Convert Turns per Foot to Turns per Meter (TPF to TPM)
1 turn per foot (TPF) = 3.280839895 turns per metre (TPM). 1 TPM = 0.3048 TPF. Example: 15 TPF = 15 × 3.280839895 = 49.21259843 TPM.
Also searched as turns per foot to TPM, turns per foot in TPM, turns per foot into turns per metre, TPF to TPM, TPF in turns per metre, TPF into turn per metre, turn per foot to turn per metre, TPF to turns per metre converter, turns per foot to turns per meter and how many turns per metre in a turn per foot.
1 TPF = 3.280839895 TPM
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk turn per foot to turn per metre converter to paste a column from Excel.
How to Convert Turn per Foot to Turn per Meter
- 1 TPF = 3.280839895 TPM
- 1 TPM = 0.3048 TPF
- Example: convert 15 TPF to TPM: 15 TPF = 15 × 3.280839895 TPM = 49.21259843 TPM
Formula
TPM = TPF × 3.280839895013
Derivation from SI units:
- 1 turn per foot = 1 turn per 0.3048 m = 3.280839895 TPM (exact)
- The SI-based unit of twist: complete turns of the yarn about its axis per metre of length.
Both units are defined exactly, so the factor is exact. Turn per Foot definition: turn per foot; Turn per Meter definition: turn per metre.
Worked examples
- A reading of 5 TPF converts to 16.40419948 TPM.
5 TPF × 3.280839895 = 16.40419948 TPM - A value of 12 TPF is 39.37007874 TPM.
12 TPF × 3.280839895 = 39.37007874 TPM
Turn per Foot to Turn per Meter conversion table
| Turns per Foot (TPF) | Turns per Meter (TPM) |
|---|---|
| 1 TPF | 3.280839895 TPM |
| 2 TPF | 6.56167979 TPM |
| 3 TPF | 9.842519685 TPM |
| 5 TPF | 16.40419948 TPM |
| 8 TPF | 26.24671916 TPM |
| 10 TPF | 32.80839895 TPM |
| 12 TPF | 39.37007874 TPM |
| 20 TPF | 65.6167979 TPM |
| 30 TPF | 98.42519685 TPM |
| 50 TPF | 164.0419948 TPM |
Where it's used
Turns per Foot are used for cords, ropes and tyre cords, while turns per metre appear in spinning and twisting specifications in metric mills. Both measure yarn twist (turns per unit length), so the conversion is a fixed factor.
Turn per Foot to other yarn twist units
| Conversion | 1 TPF equals |
|---|---|
| turn per foot to turn per metre | 3.280839895 TPM |
| turn per foot to turn per inch | 0.08333333333 TPI |
| turn per foot to turn per centimetre | 0.03280839895 TPcm |
Frequently asked questions
How many turns per metre are in 1 turn per foot?
1 TPF = 3.280839895 TPM.
How do I convert turns per foot to turns per metre?
Multiply the value in TPF by 3.280839895. For example, 15 TPF × 3.280839895 = 49.21259843 TPM.
Is the TPF to TPM conversion exact?
Yes. Both units are defined exactly, so the ratio is exact; its decimal form does not terminate and is shown here to 10 significant figures (more with the precision selector).
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".
- 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). Convert Turns per Foot to Turns per Meter (TPF to TPM). Retrieved October 25, 2026, from https://scientificconverters.com/yarn-twist/turns-per-foot-to-turns-per-meter/
IEEE
Scientific Converters, "Convert Turns per Foot to Turns per Meter (TPF to TPM)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/yarn-twist/turns-per-foot-to-turns-per-meter/