Contact Us
Have feedback, a bug report, or a calculator request? We would love to hear from you.
What can we help with?
Bug reports
If a calculator is giving incorrect results or something looks broken, let us know. Please include which calculator, what inputs you used, and what browser and device you are on. Screenshots help a lot.
Calculator requests
Want us to build a specific calculator? Tell us what it should do and why it would be useful. We prioritize tools that help the most people and are backed by established science.
Content corrections
If you spot incorrect information in our explanations, outdated references, or misleading claims, please let us know. Accuracy is our top priority and we appreciate corrections from knowledgeable readers.
Partnership and collaboration
If you are a fitness professional, nutritionist, researcher, or content creator interested in collaborating, we are open to conversations. We are especially interested in expert reviews of our calculator methodologies.
Privacy concerns
If you have questions about how your data is handled or want to exercise your rights under GDPR or CCPA, reach out and we will address your concerns promptly.
Before you reach out
Why are my results different from another calculator?
Different calculators use different formulas and assumptions. Our tools always show which formulas we use and typically display results from multiple equations. Small differences (within 5–10%) are normal and expected between methods. Check our formula comparison sections for details.
Is FitCalculator free?
Yes, completely free. We are supported by advertising revenue. All calculators are available without sign-ups, subscriptions, or paywalls.
Do you store my data?
No. All calculations happen in your browser. We never see, store, or transmit the numbers you enter. Read our privacy policy for full details.
Can I use FitCalculator content or embed calculators?
Please reach out to discuss usage. We are generally happy to support educational and non-commercial use with proper attribution.
We typically respond within 48 hours on business days.
For urgent issues, please include "URGENT" in your email subject line.