Contact

The fastest way to reach us is by email at [email protected]. We read everything, and we reply to anything that needs a reply.

Reporting a calculation error

These get handled first. To let us reproduce it, please include:

• Which calculator, ideally the page URL
• The exact values you entered
• The result you got, and the result you expected
• Where your expected figure comes from, if you have a source

Calculator pages keep your inputs in the URL, so copying the address from your browser captures the exact state you are looking at.

Requesting a calculator

Tell us what you are trying to work out and why the existing tools do not do it. Requests that describe a real problem are far more useful than a bare name.

Embedding and licensing

Any calculator can be embedded for free using the “Embed this” button on its page. The only condition is that you keep the attribution link intact. For bulk or white-label use, get in touch.

Press and partnerships

Use the same address and mention what you need — we will route it appropriately.