Athletic Shorts Size Chart: How to Find Your Inseam and Fit

Find your athletic shorts inseam by measuring the inside leg from the crotch seam straight down to the hem, then matching that number to the brand’s own size chart.

Two numbers decide shorts fit: waist and inseam. Waist is easy. Inseam is where people guess, which is why a “medium” can arrive looking like bike shorts or knee-length cargo wear. Measuring takes about a minute; the rest is knowing sizing charts are brand- and style-specific, so the same 7-inch inseam sits differently on different bodies.

What the inseam number actually measures

Inseam is the inner leg seam, from crotch seam to bottom hem. Outseam runs along the outside from waistband to hem; mixing the two up is the most common sizing mistake.

Performance shorts swing wide here. Current charts list 4 1/2 in, 5 in, 5 3/4 in, 6 in, 6 1/2 in, 7 in, 9 in, and 9 1/2 in depending on model. Cuts for the same waist size — Quad-Cut, High-Cut, Above-Knee — push the range from roughly 4 1/2 in to 9 3/4 in.

adidas’ US men’s shorts and pants chart keys each size label to a specific inseam rather than one blanket number; the women’s shorts and leggings chart maps sizes to metric inseams such as 72–76 cm, 77–81 cm, and 82–86 cm. Read the chart for your garment category, not the one next to it.

How to measure your inseam in three steps

Lay shorts that fit flat on a table and run the tape straight down the inside leg seam. That’s your reference point for every brand.

1. Lay the shorts flat and smooth the inner leg seam so it runs straight without twists.
2. Place the tape at the crotch seam where the leg seams meet, and run it down the inside of the leg to the bottom hem.
3. Record the number in inches, then measure waist flat across the waistband and double it.

Measuring your body works too, but follow the inside leg from crotch to where you want the hem. Size guides stress keeping the tape vertical along the inner seam rather than wrapping the leg, since a wrap gives thigh circumference, not length.

For metric context, an inseam around 30 in to 30 1/2 in appears on some adidas men’s lines, while the women’s chart runs in centimeters. If your number lands mid-range, round shorter for a more athletic look, longer for coverage.

Why the same size fits differently across brands

“Medium” isn’t universal. Each manufacturer builds its own chart, and inseam and waist drift independently — a medium in one brand’s 5 in short may match another’s small in a 7 in cut.

Nike’s men’s chart handles height through tall bottoms sizing, covering 6’0″ to 6’5″ builds and adding 2 in of inseam and 1/2 in of rise over regular fit. That applies only to tall sizes, not standard shorts.

Athletic shorts commonly land in the 5–7 in range, with many makers offering 5, 7, and 9 in as core options. If a 5 in inseam works for you, anchor to it and check each brand’s chart. Our tested 5 inch inseam athletic shorts roundup covers specific picks.

Common measuring mistakes to avoid

Most sizing complaints trace to three errors: mixing up inseam and outseam, measuring over loose clothing, or assuming one brand’s length carries over.

• Outseam instead of inseam. The outseam runs along the outer thigh and reads several inches longer than you need.
• Measuring over baggy clothing. Fabric adds width and slack. Measure bare or against a flat garment.
• Trusting the size letter. Compare actual waist and inseam figures side by side.
• Wrapping the tape around the thigh. That gives circumference. Keep the tape vertical down the inner leg.

Chart details live on each brand’s sizing page, so verify numbers before ordering. adidas’ US men’s shorts and pants chart keys each label to a specific inseam; Nike’s men’s bottoms chart splits regular from tall. The measurement convention is the same everywhere: crotch seam to hem, straight down the inside leg.

FAQs

Is inseam the same as outseam?

No. Inseam measures the inside leg from crotch seam to hem; outseam runs down the outside from waistband to hem and reads several inches longer. Always measure the inside leg when matching a chart.

What inseam do most athletic shorts have?

Most performance shorts fall between 5 and 7 inches, and many manufacturers offer 5, 7, and 9 inch options. Shorter cuts near 3 to 4 inches show up mainly in running and track styles.

Does a medium fit the same across brands?

No. Each brand builds its own chart, so waist and inseam can differ noticeably between two mediums. Compare actual inch figures rather than the size letter alone.