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Questions, corrections and suggestions are welcome. Email is the fastest way to reach us.

What we can help with

A correction to a formula, factor value or reference on the site.
A problem with the calculator not working in your browser.
A question about an article on the site.
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What we cannot help with

We cannot give veterinary advice, diagnose a condition, or recommend a specific diet for your pet. Those questions need a licensed veterinarian who can examine your pet. If your pet is unwell, is not eating, or you are worried about sudden weight change, please contact your veterinarian or an emergency clinic.

If your cat has stopped eating Cats that go without food for more than 24 hours can develop hepatic lipidosis (fatty liver disease), which is often fatal. Contact a veterinarian promptly.

We aim to reply within a few days. This site is run by one person, so thank you for your patience.