Fractional inches
These eighth-inch examples retain their exact decimal value. Centimeters are a secondary reference: 1 in = 2.54 cm exactly.
| Fraction | Decimal | Centimeters |
|---|---|---|
| 1/8 in | 0.125 in | 0.3175 cm |
| 1/4 in | 0.25 in | 0.635 cm |
| 3/8 in | 0.375 in | 0.9525 cm |
| 1/2 in | 0.5 in | 1.27 cm |
| 5/8 in | 0.625 in | 1.5875 cm |
| 3/4 in | 0.75 in | 1.905 cm |
| 7/8 in | 0.875 in | 2.2225 cm |
| 1 in | 1 in | 2.54 cm |
Linear yardage
One international yard is 36 in, or 91.44 cm exactly. This table converts length along a piece or bolt. It does not supply fabric width, square-cut capacity or a purchase allowance.
| Yardage | Inches | Centimeters |
|---|---|---|
| 1/8 yd | 4.5 in | 11.43 cm |
| 1/4 yd | 9 in | 22.86 cm |
| 3/8 yd | 13.5 in | 34.29 cm |
| 1/2 yd | 18 in | 45.72 cm |
| 5/8 yd | 22.5 in | 57.15 cm |
| 3/4 yd | 27 in | 68.58 cm |
| 7/8 yd | 31.5 in | 80.01 cm |
| 1 yd | 36 in | 91.44 cm |
A fat quarter and a conventional quarter-yard cut can have similar nominal area but different shapes. Use measured usable dimensions when planning cuts; a linear conversion alone does not establish fit.
Enter decimal inches
For a mixed number, add the whole number to the decimal fraction: 3 3/8 in becomes 3.375 in. The site’s eighth-inch number fields accept 3.375; they do not parse slash-form text such as 3 3/8.
The eighth-inch input step is a field rule, not permission to round a more precise cut. Named methods can produce other fractions, and measured shrinkage uses its separately labeled precision. Follow the cut plan and the units shown beside each field.