Convert metric thread pitch to inch thread pitch (tpi) instantly. Enter a value below, or use the formula and reference table further down the page.
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How to convert metric thread pitch to inch thread pitch (tpi)
Multiply the value by 1.
TPI = mm × 1Example: 10 mm = 10 TPI.
Metric Thread Pitch to Inch Thread Pitch (TPI) conversion table
| Metric Thread Pitch (mm) | Inch Thread Pitch (TPI) (TPI) |
|---|---|
| 1 mm | 1 TPI |
| 2 mm | 2 TPI |
| 3 mm | 3 TPI |
| 4 mm | 4 TPI |
| 5 mm | 5 TPI |
| 10 mm | 10 TPI |
| 15 mm | 15 TPI |
| 20 mm | 20 TPI |
| 25 mm | 25 TPI |
| 50 mm | 50 TPI |
| 100 mm | 100 TPI |
Frequently asked questions
How many inch thread pitch (tpi) is 1 thread pitch mm?
1 thread pitch mm equals 1 inch thread pitch (tpi).
What is the formula to convert mm to TPI?
To convert mm to TPI, multiply the value by 1. The full formula is: TPI = mm × 1.
How do I convert inch thread pitch (tpi) back to metric thread pitch?
Use the same calculator above and type your value into the inch thread pitch (tpi) field instead — it converts in both directions. Or use the reverse formula: mm = TPI ÷ 1.
Is the mm to TPI conversion exact?
The conversion factor used here (1) is the standard internationally defined value. Results on this page are rounded to four decimal places for readability.