Spike's Calculators

Area and Perimeter

Circle - Metric

Spike VM

Calculate the area and perimeter (circumference) of a circle.
This calculator uses metres for measurements.

Circle = a round shape.


Circle Area and Perimeter - Metric

Diameter m
Decimal Precision


Area of the Circle
Square Metres
Square Feet ft²
Square Inches in²
Perimeter of the Circle
Metres m
Feet ft
Inches in


  1. the diameter of the circle in metres
  2. decimal precision, the number of digits after the decimal point


  1. the area of the circle in square metres
  2. the area in square feet
  3. the area in square inches
  4. the perimeter of the circle in metres
  5. the outer perimeter in feet
  6. the outer perimeter in inches

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

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)
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