Verify important calculations independently.

Service changes

We may correct formulas, improve interfaces, or change the available tools. Shared URLs are designed to restore inputs, but future changes may affect their interpretation. Keep an independent record when needed.

Read the privacy policy and disclaimer for further details.