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Results
Enter your dimensions above and the results appear here.
About the Cone Calculator
The cone calculator is a free online tool: volume, slant height and surface area. Enter base radius (r) and height (h) and the results update instantly, alongside a labelled diagram so you always know which measurement goes where.
Choose your input unit (mm, cm, m, km, in, ft or yd) and optionally show the results in a different one: lengths, areas and volumes are converted correctly. Every answer shows the formula behind it, and the calculation runs in your browser, so nothing is uploaded.
Cone Calculator example
Base radius (r) = 4 cm
Height (h) = 9 cmVolume = 150.7964 cm³
Slant height = 9.8489 cm
Lateral surface area = 123.7644 cm²
Total surface area = 174.0299 cm²
Base area = 50.2655 cm²
Half-angle at the tip = 23.9625 °How to use the Cone Calculator
- Pick the unit your measurements use. All dimensions must share the same unit.
- Enter base radius (r) and height (h). Focus a field to highlight the matching label on the diagram.
- Read the results as you type. The largest card is the main answer; the others are the related measurements.
- Copy a single value, copy everything, or share a link that keeps your inputs.
Cone Calculator FAQ
What formulas does the cone calculator use?
V = ⅓πr²h; l = √(r² + h²); Lateral SA = πrl; Total SA = πr(r + l).
Can I use different units?
Yes. Pick the input unit and, if you like, a different output unit. Area results are shown in squared units and volumes in cubed units.
Is this cone calculator free and private?
Yes. It is free with no sign-up, and calculations happen on your device, so your numbers are never sent to a server.
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