A tailor's precision, at global scale. Free size calculators for t-shirts, bras, shoes and more — every country, every body, no sign-up.
Jump to: How to measureSize cheat sheetFit decoderSizing mistakesFabric guide
Clothing, undergarments, footwear and more — for men, women and kids, mapped across US, UK, EU and India.
Chest & shoulder based, unisex chart
Band + cup, from two measurements
Foot length → US / UK / EU / India
Waist based, unisex chart
By age or height, boys & girls
From finger diameter
From head circumference
From your pant waist size
From hand circumference
Chest based, roomier fit
From wrist circumference
Not sure of your measurement, or already know a size in one country? These are built for that.
Reference tables for men, women, kids and shoes — no typing needed
🌐Already know your size? Convert it straight across US / UK / EU / India
📖How to measure yourself, and why sizes vary so much
🧵Fabric calculator and cutting tools, for tailors and custom stitching
Almost every sizing mistake starts with a rushed measurement. Use a soft tailor's tape, stand relaxed in light clothing, and take each number twice.
Wrap the tape around the fullest part of your chest, under the armpits and across the shoulder blades. Keep it level and breathe out normally.
Decides: t-shirts, shirts, sleepwear 02Measure where your trousers actually sit, not your natural waist. Slide one finger under the tape so it's snug, not tight.
Decides: pants, jeans, belts 03Measure across your back from the bony tip of one shoulder to the other. Easiest with a helper, or by measuring a shirt that fits you well.
Decides: shirt and jacket fit 04From the crotch seam straight down the inside of the leg to where you want the hem. Measuring your best-fitting jeans is the most reliable way.
Decides: trouser lengthTape tip: measure in the evening for shoes (feet swell through the day) and in the morning for rings (fingers are slimmer when cool).
The same shirt can carry a letter, a US/UK chest number, an Indian number and an EU number. Here's how they line up on our standard unisex chart.
| Letter | Your chest (in) | Your chest (cm) | US / UK | India | EU |
|---|---|---|---|---|---|
| XS | 32–34 | 81–86 | 34–36 | 36 | 44 |
| S | 34–36 | 86–91 | 36–38 | 38 | 46 |
| M | 38–40 | 97–102 | 38–40 | 40 | 48 |
| L | 42–44 | 107–112 | 40–42 | 42 | 50 |
| XL | 46–48 | 117–122 | 42–44 | 44 | 52 |
| XXL | 50–52 | 127–132 | 44–46 | 46 | 54 |
Falling between two rows? Take the larger size for a relaxed fit or if you have broad shoulders, the smaller one for a close, fitted look. Full tables for men, women, kids and shoes are on the size charts page.
Every garment is cut bigger than your body. That extra room is called ease, and it's what separates one fit from another — not the size letter.
Little extra room through the chest and waist. Follows your shape; size up if you're between sizes.
The everyday cut most size charts assume. Comfortable to move in without looking loose.
Noticeably roomier body and sleeves. Usually stay in your true size.
Built-in width and a dropped shoulder. Buy your true size — sizing up a regular tee only makes it longer.
Want the details on this season's shapes? Read how to size 2026's biggest t-shirt trends.
A Medium is whatever each brand decides it is. Compare your measurement to that brand's chart, every time.
Bulky layers can add 2–5 cm. Measure over a thin t-shirt or bare skin.
A tape that dents the skin under-measures. Snug, flat and level is the goal.
Body charts list your measurement; garment charts list the clothing's. Garment numbers are always bigger.
Untreated 100% cotton can shrink after a hot wash. Look for "pre-shrunk", or allow a little extra length.
US, UK and EU shoe scales don't step evenly, and men's and women's US sizes differ. Go back to foot length in cm.
