construction calculator
Circle & Pipe Circumference / Area Calculator
Get the circumference and cross-sectional area of a circle or pipe from its diameter.
How it works
circumference = pi x diameter. area = pi x (diameter / 2)^2.
Worked example
A 6 in pipe: circumference = pi x 6 = 18.85 in; area = pi x 3^2 = 28.27 in2.
When to use it
- Diameter in, area out in the same unit squared — works for any consistent unit.
- Cross-sectional area feeds flow-rate and pipe-fill estimates.