Contact
We read everything sent here, particularly error reports.
We aim to respond within a few business days.
What to reach out about
Report a factual error
Found a number, source, or claim that looks wrong? Tell us which guide and what you found — we check every report against our sources.
Suggest a data source
Know a public dataset we should be using? We're always looking to strengthen our sourcing.
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Everything else
Feedback on a calculator, a guide you'd like to see, or general questions about the site.