Free thread calculator for screw and bolt measurements. Calculate thread depth, minor diameter, and pitch diameter for metric and imperial threads instantly.
Metric Thread Depth: h = 0.6134 × P
Imperial Thread Depth: h = 0.6134 × (25.4/TPI)
where P is the pitch in mm, TPI = threads per inch
Minor Diameter Formula: d₁ = d - 2h = d - 1.226868 × P
where d is the major diameter
Pitch Diameter Formula: d₂ = d - 0.6495 × P
where d is the major diameter
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