Contact Us
We read every message and usually reply within a few business days.
Write to [email protected]. For bug reports, please include the tool name, the values you entered and what you expected to happen.
Feedback widget
Each tool page has a short "Was this tool helpful?" widget. It is the fastest way to tell us that a result looked wrong or that a feature is missing.
Corrections and data sources
If you believe a formula or reference value is incorrect, send the source you rely on. We review credible corrections and update the tool when appropriate.
Partnerships
For advertising, affiliate or content collaboration enquiries, use the same email address with a clear subject line.
Response time
We aim to answer within three business days. Messages about privacy or legal matters are prioritised.
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