Reading a US Size Chart When Your Tape Measure Is Metric
You have wrapped a tape measure around your chest and it reads 96. The size chart on the American brand's website talks about 38 and 40. Those are inches, and the gap between the two numbering systems is the most common reason online clothing orders come back in the wrong size.
This page handles that one job: turning the centimetre figures you take off your own body — or off a sewing pattern printed for the European market — into the inch figures that garment charts, jean labels and dress-shirt collars are written in.
Where the Two Systems Meet
Ordering From US Brands
Sewing Patterns
Fabric and Trim
From Tape Measure to Chart Column in Three Steps
Take the measurement snugly
Chest and bust at the fullest point, waist at the natural crease, inseam from crotch seam to ankle bone. Keep the tape level and do not pull it tight — a centimetre of slack becomes almost half an inch of error.
Type the centimetre figure in
Enter it in the upper field. Decimals are welcome and a comma works as well as a dot, so 96,5 and 96.5 both give the same answer.
Match it to the nearest chart row
Size charts jump in whole or half inches, so round to the nearest listed value. If you land between two rows, the looser one is usually the safer buy for outerwear and the tighter one for knitwear.
Working the other way is just as common: a pattern that calls for a 38 in finished bust needs to become centimetres before you can compare it with your own tape. Press the swap arrows between the two fields and the page converts inches back into centimetres without you retyping anything.
What Each Body Measurement Becomes on a US Label
Garment labels round aggressively, and different measurements round in different directions. The table below shows the raw arithmetic next to the label you will actually see on the tag.
| Measurement | Centimetres | Inches | Typical US label |
|---|---|---|---|
| Chest (men's) | 96 cm | 37.8 in | 38 — Medium |
| Bust (women's) | 91 cm | 35.8 in | 36 — US 8 |
| Natural waist | 81 cm | 31.9 in | 32 waist |
| Inseam | 81 cm | 31.9 in | 32 in leg |
| Shirt collar | 40 cm | 15.7 in | 15½ neck |
| Fabric bolt width | 114 cm | 44.9 in | 45 in bolt |
Type the Tape-Measure Number Straight In
The inch figure appears while you are still typing, so you can run through chest, waist and inseam in one sitting without touching a button.
Flip It to Read a Pattern in Inches
The arrows between the fields reverse the direction, which is what you want when the pattern envelope quotes finished sizes and your tape does not.
Paste a Clean Number Into an Order Form
Each field copies the bare figure with no unit attached, which is exactly what a made-to-measure order form or a tailor's spreadsheet expects.
Drop Down to Millimetres for Trim
Buttons, zip teeth and elastic widths are quoted in millimetres. Search either unit list and the same two fields handle those as well.
Sizing and Sewing Questions
My chest measures 96 cm — which US shirt size is that?
96 cm is 37.8 in, which nearly every US chart calls a 38 and sells as a Medium. If you are between 96 and 101 cm (37.8–39.8 in) you are in the Medium band; above roughly 102 cm you move into Large.
Should I compare my body measurement or the garment's?
Check which the chart is quoting before converting. A "body measurement" chart expects your own tape reading. A "garment measurement" chart lists the flat-laid piece, which already includes ease, so a 38 in shirt for a 38 in chest would be uncomfortably tight.
Why don't my 32 waist jeans measure 32 inches?
Denim waist labels drifted years ago. Many pairs marked 32 actually measure 33–34 in (84–86 cm) at the waistband, a practice known as vanity sizing. Measure a pair that already fits you, flat across the waistband, double it, convert, and shop by that number instead of the label.
How much seam allowance does an inch-based pattern assume?
US commercial patterns almost always use 5/8 in, which is 1.5875 cm. European and independent patterns usually use a round 1.5 cm. The difference is invisible on one seam but adds up across a fitted bodice with eight of them.
Do UK and US dress sizes sit on the same inch figures?
No. UK numbering runs roughly four sizes higher for the same body: a 91 cm (35.8 in) bust is generally a US 8 and a UK 12. Converting to inches tells you the measurement; you still have to read the chart for the country you are buying from.
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