How To · Fashion · Men's Style
Find Your Correct Shirt Size in Three Measurements
Most men wear the wrong shirt size because they've never measured themselves properly. Three simple measurements—taken the right way—will solve this forever.
5 min read · IrisThe reason your shirts never fit quite right isn't because your body is difficult—it's because you've been guessing at your size. Most men buy based on what they wore in high school or what fits in the shoulders, then wonder why the collar gapes or the sleeves are too short.
Proper shirt sizing relies on three measurements: neck circumference, sleeve length, and chest width. Once you know these numbers, you can buy with confidence across any brand, whether you're shopping in-person or online. No more returns. No more compromise.
A shirt that fits your neck and sleeve length will fit your chest in almost every case—because brands build their proportions around those two anchors.
What you'll need.
- 01Soft measuring tape (fabric, not metal)
- 02Notepad or phone notes app
- 03A well-fitting reference shirt
- 04Brand size charts (online or in-store)
- 05Another person (optional, for sleeve measurement)
Step one · 2 minutes
Measure Your Neck
Use a soft measuring tape and wrap it around the base of your neck where a collar sits. Keep the tape snug but not tight—you should be able to slip one finger underneath. Write down the measurement in inches (or centimeters). This is your neck size, usually expressed as a whole number: 15, 15.5, 16, 16.5, etc. Most dress shirts and casual button-ups are sized by neck measurement first.
Measure at the end of the day when your neck is at its most relaxed. Morning measurements can be slightly smaller.
Step two · 2 minutes
Measure Your Sleeve Length
Wear a shirt or sweater and have someone measure from the center back of your neck, across your shoulder, down to your wrist bone with your arm relaxed at your side. If you're alone, measure from your wrist bone up your arm to the middle of your shoulder blade, then double it. Sleeve length is typically expressed as a half-inch increment: 32, 32.5, 33, 33.5, etc. A proper sleeve ends at the base of your thumb when your arms hang naturally.
If you're between sizes, go with the shorter length. You can always have a tailor add length; removing it is harder.
Step three · 2 minutes
Measure Your Chest
Measure around the fullest part of your chest, keeping the tape parallel to the ground and snug (but not compressing). This measurement helps you understand your overall proportions and is useful when buying casual shirts, t-shirts, or knitwear that aren't sized by neck. Chest measurements are typically labeled as S, M, L, XL, or as actual inches (38, 40, 42, etc.). Write this down but know that neck and sleeve are your primary sizing anchors.
Chest measurement matters most for fit in the shoulders and torso. If your neck and sleeve are right but the chest feels tight, you may need to size up in that brand.
Step four · 1 minute
Understand the Sizing System
Dress shirts and formal wear use the neck-and-sleeve format (e.g., 16 × 34). Casual button-ups often use S/M/L sizing but should still fit your neck and sleeve. Knits and t-shirts rely on chest-based sizing. Once you know your three numbers, you can navigate any brand's size chart. Always check the specific brand's measurements—a 16 from one maker may fit differently than a 16 from another due to different construction standards.
Bookmark the size charts of brands you like. Screenshot or save them so you can compare before buying.
Step five · 2 minutes
Test Fit on a Known Shirt
Find a shirt that fits you well right now—one that doesn't pull at the buttons, doesn't bunch at the waist, and has sleeves that end at your wrist bone. Measure its neck, sleeve, and chest using the same method. Compare these measurements to your body measurements. The difference tells you whether you prefer a slimmer or roomier cut. Some men measure 16 neck but prefer a 16.5 for comfort; others measure 40 chest but prefer 38 for a tailored look. Your preferences matter as much as your actual measurements.
Keep this reference shirt's measurements in your phone notes. When you're shopping online, you can compare new shirts directly to something you already know works.
Step six · 1 minute
Build Your Size Profile
Create a simple note with your three measurements and your fit preferences. Example: 'Neck: 15.5 | Sleeve: 33 | Chest: 39 | Prefer slim fit in casual wear, regular fit in dress shirts.' Share this with a tailor if you plan to have work done, or keep it handy when shopping. This profile becomes your personal sizing standard and eliminates the guesswork every single time you buy a new shirt.
Revisit your measurements every two years or after significant weight changes. Your size may shift slightly, and knowing that early prevents a closet full of ill-fitting shirts.
How to know it works.
A properly sized shirt should feel comfortable without pulling or bunching. The collar should close without strain, the sleeves should end at your wrist bone, and the torso should skim your body without clinging or ballooning. You should be able to button the shirt fully and move your arms freely. If these conditions are met, the fit is correct.
Questions at the mirror.
What if I'm between two sizes?
Go with the smaller size in neck and sleeve (these are hard to alter), but the larger size in chest width (easier to tailor). Most tailors can take in a shirt's sides without disrupting the overall construction.
Do all brands size the same way?
No. A 16 neck from one brand may feel different from a 16 from another due to fabric, cut, and construction. Always check the brand's specific size chart before ordering online.
Should I account for shrinkage when sizing?
Only if you plan to machine wash and dry. Most quality shirts shrink slightly in the first wash. If you dry clean or air dry, shrinkage is minimal. Check the care tag and size accordingly.
What if my measurements don't match standard sizes?
Many brands offer half-size increments (15.5, 16.5, etc.) and extended ranges. If standard sizes don't work, look for brands that cater to your proportions or consider tailoring as a long-term investment.
How often should I remeasure?
Every two years or after significant life changes (weight gain/loss, muscle gain, etc.). Your size can shift subtly over time, and staying current prevents a closet of ill-fitting shirts.