Compare four established adult IBW formulas
Formula comparison
Ideal-weight formulas were developed for clinical estimation and do not account for muscle mass, body composition, or frame size. Treat the results as references, not targets.
Evidence-based guide
Ideal body weight (IBW) formulas were created largely for clinical dosing and population estimates—not to define how a person should look. Comparing several formulas is more informative than treating one number as a universal target.
Originally proposed for medication dosing; it starts at a base weight at five feet and adds weight for each additional inch.
Later formula variants that use different base weights and increments, producing slightly different estimates.
A commonly cited clinical rule of thumb based on sex and height above five feet.
The calculator reports four estimates side by side and a broader BMI-based range. Differences between formulas are expected. Body composition, frame size, ethnicity, disability, age, and athletic development are not fully represented.
These adult formulas should not be used as growth targets for children or teenagers. They also cannot distinguish muscle from fat and may be misleading for strength athletes, pregnant people, or people with fluid retention.
No. Health cannot be reduced to a single weight, and all IBW formulas are approximations.
They were developed from different assumptions and use different base weights and per-inch adjustments.
Most classic IBW equations do not include age. Age can still influence muscle mass, bone density, and appropriate health goals.
Not necessarily. Discuss personal targets with a qualified clinician who can consider body composition and medical history.
