Spike's Calculators

Area and Perimeter

Semicircle - Metric

Spike VM

Calculate the area and perimeter of a semicircle.

This calculator uses metres for measurements.

Semicircle = a circle cut in half along its diameter.


Semicircle Area and Perimeter - Metric

Diameter m
Decimal Precision


Arc Length
Area of the Semicircle
Square Metres
Square Feet ft²
Square Inches in²
Perimeter of the Semicircle
Metres m
Feet ft
Inches in


  1. the diameter of the semicircle.
  2. decimal precision, the number of digits after the decimal point


  1. the length of the arc
  2. the area of the semicircle in square metres
  3. the area in square feet
  4. the area in square inches
  5. the perimeter of the semicircle in metres
  6. the perimeter in feet
  7. the perimeter in inches
A = 𝝅/4D²/2;
P = 𝝅D/2+D
where A is the area of the semicircle
𝝅= 3.14159265
D the diameter
P  the circumference of the semicircle

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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