Clothing & Accessories Calculators
Rings, hats, bras, dresses, jeans: the sizes that change by country and sometimes by brand within the same store. Start with What Size Am I to get every size from one set of measurements, then use the individual tools for the conversions, the fit troubleshooting and the caveats.
- Belt Size CalculatorPant size plus 2, explained: your US and EU belt size three different ways.
- Body vs Garment MeasurementsWhy a 36 inch chest needs a 40 inch shirt. Turn garment specs into fit.
- Bra Size CalculatorMeasure once: your size, both sister sizes, and every international equivalent.
- Diaper Size ChartSized by weight, not age. Two sizes usually fit, and leaks decide.
- Dress Shirt Size CalculatorNeck and sleeve measurements in, exact shirt size out: numeric, letter, and EU.
- Dress Size CalculatorBust, waist, and hip to US, UK, EU, and IT dress sizes, with fit guidance.
- Glove Size CalculatorHand circumference in, numeric and letter glove size out. It is just inches.
- Hat Size CalculatorTurn head circumference into US, UK, EU, and letter hat sizes.
- Jacket Size ConversionMen's jacket and suit sizes across US, UK, EU, IT, and over to women's.
- Jeans Size ConversionMen's to women's jeans sizes and back, plus US, UK and EU, anchored to waist inches.
- Letter Size ConversionWaist or chest in, S/M/L/XL out, with the men's to women's crossover.
- Pant Size ConversionConvert pant and jean sizes across US, UK, EU and waist inches.
- Ring Size CalculatorString, paper, or an existing ring: get your US size plus UK, EU, and JP conversions.
- Swimsuit Size ConversionUS, UK, AU and EU swim sizes, plus the torso check for one-pieces.
- Watch Band Size CalculatorWrist size in, case diameter range and strap lengths out.
- What Size Am I CalculatorMeasure once, get every size. Dress, jeans, jacket, letter and shoes.
The label is a manufacturing decision, not a fact about you
Clothing sizes are the least standardised numbers in this whole site. A shoe at least converts on a fixed offset. A dress size does not, because there is no authority setting it: each brand picks its own measurements and prints whatever number it thinks will sell. Vanity sizing has moved women's labels roughly four sizes since the 1950s, so a garment marked 8 today would have been a 16 then, on the same body.
That is why every tool here asks for a measurement rather than an existing size. Give it inches and it can tell you something true. Give it a label from another brand and you are compounding two guesses.
Fourteen tools live in this category, and they split into three jobs: converting a size you already know across countries, turning a tape measure reading into a size, and working out whether a garment's own listed measurements will actually fit around you.
Letter sizes by waist and chest
S, M, L and XL feel like they should be simple, and they are the messiest of the lot, because the same letter means different things for tops and bottoms and for men and women. These are the bands our letter size converter uses, in inches.
| Letter | Men's waist | Men's chest | Women's waist | Women's bust |
|---|---|---|---|---|
| XS | 26 to 27 | 32 to 34 | 24 to 26 | 32 to 33 |
| S | 28 to 30 | 35 to 38 | 26 to 28 | 34 to 35 |
| M | 32 to 34 | 39 to 40 | 28 to 30 | 36 to 37.5 |
| L | 36 to 38 | 41 to 42 | 31 to 34 | 39 to 40.5 |
| XL | 40 to 42 | 43 to 44 | 35 to 38 | 42 to 44 |
| XXL | 44 to 46 | 45 to 48 | 40 to 43 | 46 to 48 |
| 3XL | 48 to 50 | 49 to 52 |
Read across a single row and you can see the trap. A 42 inch measurement is a men's XL if it is your waist and a men's L if it is your chest. A 40 is an XL as a waist and an M as a chest. Nobody says which measurement they mean, which is exactly why these questions keep coming back without a settled answer.
