Millimeters per stitch to stitches per inch
Type a value in mm to get it in SPI instantly.
11.98SPI
That's 1.41× as long as fine fabric, while a standard seam is 1.18× longer.
Convert the other way: SPI to mm
What it means
How long is that stitch?
For straight stitch. Thread tension and fabric thickness change the stitch you actually get by a little.
The math
How to convert mm to SPI
mm per stitch = 25.4 ÷ SPI; SPI = 25.4 ÷ mm.
Example: 2.12 mm = 11.9811 SPI.
Every unit
That stitch in every unit
Tables
mm to SPI conversion table
| mm | SPI |
|---|---|
| 1.27 mm | 20 SPI |
| 1.41 mm | 18.0142 SPI |
| 1.59 mm | 15.9748 SPI |
| 1.81 mm | 14.0331 SPI |
| 2.12 mm | 11.9811 SPI |
| 2.31 mm | 10.9957 SPI |
| 2.54 mm | 10 SPI |
| 2.82 mm | 9.00709 SPI |
| 3.18 mm | 7.98742 SPI |
| 3.63 mm | 6.99725 SPI |
| 4.23 mm | 6.00473 SPI |
| 5.08 mm | 5 SPI |
SPI to mm conversion table
| SPI | mm |
|---|---|
| 5 SPI | 5.08 mm |
| 6 SPI | 4.23333 mm |
| 7 SPI | 3.62857 mm |
| 8 SPI | 3.175 mm |
| 9 SPI | 2.82222 mm |
| 10 SPI | 2.54 mm |
| 11 SPI | 2.30909 mm |
| 12 SPI | 2.11667 mm |
| 14 SPI | 1.81429 mm |
| 16 SPI | 1.5875 mm |
| 18 SPI | 1.41111 mm |
| 20 SPI | 1.27 mm |
Quick answers
Quick answers
- How many SPI is 1 mm?
- 1 mm is 25.4 SPI.
- How many SPI is 10 mm?
- 10 mm is 2.54 SPI.
- How many SPI is 2.12 mm?
- 2.12 mm is 11.9811 SPI.
The units
About these units
Millimeters per stitch (mm)
Stitch length as machines set it.
Stitches per inch (SPI)
How many stitches fit in an inch.
Keep going