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Weight

Ideal Weight Calculator

Details

How to use Ideal Weight Calculator

What the tool does, how to run it, and what to expect from the result.

How to use an ideal weight calculator honestly

Enter your height in centimetres and select your sex. The calculator applies the Devine formula, which starts at 50 kilograms for men or 45.5 for women and adds 2.3 kilograms per inch over 5 feet, and it also shows the weight range that corresponds to a BMI of 18.5 to 24.9 at your height.

Read the second line, not the first. The Devine number is a clinical approximation from 1974 with no claim to being a healthy target, while the BMI range at least describes a span rather than pretending there is one correct weight for your height.

  • Enter your height in centimetres.
  • Select male or female, which sets the base constant.
  • Read the Devine figure with the knowledge that it was built for drug dosing.
  • Read the healthy BMI range underneath, which is the more useful of the two outputs.
  • If you are under 152.4 cm, ignore the Devine figure entirely, because the formula does not extend there.
Tips

Getting a better result out of Ideal Weight Calculator

Specific settings and thresholds, not general advice.

  • The Devine formula was published in 1974 to calculate drug doses, not to set a healthy weight. It was an approximation for working out how much of a medication a body of a given height needs, and it was never validated as a body-image or health target.
  • The maths is 50 kilograms for men or 45.5 for women, plus 2.3 kilograms for every inch of height over 5 feet. The imperial constants in a metric calculator are a fossil of exactly where the formula came from.
  • Because it works from inches over 5 feet, and that number is clamped at zero, anyone shorter than 152.4 cm gets the flat base figure of 50 or 45.5 kilograms regardless of how much shorter they are. The formula genuinely does not extend below 5 feet.
  • The healthy BMI range shown alongside it is the more defensible number: it is the weight span that puts you between a BMI of 18.5 and 24.9 at your height, and it is a range rather than a single point, which is how body weight actually works.
  • A single ideal weight is a fiction. Two people of the same height and sex can carry 15 kilograms of difference in muscle and skeleton and both be entirely healthy, which is why the range and not the point estimate is the useful output here.
Limits

What Ideal Weight Calculator does not do

The honest boundary, so you do not lose time finding it yourself.

  • Metric input for height only, in centimetres, with a two-option sex selector. There is no age, frame size, or body composition input.
  • The formula is undefined below 152.4 cm and returns the base figure there regardless, which makes it useless for shorter adults.
  • It gives one number rather than a range, which is not how healthy body weight works, and it takes no account of muscle mass.
  • It is arithmetic, not medical advice, and it is certainly not a target to diet towards without a clinician involved.
At a glance

Who Ideal Weight Calculator is for

A quick way to understand who this helps, what it solves, and where it connects next.

Best fit

People tracking fitness, nutrition, and everyday health goals.

Ideal for

A quick, private health estimate without an account or app install.

FAQ

Common questions

Short answers for the questions people usually have before trying a utility like this.

Is the ideal weight calculator free?

Yes. It is completely free to use, with no signup, no account, and no paywall.

Are the results medical advice?

No. The output is a general estimate built from standard formulas and population averages. For decisions about your health, diet, or training, check with a doctor or registered dietitian.

Does it stay local?

Yes. The height, weight, and other details you enter are processed entirely in your browser and never uploaded.

Why does a drug-dosing formula show up in a weight calculator?

Historical accident. Devine, Robinson, Miller, and Hamwi were all built to estimate lean body mass for clinical purposes, and they got picked up by fitness sites as ideal weight formulas. That repurposing is not something the original papers support.

Which number should I actually pay attention to?

The healthy BMI range, which spans the weights that put you between 18.5 and 24.9 BMI at your height. It is wide on purpose, because there is no single correct weight for a given height.

I am shorter than 5 feet and the number looks wrong. Why?

Because the formula adds weight per inch above 5 feet and has no term for going below it. The result is clamped at the base value, 50 kg for men and 45.5 kg for women, which is not a meaningful estimate for shorter adults.

Does it account for muscle?

No. It knows only your height and sex. A muscular person will always come out above their formula ideal weight, and that says something about the formula rather than about them.

Is anything sent to a server?

No. The calculation is a couple of lines of arithmetic running in your browser as you type.

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