The NumberTrove library
Health & fitness
calculators.
Explore common health and fitness estimates with the assumptions shown clearly. These tools are useful for general education and tracking, but they cannot replace an examination or advice from a qualified professional.
Choose the right health & fitness calculator
Treat every result as a screening estimate, not a diagnosis. Measurement technique, age, medication, training status, body composition, and medical history can materially change interpretation.
Every tool is free, browser-based, and includes its formula, assumptions, and related calculators. Use the links below to start with the result you need.
BMI calculator
Estimate adult body mass index from height and weight.
Health & fitnessBMR calculator
Estimate resting daily energy needs from age, height, weight, and sex.
Health & fitnessBody fat percentage calculator
Estimate body fat percentage from BMI, age, and sex.
Health & fitnessWaist-to-height ratio calculator
Compare waist measurement with height as a simple body-size screening estimate.
Health & fitnessTarget heart rate calculator
Estimate exercise heart-rate zones from age.
Health & fitnessVO2 max calculator
Estimate VO2 max from a one-mile walk field test.
Health & fitness