Construction

Thread Pitch Calculator

Find thread pitch from TPI, or vice versa.

Calculated Output

Pitch 0.05

Pitch 1.27

Formula: pitch (in) = 1 ÷ TPI ; pitch (mm) = 25.4 ÷ TPI

Step-by-Step Breakdown

1. Values used:

2. Threads per inch (TPI) = 20

4. Pitch = 0.05

5. Pitch = 1.27

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The math behind it

pitch (in) = 1 ÷ TPI; pitch (mm) = 25.4 ÷ TPI.

20 TPI → 0.05 in (1.27 mm) pitch.

Metric?

Metric threads give pitch directly (e.g. M8 × 1.25 means 1.25 mm pitch).