Body Frame Size Calculator

Discover if you have a small, medium, or large body frame using the wrist circumference or elbow breadth method — and find your ideal weight range.

Imperial
incm
Metric

Your Measurements

ftin

Wrist Circumference Method 1

Wrap a tape measure around the smallest part of your wrist, just below the wrist bone. Keep the tape snug but not tight.

Elbow Breadth Method 2

Raise your arm forward to horizontal, bend your elbow 90°, palm facing up. Measure the distance between the two prominent bones on each side of your elbow.

Wrist Circumference Method
Medium

You have an average bone structure typical for your height and sex.

Ideal Weight Range (Hamwi)
Recommended Weight
—
lbs
Reference Chart
Learn More

Body frame size refers to the size of your bone structure — not your weight or muscle mass. It reflects the density and breadth of your skeletal frame and is classified as small, medium, or large.

  • Small frame — finer, narrower bones; naturally lighter build
  • Medium frame — average bone structure for your height and sex
  • Large frame — broader, denser bones; naturally heavier even at a healthy weight
  1. Use a flexible tape measure or a piece of string + ruler.
  2. Wrap it around the smallest part of your wrist — just below the wrist bone (distal end of the radius).
  3. Keep the tape snug but not pinching. Don't compress the skin.
  4. Record the measurement to the nearest 0.1 cm or 0.1 inch.

Tip: Measure your dominant wrist (right if right-handed) for the most consistent results.

  1. Raise your right arm forward to horizontal (parallel to the floor).
  2. Bend your elbow 90° upward so your forearm is vertical.
  3. Turn your palm toward your face.
  4. Place your thumb and index finger on the two bony prominences on the inside and outside of your elbow.
  5. Measure the distance between those two points with a ruler or calipers.

Note: This method is used in standard NHANES health surveys and is considered more accurate than the wrist method.

  • Ideal weight: Two people with the same height can have very different healthy weights based on frame size. A large-framed person naturally weighs more.
  • BMI limitations: BMI ignores frame size, which is why it can misclassify muscular or large-framed people as overweight.
  • Clinical use: Clinicians use frame size to set individualized healthy weight targets using methods like Hamwi.
  • Fitness goals: Understanding your frame helps set realistic body-composition and weight targets.

The Hamwi method (1964) is a clinical formula used to estimate ideal body weight:

  • Men: 106 lbs for 5 ft, plus 6 lbs for each additional inch over 5 ft
  • Women: 100 lbs for 5 ft, plus 5 lbs for each additional inch over 5 ft

Frame size adjustments:

  • Small frame: −10% from baseline
  • Medium frame: baseline (no adjustment)
  • Large frame: +10% from baseline

A ±5 lb range is added to allow for natural variation.