Yarn Twist Conversion Chart

Printable yarn twist conversion tables for the most-used conversions. Values are exact or rounded to 6 significant figures. Free to print and share with the credit line “Scientific Converters (scientificconverters.com)”.

Download PNG chart Open the Yarn Twist Converter

turn per inch to turn per metre

turn per inch to turn per metre conversion chart
TPI	TPM
3	118.11
5	196.85
8	314.961
10	393.701
12	472.441
15	590.551
16.1	633.858
18	708.661
20	787.402
25	984.252

turn per metre to turn per inch

turn per metre to turn per inch conversion chart
TPM	TPI
100	2.54
200	5.08
300	7.62
400	10.16
500	12.7
600	15.24
700	17.78
800	20.32
1000	25.4
1200	30.48

turn per inch to turn per centimetre

turn per inch to turn per centimetre conversion chart
TPI	TPcm
3	1.1811
5	1.9685
8	3.14961
10	3.93701
12	4.72441
15	5.90551
16.1	6.33858
18	7.08661
20	7.87402
25	9.84252

turn per centimetre to turn per inch

turn per centimetre to turn per inch conversion chart
TPcm	TPI
1	2.54
2	5.08
3	7.62
4	10.16
5	12.7
6	15.24
8	20.32
10	25.4
12	30.48
15	38.1

Source: Scientific Converters (scientificconverters.com), data version 2026-10-15. Factors from NIST SP 811 and the BIPM SI Brochure. Licence: CC BY 4.0.