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Cone Calculator
Calculate the volume, slant height and surface area of a right circular cone.
Cone calculator
Volume: —
Slant height: —
Lateral area: —
Total surface area: —
Apex angle: —
How to use the Cone Calculator
- Enter the radius of the circular base.
- Enter the perpendicular height of the cone.
- Read the volume, slant height and surface areas.
Features
- Volume from radius and height
- Slant height using Pythagoras
- Lateral and total surface area
- Apex angle in degrees
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Frequently Asked Questions
Common questions about the free online cone calculator.
Enter the base radius and the height. The tool uses one third of pi times the radius squared
times the height and shows it instantly.
Volume is one third of the base area multiplied by the height, written as V = pi r squared h
divided by three.
The slant height is the square root of the radius squared plus the height squared, taken
straight from the Pythagorean theorem.
Total surface area is the base circle plus the curved side, so pi r squared plus pi r times
the slant height.
The apex angle is the opening at the tip of the cone, equal to twice the arctangent of the
radius divided by the height.
No. The cone maths runs entirely in your browser, so your measurements never leave your
device at all.
Yes. The calculator is fully responsive and works on desktop, tablet and phone screens of any
size.
Yes. The cone calculator is completely free, unlimited and requires no account, sign-up or
installation.
Last updated: October 10, 2026