Spike's Calculators

Area and Perimeter


Spike VM

Calculate the area and perimeter (circumference) of a semicircle. This calculator uses feet and or inches for measurements.

Semicircle = a circle cut in half along its diameter


Semicircle Area and Perimeter

Diameter ft in n
Decimal Precision


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


  1. side length in feet and or inches
  2. decimal precision, the number of digits after the decimal point


  1. the length of the arc in feet
  2. the area of the semicircle in decimal square feet
  3. area in square feet and inches
  4. the area in decimal square inches
  5. the area in square inches
  6. the area in square metres
  7. the perimeter of the semicircle in decimal feet
  8. the perimeter in lineal feet and inches
  9. the perimeter in decimal inches
  10. the perimeter in inches
  11. the perimeter in metres

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 square foot ( ft²) = 144 square inches (in²)
one square inch (in²) = 0.00694444444444443 square feet (ft²)
one square foot ( ft²) = 0.09290304 square metres (m²)
square inch (in²) = 0.00064516 square metres (m²)
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