How this calculation works
This is a garment-fit heuristic with thresholds that you control. A difference within the balance tolerance groups bust and hip as balanced. The waist measurement then indicates how much shaping the pattern may need.
Balance = (bust − hip) ÷ max(bust, hip). Waist reduction = 1 − waist ÷ min(bust, hip).A worked example
With 94 cm bust, 72 cm waist and 98 cm hips, the bust and hips are within 5%. The waist is more than 20% smaller than the smaller of those two measurements.
Good to know
A pattern-fitting description. Brands and garments use different sizing and ease conventions.
How the inputs affect the result
Take all measurements over the same type of undergarment and hold the tape level without pulling it tight. Compare your circumferences with the finished garment measurements if they are available.
The same measurements can cross an editable boundary.
Where the calculation applies
A pattern-fitting description. Brands and garments use different sizing and ease conventions.
For a related calculation, see the Bra size starting label and conversion tool.
A few questions, answered
Can I switch to inches?
Yes. Enter all three measurements in inches together. The classification uses ratios and is unchanged when the unit conversion is consistent.
What does the “Tighter balance tolerance” setting illustrate?
The same measurements can cross an editable boundary.