Cylinder surface area
Cylinder total surface area S = 2πr² + 2πrh: enter the radius and height to get the total area plus base, lateral area and volume in one pass; values are rounded to 6 decimals and non-positive input is rejected.
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Result
One quantity per line, ready to copy.
Enter a radius to calculate
What this tool does
- Check the cylinder surface area from a drawing and get the surface area needed for paint or plating.
- Trial different radii and heights to compare volume and material use.
- Verify the formulas: base πr², lateral 2πrh, total 2πr² + 2πrh.
Example
Input
2
Output
半径 2 高 3 的圆柱全面积：62.831853 底面积 πr²：12.566371 侧面积 2πrh：37.699112 全面积 2πr² + 2πrh：62.831853 体积 πr²h：37.699112 长度单位 u，面积 u²，体积 u³
At radius 1 and height 1 the output matches the canonical values (π ≈ 3.141593, 2π ≈ 6.283185, 4π ≈ 12.566371).
Frequently asked questions
Which units are used?
Any length unit works as long as the radius and height share it; areas come out in square units and volumes in cubic units. The tool does not convert units, so 1 m and 100 cm are different numbers.
Why only 6 decimals?
Powers and π produce long floating point tails; rounding to 6 decimals keeps the useful precision without noise like 3.141592653589793.
What if the radius is 0?
It reports an error instead of returning 0. A zero radius collapses the cylinder into a line — the formula still evaluates but the answer is meaningless, so non-positive input is rejected.
Keywords：圆柱表面积Cylinder surface area圆柱cylinder几何计算geometry表面积