A healthy weight range, not one number
Four classic formulas and a BMI band — honest ranges, not verdicts.
Results update as you type 🥑
Why “ideal weight” is a range
There is no single ideal weight. The classic formulas (Robinson, Miller, Devine, Hamwi) were built for clinical dosing, not aesthetics, and they disagree by several kilograms — which is exactly why we show a range.
A healthy BMI band (18.5–24.9) for your height is usually the most useful guide for most people. Athletes with high muscle mass will sit above it without being “overweight”.
Treat the range as a sane neighbourhood, not a target. Body composition and how you feel and perform matter more than hitting a specific number.
Common questions
Which formula should I trust?
None exclusively. They were designed for medication dosing. Use the range and the healthy BMI band together as a sanity check.
Why do the formulas disagree?
They were derived from different populations and eras. The spread (often 5–8 kg) is normal and is why a range beats a single number.
Does this account for muscle?
No. A muscular person can be healthy above these numbers. Pair this with a body-fat estimate for context.
Is my data stored?
No. Everything is calculated in your browser. Nothing is sent to a server or saved.
Sources & references
- Mifflin MD, St Jeor ST, et al. “A new predictive equation for resting energy expenditure in healthy individuals.” Am J Clin Nutr. 1990;51(2):241–247.
- Frankenfield D, Roth-Yousey L, Compher C. “Comparison of predictive equations for resting metabolic rate in healthy nonobese and obese adults.” J Am Diet Assoc. 2005;105(5):775–789.
This calculator provides estimates for general educational use and is not medical advice. Consult a qualified professional before making significant dietary changes.