Health calculators
BMI, BMR, TDEE, Navy tape, and LMP dating. Informational, not a diagnosis.
8 tools
In this group
Start with BMI. BMR and TDEE use Mifflin-St Jeor. Ideal weight lists Devine, Robinson, Miller, and Hamwi. Tape percent is Navy body fat. Pregnancy pages use LMP + 280 days only. None of these pages is medical advice.
- BMI Calculator BMI = kg / m². US units convert with 1 lb = 0.45359237 kg and 1 in = 0.0254 m. Informational, not a medical diagnosis.
- BMR Calculator Basal metabolic rate from Mifflin-St Jeor and revised Harris-Benedict. Optional Katch-McArdle if you type body fat. Not medical advice.
- Navy Body Fat Calculator US Navy circumference method. Metric tapes are converted to inches inside the formula. Informational, not an accession tape.
- Gestational Age Calculator Gestational age from LMP, estimated due date, and trimester. Same 280-day rule as the due-date page.
- Ideal Weight Calculator Devine, Robinson, Miller, and Hamwi ideal-weight formulas, plus the WHO BMI 18.5–24.9 band for that height.
- Lean Body Mass Calculator Lean mass from a body-fat percent you type, or Boer / James / Hume estimates from height, weight, and sex.
- Due Date Calculator Estimated due date as LMP + 280 days (Naegele), with gestational age and trimester. Not obstetric care.
- TDEE Calculator TDEE = Mifflin-St Jeor BMR × activity factor. All five common factors are listed. Not a diet prescription.