HealthCalc
56 health and fitness calculators — BMI, body fat, TDEE, GLP-1 tracking, Army fitness testing — each backed by a cited formula rather than a black box. No account, no paywall.
The constraint
Health calculators online are mostly ad-farms: the number appears, the formula behind it does not, and the page wants an email before it will tell you anything. The arithmetic is trivial — the trust is the hard part.
The approach
Every calculator names the formula it uses and links the source. Nothing is gated, nothing requires an account, and the unit system is a first-class toggle rather than an assumption baked into the inputs.
Outcomes
- 56 calculators, each showing its underlying formula
- Metric and imperial as a global toggle, not per-form
- No account required for any calculator
- Guides alongside the tools so the number has context
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