What Are The T-Shirt Sizes? | Charts, Fits, Conversions

T-shirt sizes run from XS to 5XL, and the best match comes from your chest measure, shirt length, and fit style.

Buying a tee sounds simple until the package arrives and the shoulders bite, the hem rides up, or the neck feels tight. Letters like S or L aren’t a universal unit. Brands set their own measurements, fabrics shift after washing, and cuts vary from snug to boxy.

This guide shows a clear sizing method you can use in minutes: learn what the letters usually mean, measure once, then match numbers instead of guessing.

What Are The T-Shirt Sizes? Size Labels Decoded

Most tees use letter sizes: XS, S, M, L, XL, then 2XL, 3XL, and up. Some labels add numbers or list measurements in inches or centimetres. Treat the letter as a starting point, then confirm with a chart.

Words You’ll See On Size Charts

Chest: the fullest part around the chest, under the armpits.
Body length: from the high point of the shoulder to the hem.
Shoulder width: seam to seam across the top.
Sleeve length: shoulder seam to the sleeve edge.
Fit: slim, regular, relaxed, oversized, or boxy.

T-Shirt Size Chart By Chest And Typical Fit

Use this table as a quick check when a listing shows only letter sizes. Measurements are body measurements, not the garment laid flat.

Letter Size	Typical Chest Range	Common Fit Notes
XS	31–34 in (79–86 cm)	Close to body, short sleeves
S	34–37 in (86–94 cm)	Trim through chest
M	37–40 in (94–102 cm)	Everyday, balanced cut
L	40–43 in (102–109 cm)	More room at torso
XL	43–46 in (109–117 cm)	Relaxed across shoulders
2XL	46–50 in (117–127 cm)	Often longer in body
3XL	50–54 in (127–137 cm)	Wider sleeves, fuller body
4XL	54–58 in (137–147 cm)	Extra room, longer hem
5XL	58–62 in (147–157 cm)	Big brand-to-brand swings

How To Measure For A T-Shirt That Fits

Measuring takes the drama out of sizing. Use a soft tape and stand relaxed.

Measure Your Body

Chest: wrap the tape around the fullest part, keep it level.
Waist: measure where the waistband naturally sits.
Torso length: measure from shoulder to the hem spot you like.

Next comes ease, which is the extra room that makes a tee feel wearable. A close tee often feels right with 1–2 inches of extra room at the chest. A relaxed tee often lands better with 3–5 inches.

Measure A Tee You Already Like

Lay a shirt flat and smooth it without stretching. Measure these points, then compare them to the product chart.

Chest width: pit to pit, then double it.
Length: shoulder seam to hem.
Shoulders: seam to seam across the back.
Sleeves: shoulder seam to sleeve edge.

Small Measuring Tweaks That Improve Accuracy

Keep the tape level and snug, not tight.
Take each measurement twice and use the closer match.
When measuring a tee, let it lie flat without tugging.

If your chest and waist sit in different ranges, use your favorite tee measurements as the tie-breaker.

Why The Same Size Can Feel Different

Two size-M shirts can fit nothing alike. Here are the usual causes.

Cut Choices

Unisex tees tend to be straighter through the waist. Women’s cuts may taper and shift the sleeve shape. Oversized tees often drop the shoulder seam and widen the sleeve opening.

Fabric And Shrink

Cotton can shrink, especially after a hot wash and tumble dry. Blends with polyester hold shape better. If you’ve been burned by shrink before, check care notes and plan for it.

Men’s, Women’s, Youth, And Unisex Sizing

A letter size can hide big shape changes. Unisex tees run straighter through the waist. Women’s tees often taper and change sleeve shape. Youth tees tend to be shorter in body length.

Quick Rules When Switching Categories

Unisex to women’s: check bust and waist, then confirm length.
Women’s to unisex: check shoulder width first.

How To Read A T-Shirt Size Chart Without Traps

Look for whether the chart uses body measurements or garment measurements. “Pit to pit” is garment width. “Chest” may be body measurement. The chart should say which one it is, with clear units.

Two Checks That Cut Returns

Measuring method: notes like “laid flat” tell you it’s garment sizing.
Tolerance: allow a small range from cutting and sewing.

