Frustum Lateral Surface Calculator (A = π(R+r)l)
This calculator computes the frustum lateral surface: exact formula A = π(R+r)l, worked example R = 5, r = 3, h = 4 cm → l = 4.47, A = 112.40 cm².
- Free, instant, any units.
Figures are estimates from this calculator’s standard formula — adjust the inputs in the tool below for your exact number.
How the frustum lateral surface Calculator Works
The calculator applies the exact formula A_lat = π(R + r)·√((R − r)² + h²). Worked example: R = 5 cm, r = 3 cm, h = 4 cm → l = 4.47 cm, A_lat = 112.40 cm². Keep every input in one unit system and the result follows in square units (m², ft², cm²); full precision is kept until the final rounding. Radius fields expect radii — halve any diameter before entering it.
- 1
Enter the measurements
Type the values required by the formula for frustum lateral surface.
- 2
Check the units
One unit system throughout — cm, m, ft or in.
- 3
Read the result
The calculator substitutes, evaluates and rounds only at the end.
Use Cases
Paint and coating coverage for frustum lateral surface
Sheet-metal and cladding takeoffs
Checking homework against hand calculations
Tips
- 1
Area scales with the square of linear dimensions
- 2
Add overlaps and wastage before ordering material
- 3
Paint coverage: 1 L covers roughly 10 m² per coat
Common Mistakes
Mixing cm and m inputs — area then scales wrongly
Using diameter as radius quadruples the result
Forgetting flanges, rims and overlaps
FAQs
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