Body Frame Size Calculator
Find out whether you have a small, medium, or large body frame from your height-to-wrist ratio. Enter your sex, height, and wrist circumference to see your frame size and the reference ranges.
Formula
Frame = Height (cm) ÷ Wrist Circumference (cm)
Male: Small >10.4, Medium 9.6–10.4, Large <9.6
Female: Small >11.0, Medium 10.1–11.0, Large <10.1
- Frame size is judged from the ratio of your height to your wrist circumference, both in centimetres.
- Men: ratio above 10.4 is a small frame, 9.6–10.4 is medium, and below 9.6 is large.
- Women: ratio above 11.0 is small, 10.1–11.0 is medium, and below 10.1 is large.
- Measure the wrist at its smallest point, just below the wrist bone toward the hand.
- Frame size helps interpret ideal-weight targets — larger frames naturally carry more weight at the same height.
Man, 170 cm, 17 cm wrist
Inputs
- Sex: male
- Height: 170 cm
- Wrist Circumference: 17 cm
Ratio = 170 ÷ 17 = 10.0, which falls in the 9.6–10.4 band — a medium frame for a man.
Frequently asked questions
How is body frame size determined?
By dividing your height by your wrist circumference and comparing the ratio to sex-specific ranges for small, medium, and large frames.
Where do I measure my wrist?
Wrap the tape around the smallest part of your wrist, just below the wrist bone on the hand side.
Why does frame size matter?
It helps personalise ideal-weight estimates. People with larger frames carry more healthy weight at a given height than those with small frames.
Is frame size the same as bone density?
No. Frame size reflects skeletal width and build, not how dense or strong your bones are.
Can I change my frame size?
Not really — it is set by your skeletal structure. You can change muscle and fat, but not your underlying frame.
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