Thread Pitch Calculator

Convert between Threads Per Inch (TPI) and Metric Pitch (mm).

Convert From

TPI (Threads Per Inch)

Pitch (mm)

Conversion

Enter either TPI or Metric Pitch to convert.

About this calculator

Overview

Thread pitch is the distance between threads. In Imperial, it's counted as threads per inch (TPI). In Metric, it's the distance in millimeters.

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Pro Tips

Fun Facts

Formula: Pitch (mm) = 25.4 / TPI TPI = 25.4 / Pitch (mm)