Thread Calculator
Result
Thread Calculator Calculate thread dimensions: pitch diameter, minor diameter, and thread depth for UN or metric threads. — free online calculator.
Formula
- Thread Calculator calculates its result from Major, Tpi, Pitch. It uses the formula UN: PD = major − 0.649519/TPI; minor = major − 1.299038/TPI; Metric: minor = major − 1.2269×pitch. Change any input to recalculate the result instantly.
- The main inputs are Major, Tpi, Pitch. Enter them in the units and format shown in the calculator.
- Keep measurements and project assumptions consistent before comparing or combining values.
- Changing any input above recalculates the result with the same calculation engine used by this page.
Example: Thread
- Major: 2
- Tpi: 3
- Pitch: 4
Using Major = 2, Tpi = 3, Pitch = 4, the calculated result is -2.9076.
Sample result: Calculating…
Frequently asked questions
What does the Thread calculate?
Thread Calculator Calculate thread dimensions: pitch diameter, minor diameter, and thread depth for UN or metric threads. — free online calculator.
Which values should I enter?
Enter Major, Tpi, Pitch using the units and format shown beside each field.
What formula does this calculator use?
The calculator uses the following relationship: UN: PD = major − 0.649519/TPI; minor = major − 1.299038/TPI; Metric: minor = major − 1.2269×pitch.
Why might my result differ from another source?
Results can differ when another source uses different units, rounding rules, conventions or assumptions. Compare the inputs and definitions before comparing results.
Does the result update automatically?
Yes. Changing an input updates the result using the same calculation engine shown on this page.