Ideal Weight Range Calculator
This free ideal body weight calculator for my height estimates your healthy weight range from just your height and sex, using four published formulas — Devine, Robinson, Miller, and Hamwi — plus a BMI-based healthy range for comparison. Results update instantly in both kilograms and pounds.
Enter your numbers
Your results
Enter your height to see your ideal weight range.
How to use this calculator
Enter your height in feet and inches, pick your sex, and choose one of the four formulas. Every number recalculates instantly as you change inputs — no need to press Calculate. The formula result is the single "ideal" number the chosen formula produces, while the ±10% band is the range most clinicians actually work with, since nobody has a single exact ideal weight.
Use the formula selector to compare approaches: Devine, Robinson, Miller, and Hamwi disagree with each other by several kilograms for the same person, and seeing that spread is the honest point of the tool. The BMI-based healthy range below gives you a second, independent reference — the weight that puts your body mass index between 18.5 and 24.9.
Pair your result with other health numbers for context: the body fat calculator estimates body composition, which height-only formulas ignore, and the TDEE calculator finds the calorie intake that maintains any weight you choose.
How it works
All four formulas start from a baseline weight at 5'0" (60 inches) and add a fixed amount per inch above 60. With h = total height in inches:
Devine: male 50 + 2.3 × (h − 60) · female 45.5 + 2.3 × (h − 60)
Robinson: male 52 + 1.9 × (h − 60) · female 49 + 1.7 × (h − 60)
Miller: male 56.2 + 1.41 × (h − 60) · female 53.1 + 1.36 × (h − 60)
Hamwi: male 48 + 2.7 × (h − 60) · female 45.5 + 2.2 × (h − 60)
For example, a 5'10" man (h = 70) on Devine: 50 + 2.3 × 10 = 73 kg, which is 73 × 2.20462 = 160.9 lb. The ±10% healthy band is 0.9 × 160.9 = 144.8 lb to 1.1 × 160.9 = 177.0 lb.
The BMI-based healthy range is separate math: the weights that put your BMI between 18.5 and 24.9, i.e. 18.5 × m² to 24.9 × m², where m is your height in meters. For the same 5'10" man: 1.778 m → 18.5 × 1.778² ≈ 58.5 kg (128.9 lb) to 24.9 × 1.778² ≈ 78.7 kg (173.5 lb).
Important: these formulas are population estimates, not medical advice. They were originally designed for drug dosing, not health judgments — they ignore muscle mass, age, ethnicity, pregnancy, and medical conditions, so a muscular athlete can land "overweight" while someone with real metabolic risk lands "ideal". Talk to a doctor or qualified clinician before making any weight, diet, or exercise decisions based on these numbers.
Frequently asked questions
Which ideal weight formula is best?
There is no single 'best' formula — Devine, Robinson, Miller, and Hamwi are all population estimates originally designed for drug dosing, not fitness. Devine is the most widely used in clinical practice. Use the formula selector above to see how much your number moves; the spread itself shows these are rough estimates, not exact targets.
Why do men and women get different ideal weight results?
The formulas use different baseline constants for men and women because, on average, men carry more lean body mass at the same height. Your individual body composition — muscle mass, bone density, medical conditions — is not captured by height and sex alone, which is why the result is a range, not a verdict.
What does the ±10% healthy range mean?
Many clinicians treat ideal body weight as a band about ±10% around the formula result rather than a single number. For example, a 5'10" man's Devine ideal of 73 kg (160.9 lb) gives a ±10% range of roughly 144.8–177.0 lb. This ideal weight range calculator also shows the BMI-based healthy range (BMI 18.5–24.9) as a second, independent reference.
Is this ideal weight calculator medical advice?
No. These formulas are population-level estimates that ignore muscle mass, age, ethnicity, and health conditions — they can mislabel a muscular athlete as overweight and miss real health risks. They are for general information only. Talk to a doctor or qualified clinician before making any weight or nutrition decisions.