To change inches into centimeters, multiply by 2.54; to change centimeters into inches, divide by 2.54. The National Institute of Standards and Technology defines the inch as exactly 2.54 cm. Use the tables below for quick lookups, then take the converted number to the size chart for the bracelet you are considering. S, M and L need that product’s own numerical definitions.
Key facts
- The inch is defined as exactly 25.4 millimeters, or 2.54 centimeters (NIST).
- 7¾ inches is 7.75 inches, which converts to 19.685 cm, shown as 19.69 cm after rounding.
- 8½ inches equals 21.59 cm exactly, 0.09 cm (0.9 mm) more than a paired 21.5 cm label.
- 7⅛ inches means 7.125 inches, or 18.0975 cm (18.10 cm rounded to two decimal places).
Whenever you switch between inch and centimeter listings, keep the original measurement next to the conversion. Only the unit changes. A wrist reading stays a wrist reading, and a bracelet length stays a bracelet length.
Inches to centimeters: quarter-inch lookup
Centimeter results are rounded to the nearest 0.01 cm. The range is simply a convenient span for lookups; it doesn’t describe typical wrists or the sizes you’ll find for sale.
| Inches, fraction | Inches, decimal | Centimeters, rounded |
|---|---|---|
| 5½ | 5.50 | 13.97 |
| 5¾ | 5.75 | 14.61 |
| 6 | 6.00 | 15.24 |
| 6¼ | 6.25 | 15.88 |
| 6½ | 6.50 | 16.51 |
| 6¾ | 6.75 | 17.15 |
| 7 | 7.00 | 17.78 |
| 7¼ | 7.25 | 18.42 |
| 7½ | 7.50 | 19.05 |
| 7¾ | 7.75 | 19.69 |
| 8 | 8.00 | 20.32 |
| 8¼ | 8.25 | 20.96 |
| 8½ | 8.50 | 21.59 |
| 8¾ | 8.75 | 22.23 |
| 9 | 9.00 | 22.86 |
| 9¼ | 9.25 | 23.50 |
| 9½ | 9.50 | 24.13 |
| 9¾ | 9.75 | 24.77 |
| 10 | 10.00 | 25.40 |
Read 7¾ inches as 7.75 inches. Its exact conversion is 19.685 cm, shown as 19.69 cm after rounding. That same row works for a wrist circumference or an end-to-end product length, as long as you note which one it is. It does not tell you that a 7¾-inch bracelet fits a wrist of that size.
Centimeters to inches: reverse lookup
Start here when the number you have is in centimeters. Inch results are rounded to the nearest 0.01 inch. If your measurement falls between rows, divide your exact number by 2.54 instead of rounding to a nearby row.
| Centimeters | Inches, rounded |
|---|---|
| 14 | 5.51 |
| 15 | 5.91 |
| 16 | 6.30 |
| 17 | 6.69 |
| 18 | 7.09 |
| 19 | 7.48 |
| 20 | 7.87 |
| 21 | 8.27 |
| 22 | 8.66 |
| 23 | 9.06 |
| 24 | 9.45 |
| 25 | 9.84 |
| 26 | 10.24 |
For closer centimeter steps and more background on size systems, use the half-centimeter conversion chart. The inch-first table on this page is handier when a tape or listing gives quarter-inch values.
Inches versus centimeters when shopping in North America
Go by the unit printed next to the size, not by where the seller is based. A US or Canadian shopper may see an inch label, a centimeter chart or both. “Size 8” with no unit or definition can’t be converted.
Check the chart heading before matching numbers. A range headed “fits wrist” describes the intended body measurement. “Bracelet length” describes the product, and you need the design’s fitting instructions to relate it to your wrist. Converting units doesn’t add any wearing room.
Paired labels can also be approximate. For example, 8½ inches equals 21.59 cm exactly. A listing that calls both 8½ inches and 21.5 cm the same size is using values that differ by 0.09 cm, or 0.9 mm. If you’re right on a size boundary, ask the seller which chart and measurement apply to that bracelet.
Watch fractions too. 7⅛ inches means 7.125 inches; it does not mean 7.8 inches. Its conversion is 18.0975 cm, or 18.10 cm rounded to two decimal places. When using a basic calculator, enter the whole number plus the fraction: 7 + (1 ÷ 8), then multiply by 2.54.
Keep your original reading when contacting a seller. A useful question is: “My wrist circumference is 7⅛ inches. Does your chart ask for my wrist measurement or the bracelet’s finished length?” Include the product reference so the answer applies to the design you want. If you need to take a fresh reading, follow the wrist-measuring guide before choosing a size.
Find S, M or L from the product’s chart
Pick the letter last. Copy the number range next to it from that bracelet’s own size guide; a Medium from another bracelet doesn’t carry over. A letter tells you nothing until you know which measurement it stands for.
- Find the chart for the exact design and check whether it asks for your wrist circumference or gives the bracelet’s dimensions.
- Keep your original number and unit. Convert it once if the chart uses a different unit.
- Find the range your number falls in and read what the chart says about its endpoints. Don’t assume a number on a shared boundary belongs to the larger or the smaller size.
- Choose the letter for that range, along with any fit option the chart offers.
If the page gives only S/M/L, ask for the measurements instead of guessing them. The same goes for XS, XL and “one size.” For a gift, an old size label is a useful clue, but the recipient’s actual measurement is what you can compare against the chart.
Keep the dimension and the rounding with the number
A bangle’s inside diameter measures across its opening. Its inside circumference measures around that opening. A cuff may also list an entry gap and two inside spans. Convert each named dimension separately; a unit conversion cannot turn a diameter into a circumference or an open chain length into a rigid bracelet’s interior.
Rounded results are convenient for reading, but avoid rounding them again to a whole inch or centimeter before selecting a size. More decimal places in a conversion also do not make the original tape reading more precise. Keep a note with four details: the original number, its unit, what it measures and the product chart used.
Once those match, move on to fit. How much room you want, getting it over your hand and how freely it moves all depend on the bracelet’s construction and sizing instructions. The bracelet tools and worksheets have other decision aids.
Use the sizing worksheet and worked examples for that next step: direct wrist-range lookup, a design-specified allowance or a fastening-point measurement.
Sources
- National Institute of Standards and Technology (NIST): SI Units – Length