Thread Pitch Calculator
Pitch to TPI Converter
Convert metric pitch (mm) to threads per inch
TPI to Pitch Converter
Convert threads per inch to metric pitch (mm)
Common Thread Reference
Look up standard metric and imperial thread sizes
Formula
TPI = 25.4 / Pitch (mm) | Pitch (mm) = 25.4 / TPI
Frequently Asked Questions
How do I convert thread pitch to TPI?
Divide 25.4 by the pitch in millimeters. For example, a 1.5mm pitch = 25.4 / 1.5 = 16.93 TPI. Conversely, divide 25.4 by TPI to get pitch in mm.
What is the difference between UNC and UNF threads?
UNC (Unified National Coarse) has fewer threads per inch and is the most common standard. UNF (Unified National Fine) has more threads per inch, providing greater tensile strength and finer adjustment but is more prone to cross-threading.
You may also need
R
Torque Converter Calculator
Free torque unit converter. Convert between Newton-meters, foot-pounds, inch-pounds, and kilogram-centimeters instantly.
ConversionR
Unit Converter
Free unit converter. Convert between metric and imperial units for length, weight, and temperature. Instant results, no signup required.
ConversionR
AWG to mm² Wire Size Converter
Free AWG to mm² wire size converter. Convert American Wire Gauge to metric cross-sectional area (mm²) and diameter (mm). Includes resistance values.
Conversion