Notice also that the bands have gaps. Men's L stops at 38 and XL starts at 40, so a 39 inch waist sits between two published sizes. That gap is real and in the charts, not an oversight here, and the honest answer is that you are between sizes and should decide on fabric stretch rather than be handed a number that does not fit.
Body measurements are not garment measurements
This is the single most useful idea in the category, and the one most people have never been told. A shirt listed as a 40 inch chest is not built for a 40 inch chest. It is built for a smaller body, with room added so you can move and breathe. That added room is called ease.
A fitted top carries about 2 to 4 inches of ease. A classic cut carries 4 to 6. A relaxed cut carries 6 to 9, and a jacket needs more again because it has to close over what is underneath. A waistband carries almost none.
So a 36 inch chest often needs a garment listed at 40. If you buy garment measurements as though they were body measurements, everything you own will be too small, and if you do the reverse everything will be tents. The body vs garment tool does this arithmetic in both directions, including doubling a flat measurement when a listing gives you pit to pit rather than a full circumference.
How to measure yourself, once, properly
Almost every tool in this category runs on three numbers, so it is worth taking them carefully one time.
Bust or chest goes around the fullest part, tape level all the way round, arms down. Waist goes around where your waistband actually sits, which for most people is not the narrowest point of the torso and is not where trousers sat twenty years ago. Hips go around the widest part, usually a few inches below the waist.
Keep the tape snug but not tight, breathe out normally, and measure twice. Half an inch of tape drift changes the answer often enough to matter. If you have no tape, a piece of string and any ruler will do the job, and a credit card is 85.6 mm on its long edge under ISO/IEC 7810 if you need to check a short distance.
Where the conversions actually break
Converting between countries is arithmetic and our tools handle it. UK women's runs 4 above US, EU runs 32 above, Italy 38 above. Men's jackets are simpler still, since US and UK both use the chest measurement in inches and EU and Italy add 10.
The men's to women's crossover is where honest answers get harder, and we give a range rather than a single number on purpose. Men's and women's garments are cut to different shapes, not just different sizes, so a jacket that matches on the chest can be wrong through the shoulder and the waist at the same time. A number that hides that is not more accurate, it is just more confident.
Swimwear deserves its own warning. Competition suits run two to three sizes small by design, and a one piece has to fit your torso length as well as your circumference, which is the measurement almost nobody publishes. If a one piece pulls down on your shoulders, sizing the whole suit up is the wrong fix.
Frequently asked questions
Is a 32 inch measurement a size M or a size L?
It depends which measurement you mean, and that is the whole reason this question keeps recurring. A 32 inch waist is a men's M. A 32 inch chest is a men's XS. Nobody states which one they are quoting, so check the tool's waist and chest bands rather than assuming a single letter covers both.
Why is my size different in every shop?
Because no authority sets clothing sizes. Each brand chooses its own measurements and prints its own number, and vanity sizing has shifted women's labels about four sizes since the 1950s. Measure yourself in inches and convert from that, rather than carrying a label from one brand to another.
Why does a 36 inch chest need a 40 inch shirt?
Because garment measurements include ease, the room added so you can move. A fitted top carries about 2 to 4 inches of ease, a classic cut 4 to 6, a relaxed cut 6 to 9, and a jacket more again. The listed number describes the garment, not the body it is meant for.
What if my waist falls between two published sizes?
That gap is real and it is in the published charts, not an error. Men's L stops at a 38 inch waist and XL starts at 40, so a 39 sits between them. Decide on fabric: something with stretch will take the smaller size, something rigid will not.
How do I convert US women's sizes to UK and EU?
UK runs 4 above US, EU runs 32 above, and Italy runs 38 above. A US 10 is a UK 14, an EU 42 and an IT 48. The conversion itself is reliable; what varies is how a given brand cuts the garment inside that label.
Why is the men's to women's conversion given as a range?
Because men's and women's garments are cut to different shapes, not just different sizes. A jacket matched on the chest can still be wrong through the shoulder and the waist. A single number would look more precise while being less true, so the tool reports the range it can actually stand behind.
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