Formula
taper=(D−d)/L; half angle=atan((D−d)/(2L)).
- Use the units shown beside each field.
- Results update automatically whenever you change an input.
- Displayed values use up to four decimal places, or scientific notation for very small or large numbers. Calculations use standard floating-point arithmetic; exact integer and fraction tools identify their own precision rules.
- Straight circular cone or frustum geometry. Does not select tool settings or tolerances.
Example Calculation
Example inputs
- Large diameter: 40 mm
- Small diameter: 20 mm
- Axial length: 100 mm
Diameters 40 and 20 mm over 100 mm give taper 0.2 and half-angle about 5.7106°.
Frequently asked questions
How do I use this calculator?
Enter large diameter, small diameter, axial length. The result updates automatically. Use Reset to restore the example values.
What method does it use?
taper=(D−d)/L; half angle=atan((D−d)/(2L)).. Straight circular cone or frustum geometry. Does not select tool settings or tolerances.
Why might a rounded result differ?
The calculation keeps full numeric precision internally, then rounds the displayed result. Rounding intermediate steps by hand can produce a slightly different answer.
Are my inputs saved online?
No. This calculator processes your inputs in your browser. A recently used list stores only calculator names on this device, not your entered values.
Check the assumptions and units before using this result. Read about calculation methods.