Turn per Meter (TPM)
Turns per metre (TPM) counts the complete twists a yarn makes about its axis in one metre. Ring-spun cotton yarns run about 500–1100 TPM, finer yarns higher.
Symbol: TPM
Quantity: yarn twist (turns per unit length)
SI relation: TPM is the coherent SI unit of yarn twist.
Derivation: The SI-based unit of twist: complete turns of the yarn about its axis per metre of length.
Exact: yes, by definition
Typical uses
- Spinning and twisting specifications in metric mills
- Twist multiplier αm = TPM ÷ √Nm
- Yarn testing with twist testers (ISO 2061)
Convert turns per metre to other units
| Conversion | 1 TPM equals | Reverse |
|---|---|---|
| turn per metre to turn per inch | 0.0254 TPI | turn per inch to turn per metre |
| turn per metre to turn per centimetre | 0.01 TPcm | turn per centimetre to turn per metre |
| turn per metre to turn per foot | 0.3048 TPF | turn per foot to turn per metre |
Open the Yarn Twist Converter to convert any value between all units.
Sources
- ISO 1144, Textiles — Universal system for designating linear density (Tex System), International Organization for Standardization , Metric designation of yarn twist.
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Turn per Meter (TPM). Retrieved October 25, 2026, from https://scientificconverters.com/units/turn-per-meter/
IEEE
Scientific Converters, "Turn per Meter (TPM)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/units/turn-per-meter/