What size period underwear am I with 50-inch hips?

It depends on the brand. A 50-inch hip spans XL, 2X, 3X, 4X, or 5X across the brands that publish a chart, because each brand draws its own. The table above gives your size at each one, with a note on brands that run small or large.

Do all brands use the same size for 50-inch hips?

No. That is the whole problem this page solves. The same 50-inch hip maps to 5 different sizes because there is no shared standard - each brand sizes on its own chart, and some run small or large on top of that. Match your hip to each brand's own chart rather than carrying one brand's size to another.

How do I measure my hip for period underwear?

Take a soft tape around the fullest part of your hips and seat, level with the floor, and keep it snug but not tight. That one number is what maps to a size on each brand's chart. Period underwear seals at the hip and seat, so it is the measurement that decides leaks - not your waist or usual size.

What size period underwear for 50-inch hips?

Your size at every brand that publishes a chart, read from one 50-inch hip measurement - because the same hip is a different size at different brands.

From each brand's own published size chart · Updated 2026-06-05

The short answer

A 50-inch hip lands in XL, 2X, 3X, 4X, or 5X depending on the brand - a 5-size spread on one measurement. That is why "I'm usually a Medium" is how people end up with a leaky pair.

Your size at each brand

Brand	Your size	How this brand runs
Knix	XXXL (3X)	Runs small and you are near the top of XXL (2X) - XXXL (3X) likely fits better.
Thinx	2X	True to size.
Modibodi	18/4XL	Sizing direction not confirmed by the brand; order your usual size.
Saalt	2XL	Order your usual size.
Proof (Proof by Always)	2XL	Order your usual size.
Ruby Love	4XL (US 24)	True to size.
Aisle	3X	Runs small and you are near the top of 2X - 3X likely fits better.
WUKA	5XL	Sizing direction not confirmed by the brand; order your usual size.
Rael	XX-Large (reusable, numeric 10-16)(nearest)	Runs small - size up if you are between sizes.
Hanky Panky	XL(nearest)	Order your usual size.

"Nearest" means the hip fell just outside a published range and we show the closest size. Every size here is read from the brand's own current chart; the runs-small and runs-large notes come from the brand's stated direction and repeated reviewer reports.

Brands without a numeric chart

The Period Company, Bambody do not publish a hip-based size chart, so they are not in the table. These brands generally run true to size or small - go by your usual size and their fit notes, and size up if you are on the edge.

Why one hip is several sizes

There is no shared sizing standard for period underwear. Each brand fits to its own model and draws its own chart, so a 50-inch hip can be a Medium at one brand and a Large at another. On top of that, some brands are known to run small or large against their own labels, which shifts the answer again. Carrying one brand's size to the next is the most common way people end up with a pair that gaps and leaks at the legs.

The fix is to read your hip against each brand's own chart, which is what this page does, and to size up when you are between sizes - a snug seal beats a loose one for a leakproof gusset.

49-inch hips All hip sizes 51-inch hips

Quick answers

What size period underwear am I with 50-inch hips?: It depends on the brand. A 50-inch hip spans XL, 2X, 3X, 4X, or 5X across the brands that publish a chart, because each brand draws its own. The table above gives your size at each one, with a note on brands that run small or large.
Do all brands use the same size for 50-inch hips?: No. That is the whole problem this page solves. The same 50-inch hip maps to 5 different sizes because there is no shared standard - each brand sizes on its own chart, and some run small or large on top of that. Match your hip to each brand's own chart rather than carrying one brand's size to another.
How do I measure my hip for period underwear?: Take a soft tape around the fullest part of your hips and seat, level with the floor, and keep it snug but not tight. That one number is what maps to a size on each brand's chart. Period underwear seals at the hip and seat, so it is the measurement that decides leaks - not your waist or usual size.

Not sure of your hip measurement?

The size finder takes your hip and returns your size at every brand at once, with the runs-small and runs-large notes built in. It computes in your browser - your measurement is never sent anywhere.

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