How to Find Your Shirt Size: Calculator, Charts & Complete Fit Guide

Ever ordered a shirt online, waited days for delivery, and ended up with something that fits like a tent — or won't pull past your shoulders? It's one of the most frustrating experiences in online clothing shopping. With over 2 billion people buying apparel online every year, accurate shirt sizing has never mattered more.

This guide gives you everything in one place — a shirt size calculator, men's and women's size charts, a full international shirt size conversion chart, Gildan t-shirt sizing, dress shirt sizing explained, and a practical fit guide for every body type. Whether you're shopping for yourself or ordering custom promotional T-shirts for your team, you'll leave knowing exactly what size to order.

What Measurements Do You Need?

Before diving into any shirt size chart, grab a soft measuring tape. Body measurements are the backbone of accurate shirt sizing — and skipping this step is the number one reason people end up with the wrong size.

Here's what to measure:

How to Measure Your Chest

Wrap the tape around the fullest part of your chest, just under your armpits. Keep it level and snug — not tight. This chest measurement is your single most important number. A medium shirt typically requires a chest width between 19" and 20" for men, and around 19" for women.

How to Measure Your Shoulder Width

Measure straight across your upper back, from the edge of one shoulder to the other. Wide shoulders often push you toward a larger size even when your chest measurement suggests otherwise. A shoulder width of 22 inches in men typically corresponds to a 5XL, while 17" usually fits a medium.

How to Measure Your Shirt Length

Start at the highest point of your shoulder near the neck and measure straight down to where you want the shirt to end. Ideally, your shirt length should fall just below your hips — around mid-fly on your pants.

How to Measure Your Sleeve Length

For dress shirts and button-downs, start at the centre back of your neck, run the tape across your shoulder, and continue down to your wrist. This gives you a full sleeve length measurement. For reference, the average sleeve length for a 5'8" male falls around 32"–33".

How to Measure Your Waist

Measure around your natural waistline — the narrowest part of your torso. This measurement matters most for women's shirts, which use waist-shaping stitching to create a more flattering cinched silhouette.

How to Measure Your Armhole

For a proper torso fit, measure the circumference of your armhole — from the top of your shoulder seam around and back. A size medium men's shirt typically has an armhole of around 9.25".

Shirt Size Calculator: Find Your Size by Height and Weight

No measuring tape handy? A height and weight calculator gives you a reliable starting point. Here's a general clothing size calculator based on height and weight for adults:

If you're 5'10" and slim, a size small might fit your chest but leave the shirt too short. If you're 5'6" with a broader build, a medium might be tight in the shoulders but perfect in length. That's exactly why cross-comparing matters.

Adult Shirt Size Charts (U.S.)

These are the standard U.S. shirt size charts for adult apparel. All measurements are in inches.

Men's Shirt Size Chart

Men's shirts feature a straight cut — no waist shaping — with wide shoulders, loose sleeves longer than women's styles, and buttons on the right side. There's generally less room in the chest area than in a woman's shirt of the same labelled size.

A common question: what size shirt should a 5'7" man wear? At average weight (155–170 lbs), a medium is usually the right call. At 5'6" and leaner, a small often works better.

Women's Shirt Size Chart

A woman's small shirt size typically measures 18" chest width and 25" in length. Women's shirts feature narrow shoulders, fitted sleeves, and cinched-waist stitching — all designed for a more flattering torso fit. Buttons sit on the left side.

Unisex T-Shirt Size Chart

Unisex apparel sizing generally follows men's cuts. Women shopping unisex should size down one — so a women's medium typically fits best in a unisex small.

International Shirt Size Conversion Chart

Shopping from a global brand? This shirt size conversion chart keeps you from ordering the wrong size.

U.S. to UK Shirt Sizes

UK sizing runs close to U.S. sizing but isn't a perfect match. A U.S. medium in women's typically corresponds to a UK 8–10. Men's sizing aligns more closely — though always confirm with the brand's own size chart.

U.S. to France, Italy, Japan & Australia

French and Italian sizing uses numerical values that can look confusing at first glance. Japanese sizing generally runs smaller than U.S. equivalents — if you're a U.S. medium, you may need a Japanese large. Australian sizing mirrors UK sizing closely. When ordering internationally, your bust measurement is your most reliable anchor point.

Gildan T-Shirt Size Chart

Gildan is one of the most trusted names in custom-logo, branded, and promotional t-shirts. Their 100% cotton T-shirts are a staple for businesses, nonprofits, sports teams, and events. Here's the Gildan shirt sizing for their Adult Cotton Tee:

Gildan shirts run true to size for most body types. If you're between sizes, size up — 100% cotton shrinks slightly after the first wash. For personalised shirts or bulk custom apparel orders, Gildan's consistent sizing makes it one of the easiest brands to order across multiple sizes.

Dress Shirt Sizing: How It Works

Dress shirt sizing works differently from casual t-shirt sizing. Instead of S/M/L labels, dress shirts use two numbers — for example, 15 32/33 or 17 34/35.

• The first number is your collar size in inches
• The second number is your sleeve length (or a range like 34/35)

So a shirt labelled 16 34/35 fits a 16" collar with a 34"–35" sleeve length. To find your dress shirt size, measure your neck circumference and your sleeve length separately. A size 15.5 collar is roughly a medium in standard sizing.

What does 34/35 mean on a dress shirt? It means the shirt is cut to fit both a 34" and 35" sleeve — a half-size range that accommodates slight variations without needing to stock every exact length.

Men's vs. Women's Shirt Sizing: Key Differences

Understanding men's vs women's shirt sizing helps prevent a lot of confusion — especially when shopping unisex or converting between the two.

