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Thread lead and feed calculator
Pitch measures adjacent thread spacing; lead measures axial advance in one revolution. They differ on a multiple-start thread. This tool does not calculate thread class, truncation, allowances, gauge planes or finished diameters.
Formula and inputs
Lead = pitch × starts; feed per minute = RPM × lead.
Worked example
A two-start thread at 1.5 mm pitch advances 3 mm per revolution. At 300 RPM that is 900 mm/min.
Use the result in your setup
Confirm the input dimensions and unit system against your drawing before calculating. Keep full precision during a calculation and round only the final value to suit the measurement or programming requirement. A numerical result does not account for a machine’s complete setup, workholding or control configuration.