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General estimate for planning only — not medical advice. Consult a doctor about your specific situation.
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What does this calculator estimate?
The ideal weight calculator estimates a healthy weight range for your height using seven common formulas and a healthy-BMI range.
Why the formulas differ
The Hamwi, Devine, Robinson, and Miller formulas estimate ideal weight from height above 5 feet using different baseline weights and per-inch rates. Broca is simply height in cm minus 100, and Lorentz adds a height-based correction. Peterson instead targets a chosen BMI. Because they use different assumptions, they can vary by several kilograms — which is why showing all of them is more informative than any single number.
The healthy BMI range
A BMI between 18.5 and 24.9 is generally considered a healthy range for adults. Multiply the BMI by your height in meters squared to get the corresponding weight range. This is a population-level guideline; athletes and people with high muscle mass may fall outside it while still being healthy.
Using the result responsibly
Ideal-weight formulas are screening references, not prescriptions. A clinician considers body composition, waist measurement, medical history, and lifestyle. Use the range as a general orientation and discuss any weight goals with a healthcare provider.
The Devine formula, worked
The Devine formula (1974) is the most cited ideal body weight equation: men, 50 kg + 2.3 kg per inch over 5 feet; women, 45.5 kg + 2.3 kg per inch over 5 feet. Worked example: a woman who is 5 feet 6 inches tall stands 6 inches over 5 feet, so 45.5 + (6 x 2.3) = 59.3 kg, about 131 lb. A man of the same height: 50 + (6 x 2.3) = 63.8 kg, about 141 lb. The calculator applies these equations across every height and shows the range across all seven formulas, because the formulas disagree by design - Devine was built for drug dosing, not aesthetics.
How this calculator works
Formula
Devine: men 50 kg + 2.3 kg per inch over 5 ft; women 45.5 kg + 2.3 kg per inch. Robinson, Hamwi, and Miller adjust the base and per-inch factors.
Worked example
A 5 ft 9 in adult (175 cm): the four clinical formulas give 69.1 to 70.7 kg (152 to 156 lb), averaging about 70.2 kg.
Assumptions to verify
- Formulas are designed for adults and are general reference points, not medical targets.
- Height is entered in metric (cm) or US (ft/in), and sex is used where a formula is sex-specific.
- Body composition, frame size, and muscle mass are not accounted for.
- This tool provides general estimates for planning and education only; it is not medical advice and not a substitute for a qualified healthcare professional.
- Always consult your doctor or another healthcare provider about your specific situation.
Frequently asked questions
What is the ideal weight for my height?
It depends on the formula. For a 175 cm male, common formulas estimate roughly 68–75 kg, and the healthy BMI range is about 57–76 kg. This calculator shows all the major formulas plus the BMI range.
Which ideal weight formula is most accurate?
No single formula is clearly best. Hamwi, Devine, Robinson, and Miller are the most widely cited; Robinson and Miller tend to estimate lower, and Peterson lets you choose a target BMI. A clinician's assessment is more accurate than any formula alone.
How is the healthy BMI range calculated?
Multiply a BMI of 18.5 and 24.9 by your height in meters squared. For a 1.75 m person that gives about 56.7–76.3 kg.
Why do the formulas give different results?
They use different baseline weights, per-inch rates, and (for Lorentz) height corrections that were derived from different populations. The spread is normal and shows why a single number is misleading.
Is ideal weight the same as a healthy weight?
Not necessarily. 'Ideal' formulas estimate a reference weight from height and sex, while a healthy weight depends on BMI, body composition, and individual factors. Use the BMI range for a broader health-oriented picture.
Cite this tool
BoringToolsKit. “Ideal Weight Calculator.” boringtoolskit.com/ideal-weight-calculator/ (reviewed August 2026). Free to reference in articles, syllabi, and answer posts with a link.
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