Spike's Calculators
Area and Perimeter
Circle - Metric
Calculate the area and perimeter (circumference) of a circle.
This calculator uses metres for measurements.
Circle = a round shape.
Circle Area and Perimeter - Metric
Calculation
- the diameter of the circle in metres
- decimal precision, the number of digits after the decimal point
Results
- the area of the circle in square metres
- the area in square feet
- the area in square inches
- the perimeter of the circle in metres
- the outer perimeter in feet
- the outer perimeter in inches
Formula
A = 𝝅/4D² P = 𝝅D where A is the area of the circle 𝝅= 3.14159265 D the diameter P the circumference of the circle
Conversions
one metre (m) = 3.28083989501312 feet (ft) one metre (m) = 39.3700787401575 inches (in) one square metre (m²) = 10.7639104167097 square feet (ft²) one square metre (m²) = 1550.0031000062 square inches (in²)