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We're here to help. Write to us about any query, suggestion or error you've found and we'll reply as soon as possible.
💡SuggestionsNew calculators or improvements to existing ones
🐛ErrorsIncorrect figures or unexpected behaviour
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Response time
We aim to reply within 24–48 hours on working days. Messages sent over the weekend may take a little longer.
Before writing to us
Check whether your question is already answered in the FAQ section of the relevant calculator. Most common questions are covered there.