Workout Pants for Women Sizing Guide | Measure Waist, Hips & Inseam

Nothing kills a workout faster than leggings that slide down mid-squat or joggers that puddle at the ankle. The fix for workout pants for women sizing is simple once you know the system: grab a tape measure, take three body measurements, and compare them to that specific brand’s chart. Dress sizes mean almost nothing here — a size 8 in one brand can match a size 6 in another. Here’s how to get it right the first time, every time.

Which Measurements Actually Matter?

Three numbers decide how any pair of women’s workout pants will fit: your waist, your hips, and your inseam. Brands like Nike and adidas build their entire sizing systems around these three, plus height on some charts.

Waist is measured at your natural waist or its narrowest point — that’s the dip above your belly button, not where your jeans sit. Hips go around the fullest part of your seat, feet together, tape held level. Inseam runs from the crotch seam down to the hem, ankle, or floor, depending on what the chart asks for; some brands suggest measuring a well-fitting pair of pants along the inner seam instead.

One detail most people skip: measure in the underwear you’ll actually train in. Some brands recommend allowing one finger under the tape for a little breathing room. Too-tight measuring is the most common mistake, and it leads to pants that feel fine standing up and unbearable the moment you bend.

How To Measure: A Step-By-Step Walkthrough

Set aside five minutes and a soft measuring tape — a fabric one, not a metal contractor’s tape. Wear fitted undergarments, stand straight with feet together, and keep the tape horizontal the whole way around. Don’t suck in, and don’t pull the tape snug; it should rest against your skin without digging in.

1. Waist: Wrap the tape at your natural waist or narrowest point, typically an inch or two above the belly button. Breathe normally and read the number.
2. Hips: Wrap the tape at the fullest part of your hips and seat — usually around 7–9 inches below your waist. Keep the tape level front and back, and stand naturally rather than flexing.
3. Inseam: Run the tape from the crotch seam straight down the inner leg to the hem. If your target pants have a specific length (ankle, full-length, 7/8), measure to that point rather than the floor.

Write all three numbers down, then open the brand’s size chart — not a general “women’s sizes” chart from a random site, but the chart on the product page or the brand’s official size-guide page. Compare your measurements to that chart, not to the size you wear in jeans.

When you land squarely between two sizes, the right call depends on the fit you want. Nike’s guidance says size to the smaller size for a tighter, more compressive feel, or the larger size for a looser fit. If your waist and hip measurements point to different sizes, Nike recommends going with the hip measurement — that’s the number that keeps pants from pulling across the seat. Carhartt takes a simpler stance on its women’s pants guide: buy the larger size when you’re between sizes.

Brand Size Charts For Women’s Workout Pants: Real Numbers

Every brand runs its own chart, and the differences are bigger than most people expect. Here’s how three major brands compare for women’s bottoms. All measurements are in inches.

Notice how a 29-inch waist fits size S in Nike but lands squarely in M for Carhartt. That’s exactly why the brand’s own chart always wins over any universal size assumption. Carhartt also splits its inseams into Short (29–30″), Regular (31–32″), and Tall (33–34″), while FILA lists a flat 32″ inseam across all sizes — one more reason to check the specific garment’s numbers. adidas adds height to its women’s pants measurement list, so be ready to take that fourth number for their styles.

Before you measure anything, check what kind of pant you’re buying. Joggers, open-bottom pants, leggings, and slim-straight cuts all use different inseams and fit standards — the waistband might fit while the length is completely wrong. If you’re still unsure which style suits your training, our tested roundup of the best workout pants for women breaks down the top picks by activity and fit.

Common Sizing Mistakes That Ruin The Fit

Even with a chart in hand, a few errors keep sending women back to the returns counter. The biggest one is measuring at the wrong waist point — most official charts use the natural waist or narrowest point, not where high-rise leggings sit. Sucking in or pulling the tape tight skews everything by an inch or two. Skipping the inseam entirely means you might nail the waist and still end up with ankle-grazers. And leaning on your usual dress size instead of the brand’s chart ignores the fact that every brand maps numeric sizes differently. A quick measurement check with Nike’s women’s pant measuring guide takes five minutes and eliminates most of these issues before you order.