Taper Per Foot Calculator

Inputs

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Larger finished diameter at one end of the taper.
in
Smaller finished diameter at the other end of the taper. Reverse the two diameters if you want the sign to flip.
in
Axial length over which the diameter changes from D1 to D2.
in
Distance between centers used for the tailstock setover calculation. Enter zero if you only need taper and angle.
in

Results

Default result
Edit inputs
Taper per foot (TPF)
1 in

Diametral change over 12 in / 304.8 mm.

Also computed

Compound angle (alpha) Pass 2.3859 °

set compound to this angle from centerline

Half the included angle, measured from centerline.

Tailstock setover (S) 0.75 in

offset from spindle centerline

Setover for the entered center distance.

Included angle (2alpha) 4.7719 °

Taper per 100 mm (T100) 0.32808 in

Diametral change over 100 mm.

Taper per inch (TPI) 0.083333 in/in

Diameter change (DeltaD) 0.5 in

Method notes 4 notes
  • This is diametral taper: DeltaD = large diameter - small diameter over the axial taper length.
  • Taper per foot = DeltaD/L * 12 in. In SI mode the same per-foot change is shown as mm over 304.8 mm.
  • Compound angle is half the included angle: alpha = atan(DeltaD/(2L)).
  • Tailstock setover assumes a between-centers setup: S = DeltaD*C/(2L), where C is center distance.

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