Men's shirts:

• Straight cut with no waist shaping
• Wide shoulders and loose sleeves
• Longer sleeve length than women's equivalents
• Less room in the chest area
• Buttons on the right side

Women's shirts:

• Cinched waist shirt stitching for shape
• Narrow shoulders and fitted sleeves
• More space in the chest area
• Shorter sleeve length
• Buttons on the left side

Many retailers now offer unisex t-shirts as part of a push toward inclusive fashion — one cut designed to fit comfortably across genders. For bulk orders of promotional T-shirts or custom apparel, unisex sizing simplifies the process considerably.

How a T-Shirt Should Fit

Knowing your size is step one. Understanding proper shirt fit is what takes your look from “fine” to actually good.

Chest and Shoulder Fit

Shoulder seams should sit right at the edge of your shoulders — not drooping down your arm, not pulling toward your neck. A breathable shirt with the right chest width lets you move your arms freely. If the seams hang past your shoulder, the shirt is too big; if they pull toward your neck, size up.

Shirt Length — Falls Below Your Hips

Your shirt length should land around mid-fly on your pants. Too short and it rides up every time you reach for something — nobody wants to flash their stomach in the office. Too long and it bunches awkwardly at the waist. A reliable test: raise both arms above your head. If the shirt exposes your belly, it's too short. A proper t-shirt length also lets you tuck the shirt in neatly if the occasion calls for it.

Sleeve Fit and Arm Mobility

Sleeves should give you full arm mobility without flapping. Fitted sleeves that grip too tightly restrict movement. Loose sleeves that billow look sloppy. The right sleeve hits just below your shoulder and drapes cleanly down your arm.

Torso Fit — Not Too Tight, Not Too Loose

A comfortable t-shirt fit skims your torso without clinging. You shouldn't see pulling across your chest or a tight t-shirt fit that outlines your midsection. On the flip side, a loose T-shirt fit that adds bulk isn't flattering. Think “relaxed” rather than “baggy.”

Fit for Tall and Short People

Tall shirt sizing is a real challenge. If you're 6'3" or taller, standard shirts often fit fine in the chest but fall short in length — sizing up one solves the length issue, even if the chest is slightly looser. Short-person shirt sizing works in reverse — youth sizes sometimes offer the right torso length without drowning in fabric. If you're petite, youth sizes are worth exploring.

Shirt Fit by Body Type

Straight Cut vs Cinched Waist

A straight-cut shirt suits athletic or rectangular body shapes well. If you want to define your waist, look for a cinched waist shirt with side seaming. Women's shirts naturally offer this; standard men's shirts typically don't.

Boxy Fit vs Fitted Sleeves

A boxy t-shirt fit hides your shape — great for a relaxed, oversized aesthetic but not always the most flattering option. Fitted sleeves paired with a tapered body create a cleaner silhouette without looking tight.

Finding a Flattering T-Shirt Fit

The most flattering t-shirt fit follows your body without drawing attention to every contour. Your chest measurement and shoulder width are the two anchors — get those right and the rest follows naturally. For plus-size t-shirts, look for brands that offer consistent sizing from XS through 5XL rather than scaling up a standard cut.

Common Shirt Sizing Mistakes (And How to Avoid Them)

• Relying on brand size labels alone. Sizing varies significantly between brands. Always check the specific shirt size chart before ordering.
• Ignoring shoulder width. Drooping shoulder seams are the clearest sign a shirt is too large — even if the chest feels fine.
• Skipping the shirt length check. Length is the most overlooked measurement in shirt sizing.
• Not accounting for cotton shrinkage. 100% cotton T-shirts shrink. If you're borderline between sizes, size up.
• Assuming unisex means a neutral fit. Unisex sizing follows men's cuts. Women typically need to size down one for a proper fit.
• Ignoring sleeve length for dress shirts. A dress shirt with the wrong sleeve length looks off no matter how well the collar fits.

How to Know If Your Shirt Is Too Small

Sometimes the fit issue isn't immediately obvious. Here's how to tell if a shirt is too small:

• Shoulder seams pull toward your neck
• The chest area feels tight when you breathe deeply
• The shirt rides up past your waistband when you lift your arms
• Sleeve seams dig into your arms
• The collar feels like it's choking your neck

And here's how to tell if it's too large:

• Shoulder seams hang past the edge of your shoulders
• Excess fabric bunches at the waist and hips
• Sleeves cover your hands
• The shirt looks boxy and shapeless on your torso

Custom T-Shirts: Getting the Size Right for Branded Apparel

Why Accurate Sizing Matters for Promotional T-Shirts

When you order branded t-shirts for a team, event, or giveaway, sizing accuracy is everything. A shirt that doesn't fit won't get worn. A shirt that goes unworn doesn't promote your brand. RELYmedia helps clients navigate sizing across their entire team — ensuring every person gets a shirt that fits well, from XS to 5XL.

Unisex and Inclusive Apparel Sizing for Teams and Organisations

For bulk orders, unisex T-shirts simplify sizing across a diverse team: one style, one chart, multiple fits. RELYmedia's custom apparel guide helps organisations choose the right cut — whether that's a standard unisex tee, a women's fitted style, or plus-size t-shirts — so everyone feels comfortable and represented. That's inclusive fashion done right.

Conclusion

Getting your shirt size right isn't complicated — but it does take a few minutes of measurement and a willingness to cross-reference charts rather than guessing. Measure your chest, check your shoulder width, confirm your shirt length, and use the size charts above to land on the right size every time. Whether it's a casual tee, a dress shirt, or a bulk order of branded apparel, accurate sizing is the difference between a shirt you love and one that sits at the back of your closet.

Frequently Asked Questions