Ideal Body Weight
Ideal weight from multiple formulas
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Working out ideal weight from multiple formulas is easier with Ideal Body Weight, which answers as you type. You supply Height (cm) to Ideal Body Weight; the answer follows at once. Ideal Body Weight displays each intermediate figure as well. Ideal Body Weight works for one check or many. Nothing typed into Ideal Body Weight leaves your device or the tab. Ideal Body Weight sits in the Health section next to related tools and ideal body weight calculator ibw hamwi devine. Ideal Body Weight has no learning curve. The fields are labeled. Ideal Body Weight answers the next Health question you meet.
What the defaults give
A man of 175 cm has an average ideal body weight of about 70.5 kg.
The three classic formulas disagree a little: 72.0 kg (Hamwi), 70.5 kg (Devine) and 68.9 kg (Robinson).
The three formulas
Height is converted to inches first (175 cm = 68.9 in), then each formula adds a fixed base for the first five feet and a per-inch increment:
- Hamwi: 48.0 + 2.7 × (inches over 60)
- Devine: 50.0 + 2.3 × (inches over 60)
- Robinson: 52.0 + 1.9 × (inches over 60)
At 68.9 inches: Hamwi gives 72.0 kg, Devine 70.5 kg, Robinson 68.9 kg. The average is 70.5 kg.
Worked examples
175 cm man → 68.9–72.0 kg, average 70.5
160 cm woman → roughly 52–56 kg
180 cm man → roughly 72–75 kg
165 cm woman → roughly 54–58 kg
Where these formulas come from
All three were built for clinical drug dosing, not for setting personal targets. Devine's equation came from a 1974 study of hospital patients and was intended to give a rough lean-body-weight figure for calculating doses, not to tell anyone what to weigh. None of them adjust for frame size, age or body composition.
Why the number is a poor goal
- It ignores muscle. A 175 cm athlete at 78 kg with low body fat is not overweight, but these formulas would call it above ideal.
- It ignores frame. Wrist circumference and shoulder width change what is healthy at the same height.
- It ignores age. Weight that is healthy at 25 may be underweight at 70.
- Body mass index is a better screen for population health, though it shares the muscle blind spot.
Use the range to understand where the clinical anchors sit, not as a target. Waist circumference and body-fat percentage say more about health than a single ideal figure.
Formula weights are population averages and were never meant as individual targets. The result of 70.5 kg for a 175 cm man sits inside a range of roughly 68.9 to 72.0 across the common formulas, and none of them account for muscle mass, frame size or age. A muscular athlete can sit above the range while leaner than average, which is why body composition and waist measurement say more than a single target weight.
Frequently Asked Questions
What is the ideal weight for 175 cm?
The three formulas average about 70.5 kg for a man, spanning 68.9 kg to 72.0 kg depending on which one you use.
Why do the formulas disagree?
They were derived from different patient populations and fitted with different bases and per-inch increments, so they diverge by a few kilograms.
Are these formulas meant for weight goals?
No. They were built for clinical drug dosing. They do not account for muscle, frame size or age.
What about women?
The female equations use a lower base of about 45.5 kg, giving a figure roughly 5–8 kg below the male result at the same height.
Is BMI or ideal weight better?
BMI for population screening, since it is validated against health outcomes. Ideal-weight formulas are useful mainly for dosing.
Does frame size matter?
Yes, and none of these formulas account for it. Wrist circumference is the usual quick proxy for skeletal frame.
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