Cone Surface Area Calculator
Find total area of a closed right circular cone.
Open toolTorus Surface Area Calculator
Find ring torus area as 4π²Rr. All lengths must use the same unit.
Free to useNo sign-upRuns in your browser
Enter your details
Enter the inputs, then select Calculate.
Your result
Enter your details
Result will appear here
How Torus Surface Area Calculator works
Find ring torus area as 4π²Rr.
All lengths must use the same unit. Area uses squared units and volume uses cubed units. Finite real inputs; output uses up to 12 significant digits. Floating-point results may be rounded. Major radius must exceed minor radius; self-intersecting tori are excluded. Finite real inputs; output uses up to 12 significant digits. Floating-point results may be rounded.
How to use Torus Surface Area Calculator
Follow the labelled inputs.
Enter major radius, centre to tube centre
Replace the example with major radius, centre to tube centre. The field labels specify the expected format and units.
Input and settings
Tool result
Run, review and save
Select Calculate. Review the calculated result, then copy it or download the result text.
Review the details
Examples and uses for Torus Surface Area Calculator
Check the supplied example
The starting example produces 118.435252813. Find ring torus area as 4π²Rr.
Use your own inputs
Read the labels for major radius, centre to tube centre and minor tube radius. All lengths must use the same unit.
Record a reviewed result
Copy the calculated result into your notes. Keep the formula and assumptions with it if someone else needs to reproduce the calculation.
How to read the result
Read the units and assumptions with the output.
Find ring torus area as 4π²Rr.
All lengths must use the same unit. Area uses squared units and volume uses cubed units. Finite real inputs; output uses up to 12 significant digits. Floating-point results may be rounded. Major radius must exceed minor radius; self-intersecting tori are excluded. Finite real inputs; output uses up to 12 significant digits. Floating-point results may be rounded.
Supported input and limits
Check the stated scope before you run it.
All lengths must use the same unit. Area uses squared units and volume uses cubed units. Finite real inputs; output uses up to 12 significant digits. Floating-point results may be rounded. Major radius must exceed minor radius; self-intersecting tori are excluded. Finite real inputs; output uses up to 12 significant digits. Floating-point results may be rounded.
The input stays in this browser. Copy result and Download save the same displayed text.
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Open toolTorus Surface Area Calculator: common questions
Answers about using Torus Surface Area Calculator and understanding its results.
What assumptions and input limits apply?
All lengths must use the same unit. Area uses squared units and volume uses cubed units. Finite real inputs; output uses up to 12 significant digits. Floating-point results may be rounded. Major radius must exceed minor radius; self-intersecting tori are excluded. Finite real inputs; output uses up to 12 significant digits. Floating-point results may be rounded.
How can I save the output?
Use Copy result to copy the displayed text, or Download to save it as a text file. The tool runs in your browser and does not require an account.
Calculate with your input
Check the calculated result, then copy or download it.