Contact us
We read every message. The fastest way to reach us is email - there is no phone number and no ticket queue, so please include enough detail for us to act on your message.
Reporting a calculation error
If a result looks wrong, please send us the tool name, the exact inputs you entered, the result you got, and what you expected instead. If a tool is producing incorrect output we will fix it and note the correction in the changelog.
Suggesting a tool
We add tools based on genuine demand, so suggestions help. Tell us what you were trying to work out, and which fields you would expect the calculator to ask for. We are especially interested in calculators that are genuinely awkward to find or that need a combination of inputs nobody else offers.
Advertising and sponsorship
We display advertising and may accept sponsorship on relevant guides. Sponsored placements are always labelled. For enquiries, email us with your site details and proposed placement.
Response time
We aim to reply within a few business days. If your message is about a broken page or an incorrect result, it will be prioritised.
Privacy
Messages you send us are used only to respond to you. See our privacy policy for the full details.