When a chart lists garment width and length, you can see the cut in numbers and pick with confidence.

What Are T-Shirt Sizes By Region And Fit

Regional labels reuse the same letters, yet measurements can shift. When you buy across borders, charts that list centimetres or inches matter more than the printed letter.

Standards groups use body dimensions as the base. ISO publishes the measurement terms used in clothing sizing systems, shown on the ISO 8559-1:2017 size designation page.

Quick Cross-Border Notes

EU: number sizes may show up; good charts show centimetres.
US/Canada: many brands publish garment width, which helps a lot.
Japan: some cuts run shorter and narrower.

Use the size chart for the exact product. If there’s no chart, base your pick on the measurements from a tee you already like.

Choosing The Right Fit Style

Start with your chest number, then choose the look you want. Fit names tell you where the brand put the extra room.

Slim Fit

Slim tees sit closer through the chest and waist. Check shoulder width so the sleeve seam doesn’t creep inward.

Regular Fit

Regular fit tees skim the body without clinging. This cut is usually the safest pick when the chart is clear.

Relaxed And Oversized

Relaxed cuts add width. Oversized cuts often change the shoulder line and sleeve length. For that look, pick a tee designed oversized, not just a bigger size.

When To Size Up Or Size Down

Use fabric and cut to decide the direction.

Size Up When

The tee is 100% cotton and you use heat in the dryer.
The chart shows a slim cut with narrow shoulders.

Size Down When

The tee is designed oversized and the chart shows dropped shoulders.
The garment width sits far above your target chest ease.

Shopping Online Without Guessing

Online listings range from clean to vague. Use this routine before you buy.

Four Checks That Catch Most Mistakes

Body or garment measurements: know which one you’re reading.
Units: keep everything in inches or everything in centimetres.
Fabric mix: cotton, blends, or stretch change how a tee sits.
Care notes: drying heat can change the fit.

Next, scan the product photos for proportions. Look at where the shoulder seam lands, how the sleeve opens, and where the hem hits on the model. If the listing gives the model’s height and the size worn, treat that as a scale reference. Reviews can help when they mention measurements (“5’10”, 40-inch chest, wore L”). Ignore vague lines like “runs small” without numbers. When you see repeated comments about shrink, treat the care notes as a warning and size accordingly. Zoom in on the collar and stitching; those details hint at stretch and drape.

Care labels exist for a reason. In the US, the FTC Care Labeling Rule lays out what care info must be on the label, which can hint at shrink risk.

Common Size Problems And Fast Fixes

Even with careful measuring, a tee can land slightly off. These quick fixes can save a purchase.

Neck Feels Tight

Pick a crew neck with a wider opening, or switch to a V-neck.
Check if the listing calls it a narrow collar.
Match shoulder width instead of sizing down.

Shirt Is Too Short

Look for tall sizing if offered.
Compare body length to a tee you like.
Choose a blend if cotton shrink keeps happening.

Body Feels Baggy

Switch from relaxed to regular cut before you drop a full size.
Check that the hem width isn’t far wider than your chest.
If sleeves balloon, look for a straighter sleeve opening.

Second Table: A Simple Pick Method

Use this table when you want a quick path from your situation to a clear choice.

Your Situation	What To Check	Next Step
Between two letter sizes	Chest ease and shoulder width	Choose by the fit you like
Buying a new brand	Garment width and length	Match a tee you already like
Buying across regions	Centimetres or inches on chart	Ignore the letter, follow the numbers
Worried about shrink	Fabric mix and care notes	Size up or pick a blend
Want a neat shoulder line	Shoulder seam width	Pick the shoulder first, then chest
Want an oversized look	Dropped shoulders and sleeve length	Choose an oversized cut by design
Buying for printing	Fit, fabric weight, and length	Order one sample, then scale

Final Checklist Before You Order

Measure your chest once and save the number.
Measure a tee you like and save those numbers too.
Pick the fit style first, then pick the size.
Match shoulder width when you want a clean line.
Check care notes when shrink has bitten you before.
Follow the product measurements, not the letter, when they conflict.

If you still wonder “what are the t-shirt sizes?” after doing this once, save your measurements and you’ll answer it fast next time. When a listing feels vague, ask again: “what are the t-shirt sizes?” in numbers, not letters.