Two shirts with identical measurements can fit differently because of what they're made of. Use this as a quick guide when the chart puts you between sizes.
| Fabric | Stretch | Shrinks after washing? | Between sizes? |
|---|---|---|---|
| 100% cotton (untreated) | Low | Yes, especially in hot water or a dryer | Size up |
| Pre-shrunk cotton | Low | Very little | True size |
| Cotton–polyester blend | Low–medium | Minimal | True size |
| Cotton with elastane / spandex | High | Minimal | Smaller size for a close fit |
| Polyester / performance knit | Medium | Almost none | True size |
| Linen | None | Some, on first washes | Size up — linen doesn't give |
US, UK, EU, India & more, cross-converted instantly
No sign-up. No paywall. Just your size.
Easy on the eyes, day or night
Add to your home screen, use it like an app
Yes. Every calculator here is completely free, with no sign-up and no usage limits.
No. Every calculation runs locally in your browser. Your measurements are never sent to or stored on our servers.
Each brand uses its own block pattern and fit philosophy, so a Medium in one brand can fit differently from a Medium in another, even at the exact same chest measurement. Always check a specific brand's chart when it's available.
It uses a standard band-and-cup measurement method — a reliable starting point, but fit still varies by brand and style, so trying before buying is always recommended.
Yes — every calculator has its own shareable link, for example 7tshirts.com/#bra opens straight to the Bra Size Calculator.
Yes — the site is fully responsive, and most browsers (like Chrome) will offer their own "Install" or "Add to Home Screen" option — usually as an icon in the address bar or your browser menu.
It's based on standard foot-length-to-shoe-size charts used across US, UK, EU and India. Brands like Nike or Adidas can run half a size differently, so treat it as a strong starting point.
A Calculator takes your own body measurement and gives you a size. A Size Chart is a static reference table you read directly. The Converter is for when you already know your size in one country and want it in another — no measuring needed.
No. Every tool on 7TShirts works immediately, with no account, login, or email required.
Yes — every calculator result has Copy, Print, and Share buttons, so you can save your size, print a clean copy, or send it to a friend instantly.
Yes — use the circular toggle in the top-right corner of the header. Your choice is remembered on your next visit, on this device.
Once you've visited the site, core pages are cached for faster loading and basic offline access, thanks to a built-in service worker.
They give a solid planning estimate — fabric needed, pieces cuttable, thread required — but always leave a margin and confirm with your tailor before making final fabric or thread purchases.
Roughly 2 to 12 years, using both height and age as inputs. Height is generally more reliable, since children of the same age can vary a lot in size.
Diameter is easier to measure accurately from an existing ring, and it's the number most international ring size charts are built around. We explain how to measure it either from your finger or an existing ring right on the calculator.
Please contact us with the calculator name and the inputs you used, and we'll look into it as quickly as possible.
Measure around the fullest part of your chest, keeping the tape flat and level.
Measure straight across your back, shoulder point to shoulder point.
| Size | US/UK | India | EU | Chest (in) |
|---|
Measure directly under your bust, tape snug and level.
Measure around the fullest part of your bust, tape level, wearing a non-padded bra.
Stand on paper, mark heel to longest toe, measure the line in cm.
| US | UK | EU | India | CM |
|---|
Measure around your natural waistline, where you'd normally wear the waistband.
Measure from the crotch seam to the bottom of the ankle.
| Waist (in) | Letter | India | EU |
|---|
Most accurate — measure standing height without shoes.
Wrap a strip of paper snugly around your finger, mark where it overlaps, then measure the length and divide by 3.14 (π) to get diameter — or measure a ring you already own that fits well.
Wrap tape around your head about 1cm above your eyebrows, over the widest part.
Use the waist size on your pants' label, or measure where you'd wear the belt.
| Pant Waist | Belt Size |
|---|
Wrap tape around your palm at its widest point, not including the thumb.
| Letter | Continental | Hand (in) |
|---|
Measure around the fullest part of your chest, tape flat and level.
| Size | US/UK | India | EU | Chest (in) |
|---|
Wrap tape around your wrist, just below the wrist bone, where you'd wear a watch.