Body Frame Size Calculator
Sorts your build into small, medium or large from the size of your wrist.
Share sends a link that reopens these numbers. Copy details pastes the full breakdown as a list.
The formula
r = height ÷ wrist men: small above 10.4, medium 9.6–10.4, large below 9.6 women: small above 11.0, medium 10.1–11.0, large below 10.1
Use the same unit for both. A higher ratio means a slimmer wrist for your height.
What to watch out for
These ratio bands are a long-standing rule of thumb from nutrition reference tables, not the result of a modern study. MedlinePlus, from the US National Library of Medicine, publishes a different chart based on height and wrist size, which can give a different answer near the edges.
Frequently Asked Questions
What frame is a 17.5 cm wrist at 175 cm?
The ratio is 10.0, which is a medium frame for a man and a large frame for a woman.
What wrist counts as medium at 175 cm?
For men, 16.8 to 18.2 cm. For women, 15.9 to 17.3 cm.
What is frame size used for?
Mainly to adjust height-based weight estimates up or down, as in the common 10% adjustment to the Hamwi figure.