Email us
Write to zhuzhoujun1@gmail.com with anything about the site. We usually reply within two business days. To help us fix a calculation issue quickly, please include the exact inputs you entered and the result you saw.
We do not use a contact form because it would require a server that stores your messages — and FitCalc has no servers. Email keeps everything on your terms.
Common questions
I think a result is wrong. What should I do?
Every calculator page shows the exact formula it uses, so you can verify the math by hand first. If it still looks off, email us the inputs and result — most reports turn out to be rounding or an unusual edge case, and the rest we fix quickly.
Can you add a calculator?
Yes — tool suggestions are welcome, especially for training and nutrition. We build each tool with a published formula and clear documentation before it goes live.
Do you store my numbers?
No. All calculations run in your browser and nothing is transmitted or saved. See the Privacy Policy for details.
Is FitCalc affiliated with calculator.net?
No. FitCalc is an independent project. Our tools use the same publicly documented, peer-reviewed formulas that reference calculators also use.