Turn per Foot (TPF)
Turns per foot is used for cords, ropes and cables, where twist is low: 12 turns per foot equals 1 TPI.
Symbol: TPF
Quantity: yarn twist (turns per unit length)
SI relation: 1 TPF = 3.280839895013 TPM (exact)
Derivation: 1 turn per foot = 1 turn per 0.3048 m = 3.280839895 TPM (exact)
Exact: yes, by definition
Typical uses
- Cords, ropes and tyre cords
- Cable lay
Convert turns per foot to other units
| Conversion | 1 TPF equals | Reverse |
|---|---|---|
| turn per foot to turn per metre | 3.280839895 TPM | turn per metre to turn per foot |
| turn per foot to turn per inch | 0.08333333333 TPI | turn per inch to turn per foot |
| turn per foot to turn per centimetre | 0.03280839895 TPcm | turn per centimetre to turn per foot |
Open the Yarn Twist Converter to convert any value between all units.
Sources
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "foot".
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 Foot (TPF). Retrieved October 25, 2026, from https://scientificconverters.com/units/turn-per-foot/
IEEE
Scientific Converters, "Turn per Foot (TPF)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/units/turn-per-foot/