Body Frame Size Calculator
Determine your body frame size using the height-to-wrist-circumference ratio method.
Why frame size matters for weight goals
Ideal weight charts and BMI categories are often based on averages that don't account for individual skeletal frame size — someone with a larger bone structure will naturally weigh more at the same body fat percentage than someone with a smaller frame, which is part of why frame size is sometimes used to adjust weight targets.
This calculator uses the wrist circumference method, one of several simple approaches to estimating frame size without specialized equipment, based on the ratio between height and wrist measurement.
How to measure wrist circumference correctly
Measure around the wrist at the narrowest point, just below the wrist bone (where a watch typically sits), using a flexible tape measure snug but not compressed against the skin.
Like other simple anthropometric methods, this is a useful general estimate rather than a precise clinical measurement — it's most useful as one data point alongside other body composition information, not as a standalone diagnostic tool.
Frequently asked questions
Does frame size change how much I should weigh?
It's one factor some ideal-weight frameworks consider — a larger frame generally supports a somewhat higher healthy weight than a smaller frame at the same height, though it's just one of many relevant factors.
Where exactly should I measure my wrist?
At the narrowest point of the wrist, just below the wrist bone — roughly where a watch strap would sit — using a flexible tape measure snug against the skin.