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Ideal Weight Calculator

Enter your height and sex to see target-weight estimates from two classic clinical formulas, plus the full healthy BMI range.

How the formulas work

Both use the same shape: a base weight at 5 feet tall, plus a fixed amount per inch above that.

Below 5 feet the formulas are not defined, so this tool holds them at the base value and you should lean on the BMI range instead.

Worked example

A man 5 ft 10 in tall is 10 inches over 5 ft. Devine: 50 + 2.3 × 10 = 73 kg (161 lb). Robinson: 52 + 1.9 × 10 = 71 kg (156 lb). The healthy BMI range for that height is roughly 58–79 kg (129–174 lb) — so both formulas sit comfortably inside it, toward the middle.

Ideal weight by height (Devine)

HeightMenWomen
5 ft 2 in~55 kg / 121 lb~50 kg / 111 lb
5 ft 6 in~64 kg / 141 lb~60 kg / 131 lb
5 ft 10 in~73 kg / 161 lb~69 kg / 151 lb
6 ft 2 in~82 kg / 181 lb~78 kg / 171 lb

Use it alongside other checks

These formulas are height-only. Pair the figure with your BMI, your body fat percentage, and your waist-to-height ratio (keep your waist under half your height) for a picture that accounts for muscle and fat distribution, not just the scale.

Related tools

Frequently asked questions

Is there really one ideal weight?
No. These formulas give a single number per height for convenience, but a healthy weight is a range, and it depends on muscle mass, frame size, age, and health markers. Use the estimate as a reference point, not a target to chase precisely.
Where do the Devine and Robinson formulas come from?
Both were built for medicine — originally to size drug doses — not for fitness goals. Devine (1974) is the most widely cited; Robinson (1983) revised the constants using different data. They agree closely for average heights and diverge a little at the extremes.
How do these compare to BMI?
The formulas tend to land near the middle of the healthy BMI band for average heights. This tool also shows the BMI 18.5 to 24.9 weight range so you can see the spread.
My weight is outside the estimate — is that bad?
Not on its own. A muscular person can sit well above these numbers and be perfectly healthy. Waist size, fitness, and bloodwork tell you more than a height-only formula can.
Does frame size matter?
Some older formulas added a frame-size adjustment (small, medium, large, judged by wrist or elbow width), typically about ±10%. Devine and Robinson do not, which is one reason to treat their output as the centre of a range rather than an exact target.
What about the Hamwi and Miller formulas?
They are two more height-based formulas with slightly different constants. All four (Hamwi 1964, Devine 1974, Robinson 1983, Miller 1983) land within a few kilograms of each other for average heights. This tool shows Devine and Robinson plus the healthy BMI range, which brackets all of them.
Should I aim for my 'ideal weight'?
Aim for a weight where your health markers, energy and function are good and that you can maintain without a constant fight. That is often a band several kilograms wide. Use the ideal-weight figure and the healthy BMI range together as a sanity check, not a finish line.

Last reviewed: September 2026. Figures and formulas are checked against their published sources; see the site's data notes.