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Contact us
Have a question about a calculator, a wrong result, or a tool you want us to add? Send us a message and tell us exactly what happened, so we can check it quickly and reply with a useful answer.
Send a message
Fill in the form below.
We aim to reply to genuine calculator questions. Please allow a few days for a reply, as this is a small tool site, not a live support desk.
Calculator question
Ask how a formula works, why a result looks different, or which calculator fits your project.
Wrong result?
Tell us calculator used, numbers entered, result got, fastest way to reproduce and fix it.
Request a new tool
Tell us tool, inputs, result it should show. We add tools as one calculator, one guide, one worked example.
What we cannot do: we cannot give a live lumber or gravel quote, prices vary by yard, region, date. For a quote, use calculator result and confirm with local supplier.
What to include in your message
- The calculator page you used.
- The numbers you entered, including units, material, waste, and price.
- The result you got, and the result you expected if you hand-calculated it.
- Your project in one line, for example 12×16 ft deck or 10×20 ft patio.
Estimate only. Confirm with your supplier before ordering.