Thread Pitch Calculator

Find thread pitch from TPI, or vice versa.

Pitch 0.05

Pitch 1.27

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

Step-by-step with your numbers:

1. Values used:

2. Threads per inch (TPI) = 20

4. Pitch = 0.05

5. Pitch = 1.27

Did we solve your problem today?

Convert threads per inch to pitch (the distance from one thread crest to the next).

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).