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Body Frame Size Calculator

Small, medium or large frame from your height-to-wrist ratio, with a frame-adjusted weight range.

Related tools

All Weight & body tools →
Body fat calculatorEstimate your body fat percentage (U.S. Navy method).Lean body mass calculatorEstimate your lean body mass and fat mass from weight, height and sex.Bra Size CalculatorBand and cup size (US, UK and EU) from your underbust and bust measurements.Body surface area calculatorCompute your body surface area (BSA) with the five published formulas — Mosteller, Du Bois, Haycock, Gehan & George and Boyd — side by side.Am I Overweight? CalculatorFind out if you're overweight from your BMI, with your healthy weight range and kg to reach it.Am I Underweight? CalculatorFind out if you're underweight from your BMI, with your healthy weight range and kg to reach it.Biological Age CalculatorEstimate your biological age from lifestyle factors — fitness, diet, sleep, stress and more. Educational, not medical.Child BMI Percentile CalculatorBMI-for-age percentile on the CDC reference, ages 2-20 — the percentile, not the BMI, is what counts for a child.

Body Frame Size Calculator is free to use as often as you like, directly from this page. Its place is under Weight & body; Body fat calculator and Lean body mass calculator answer the questions closest to this one.

How to use it

  1. Open the tool — no signup or install needed.
  2. Enter your input or adjust the available options.
  3. Get your result instantly, then copy or download it.

Frequently asked questions

What does Body Frame Size Calculator do?

Small, medium or large frame from your height-to-wrist ratio, with a frame-adjusted weight range.

When would I actually use this?

Getting a reference point before a check-up, setting a realistic target, and understanding why two people of the same weight can be in very different shape — and, the same act from the other side, putting a day's caffeine, salt, sugar or alcohol beside the ceiling a health body publishes for it.

What is the most common mistake?

Reading BMI as a measure of health. It cannot tell muscle from fat, which is why athletes routinely score as overweight and why it says little about an individual.

How is Body Frame Size Calculator different from Body fat calculator?

They sit next to each other but answer different questions: Body fat calculator is the one to open when you need it to estimate your body fat percentage (U.S. Navy method). Pick whichever matches what you're starting from — both are free.

Is there a tool for the next step?

Lean body mass calculator is the closest one after this: Estimate your lean body mass and fat mass from weight, height and sex.

What else is worth having open alongside it?

Bra Size Calculator and Body surface area calculator — they come up in the same task often enough to be worth a second tab.

Where do the figures come from?

The formulas are the published ones (Quetelet for BMI, Mifflin-St Jeor or Harris-Benedict for energy expenditure) and the tool names which it used. None of this is a diagnosis or a substitute for a clinician.

Further reading

All guides →
ExplainerBody Frame Size, and What Ideal-Weight Formulas AssumeFrame size exists because height alone does not fix skeletal mass, and the published methods are crude proxies with real cut-offs. The bigger story is the ideal-weight formulas: four of them, all built for drug dosing rather than health, disagreeing by up to 27 lb at the same height.ExplainerAm I Overweight? Why One Number Cannot SayBMI reads muscular bodies as heavy and cannot see where fat sits at all — which is exactly why the waist measures exist. Here are the published waist and waist-to-height thresholds, a worked case where BMI and waist give opposite answers, an honest account of the contested mortality curves, and the 2025 shift toward defining obesity by adiposity and organ function rather than by a ratio.ExplainerAm I Underweight? What the Question Is Really AskingThe 18.5 cut-off is a population screening line, not a diagnosis. Here is where it comes from, what the mortality data below it actually show, and the three things it cannot see: body composition, recent change — which is far more informative than the level — and the fact that the same line does not fit every age or every population.GuideBra Sizing Is Two Measurements and Four Incompatible SystemsThe band and the cup are computed differently in the UK, the US, the metric EU, the French and Spanish markets and Italy. One body, its four labels, and the arithmetic behind each.ExplainerWaist-to-Hip Ratio Explained: The Thresholds, and Where to Put the TapeWHO puts abdominal obesity at a ratio of 0.90 or more for men and 0.85 or more for women. But measuring in the wrong place changes the answer more than the threshold does — here is exactly where the tape goes.ExplainerBlood Donation Intervals, and What Your Body Is Actually ReplacingPlasma is back in a day, red cells in weeks, iron in months — and it is the iron that sets the interval. The arithmetic of a unit, and the minimum intervals published by seven national services.