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What to write about

A wrong result, a formula that does not apply to you, a source link that has gone dead, or an Arabic translation that reads oddly are all worth a message. So is a request for a calculator that does not exist yet. If you have seen a number on this site that you cannot reconcile with something credible, tell us which calculator and roughly what you expected.

What we cannot do

We cannot give medical advice, interpret your test results, or tell you what to do about a symptom. We are not clinicians and we cannot diagnose anything, including by email. Please raise those with a doctor or pharmacist.

We also cannot take down or change an advertisement on request, or answer for the content of a third-party advertiser's site.