Body Frame Size Calculator
Wrist circumference against height — the standard frame proxy.
Measurements
Your frame
What frame size does and does not explain
Frame size estimates skeletal build from the ratio of height to wrist circumference. The wrist is used because it carries almost no muscle and very little fat, so its circumference is close to a direct reading of bone structure — one of the few measurements on the body that is.
The ratio runs counter-intuitively: a higher ratio means a smaller frame, because the wrist is small relative to height. For men, above about 10.4 is small and below 9.6 is large; for women, above 11.0 is small and below 10.1 is large. Elbow breadth is the other common method and is somewhat more accurate, though it needs callipers rather than a tape.
Its genuine use is adjusting ideal-weight ranges, where a large-framed person sits legitimately higher than a small-framed one at the same height — often by several kilograms. What frame size does not explain is a body composition problem. It shifts a healthy range by a modest amount; it does not account for a BMI well outside the normal band, and "big-boned" covers far less ground than it is usually asked to.
Medical disclaimer. This calculator is for general information and education only. It is not medical advice, not a diagnosis, and not a substitute for professional care. Frame size adjusts a healthy weight range modestly and does not account for body composition or a BMI substantially outside the normal band.Speak to a doctor or another qualified clinician about any health decision.Last reviewed .
Frequently asked questions
How do I measure my wrist?
Around the smallest part of the wrist, just below the wrist bone on the hand side, with the tape snug against the skin. Use your dominant hand for consistency, and measure the same way each time.
Why does a higher ratio mean a smaller frame?
Because the ratio is height divided by wrist circumference. A small wrist relative to a given height produces a large ratio, which indicates a light skeletal build.
Does frame size change what I should weigh?
Modestly. A large frame legitimately supports a few more kilograms at the same height than a small frame does, which is why some ideal-weight tables adjust for it. The adjustment is measured in kilograms, not in BMI categories.
Is wrist or elbow measurement better?
Elbow breadth is generally considered slightly more accurate, since it reflects joint structure more directly. It requires callipers, though, while the wrist needs only a tape — which is why the wrist method is far more widely used.
Can I change my frame size?
No. Skeletal structure is fixed once growth finishes. Muscle and fat change what you look like and what you weigh, but the underlying frame does not change.