Ideal Weight Calculator
Estimate your ideal body weight range using 4 established medical formulas — Devine, Robinson, Miller, and Hamwi. Free, no sign-up.
Pairs naturally with our BMI Calculator
See where you fall on the standard BMI scale too
Your Stats
These formulas were derived separately for male and female body composition.
Enter this to see how your current weight compares to the estimated range.
Formulas to Compare
Devine and Robinson are the two most widely referenced formulas in clinical and pharmacy settings.
Estimated Ideal Weight Range
155.2 lbs – 165.8 lbs
Average across selected formulas: 159.8 lbs
By Formula
For Context: Healthy BMI Range
Weight at BMI 18.5–24.9
129.2 lbs – 173.9 lbs
BMI's healthy range is typically wider than any single ideal-weight formula — the two are complementary, not identical, ways of estimating a healthy weight.
These formulas were originally developed to estimate medication dosing weight, not a personal fitness target — they don't account for muscle mass, frame size, or body composition. This tool is for general reference only, not medical advice. Talk to a doctor or registered dietitian about a weight goal that's right for you.
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Buy me a coffeeFree Ideal Weight Calculator — Devine, Robinson & Miller Formulas
Enter your height and sex to see an estimated ideal body weight range, calculated using four established medical formulas — Devine, Robinson, Miller, and Hamwi. These formulas were originally developed for clinical use (like calculating medication dosing), but they're widely used today as a quick reference point. This tool compares all four side by side and pairs naturally with our BMI Calculator for a fuller picture. Everything runs instantly in plain JavaScript, no sign-up required.
Where These Formulas Come From
All four formulas share the same basic structure: a base weight for someone 5 feet tall, plus a fixed amount added for every inch above that. They were developed decades apart by different researchers, which is why they don't always agree exactly — Devine (1974) remains the most widely used in clinical and pharmacy settings for dosing calculations, Robinson (1983) and Miller (1983) were refinements based on different population data, and Hamwi (1964) is one of the earliest versions still in common use.
💊 Originally built for dosing
Devine's formula, in particular, was designed to estimate a dosing weight for medications — not as a fitness or aesthetic target.
📏 Height-based only
None of these formulas account for muscle mass, bone structure, or frame size — they're a starting reference, not a precise target.
How to Use This Alongside BMI
Treat the range as a reference, not a target
A wide, healthy weight range is normal. These formulas give you a data point to consider alongside how you feel, your body composition, and your goals — not a number to chase exactly.
Compare it against your BMI
Your BMI's healthy range (18.5–24.9) is usually broader than any single ideal-weight formula. Looking at both together gives a fuller picture than either alone.
Muscle mass changes the picture
These formulas don't know whether your weight is muscle or fat. A muscular, athletic person may sit well above the calculated range and still be perfectly healthy.
Frame size matters too
People with a larger bone structure will naturally sit higher in a healthy weight range than people with a smaller frame at the same height.
Talk to a professional for a real target
If you're setting an actual weight goal, a doctor or registered dietitian can factor in your full health picture — these formulas can't.
Frequently Asked Questions
Which formula is most accurate?
None is definitively "most accurate" — they were derived from different populations and eras. Devine is the most widely referenced in clinical settings today, but comparing several at once (as this tool does) gives a more realistic range than trusting a single formula.
Why does my ideal weight range seem too narrow or too wide?
These formulas are height-based only and don't account for muscle mass or frame size, so the range can feel off for very muscular or very small/large-framed individuals. Use it as a general reference point, not an exact target.
How is this different from BMI?
BMI relates your weight and height into a single ratio with a broad healthy range (18.5–24.9). Ideal weight formulas instead calculate a specific weight or narrow range directly from your height and sex. They're complementary ways of looking at the same general question.
Were these formulas designed for fitness goals?
No — most, including Devine's widely used formula, were originally developed to estimate a dosing weight for medications in clinical settings. Their use as a general weight reference came later.
Should I use this to set a weight-loss goal?
It can be a helpful starting reference, but a real weight goal should factor in your full health picture, body composition, and personal circumstances — best done with a doctor or registered dietitian rather than a formula alone.
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