Panty Size Calculator
Underwear is sized from two measurements, and the hip is the one that decides. Enter your natural waist and fullest hip, and the calculator returns your size, automatically sizing up when your waist runs ahead of your hips, the case where most people get uncomfortable fits.
As always here, the math runs in your browser and nothing is stored.
Runs entirely in your browser. Nothing you enter is stored or sent anywhere.
Why hips outrank waists in underwear sizing
A panty has to travel over your hips and then stay put at whatever height its cut targets; the hip measurement determines whether the garment physically fits, while the waistband elastic accommodates a range of waists. Sizing to a smaller waist number when your hips measure larger produces the classic failures: rolling waistbands, riding at the back and dig lines at the leg opening.
Cut changes the height where measurements matter: briefs sit at the natural waist, hipsters and bikinis at the mid-hip, so the same person can wear different printed sizes across cuts of one brand. When between sizes in any cut, take the larger; elastic forgives down, never up.
Frequently asked questions
Last updated August 2026.