Skip to content
Calculator Tools
Fastener Calculators

Thread Pitch Calculator

Convert between thread pitch and threads per inch, with the standard metric coarse pitch.

Enter values

Results update as you type.

Result

Thread pitch

1.5 mm

Threads per inch
16.933
Thread height
0.9201 mm
Turns per 10 mm of travel
6.667
Tap drill size
8.5 mm
Minor diameter
8.376 mm
Pitch diameter
9.026 mm

About the Thread Pitch Calculator

Convert between thread pitch and threads per inch, with the standard metric coarse pitch.

Also known as: tpi to pitch, threads per inch, metric thread pitch, screw thread calculator.

How to use this calculator

  1. Enter i know the.
  2. The result updates instantly as you type — press Calculate (or Enter) at any time.
  3. Review the breakdown shown under the main result.
  4. Use Copy result or Share to save the answer or send a link with your inputs.

Formula

pitch (mm) = 25.4 ÷ threads per inch

Worked example

Using the values pre-filled in the calculator above:

  • I know the: Metric bolt size
  • Bolt size: M10

the calculator returns:

  • Thread pitch: 1.5 mm
  • Threads per inch: 16.933
  • Thread height: 0.9201 mm
  • Turns per 10 mm of travel: 6.667