Free Health & Fitness Calculators
BMI, daily calories, and running pace — calculators that state their formulas and assumptions plainly. Informational only: nothing here is medical advice.
About these tools
The Health section brings Tallyloom's show-your-work approach to the most-searched fitness math: body mass index from height and weight, daily calorie needs using the Mifflin-St Jeor equation, and running pace with per-mile and per-kilometer splits.
Each calculator names the formula it uses and the assumptions behind it, because health numbers without context are easy to misread — BMI, for example, is a screening measure that doesn't distinguish muscle from fat.
These tools are informational only. They can't account for your medical history, and they are not a substitute for advice from a doctor, registered dietitian, or other qualified professional. Everything runs in your browser — your measurements are never uploaded.
Frequently asked questions
Are these calculators medical advice?
No. They implement standard published formulas for general information. For decisions about your health, weight, or training, consult a qualified professional who knows your history.
Which calorie formula do you use?
The Mifflin-St Jeor equation, generally regarded as the most accurate of the common BMR formulas for the general population, multiplied by a standard activity factor to estimate total daily energy expenditure (TDEE).
Is my health data private?
Yes. Height, weight, and everything else you enter is processed entirely on your device and never sent anywhere.
Looking for something else? Try Converters · Education & Study or browse all tools.