Engineering CalculationYarn Twist Calculator - TPI, TPM and Twist Multiplier
Find twists per inch and per metre from the twist multiplier and yarn count, or find the twist multiplier from a measured TPI.
Open the calculator →Formula
TPI = TM × √Ne
TPM = TPI × 39.37
Worked example
Twist multiplier 3.8, 30 Ne
TPI = 3.8 × √30 = 20.81; TPM = 819
Where engineers use it
- Ring frame settings
- Quality checks on yarn twist
- Draft and twist change pinions
How to use
- Click Open the calculator. It runs free in your browser, on desktop or phone.
- Enter your values. Units and typical ranges are shown next to each input.
- Read the result and the step-by-step working, then print or add it to your Project BOQ.
Questions
Does it find change pinions?
Yes, the Draft and Twist Change Pinions (DCP / TCP) calculator is in the Textile suite.