Spike's Calculators

Area and Perimeter


Spike VM

Calculate the area and perimeter of an ellipse. This calculator uses feet and or inches for measurements.

Ellipse = squashed circle


Ellipse Area and Perimeter

Length a ft in n
Length b ft in n
Decimal Precision


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


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


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

A = ab/4
P = 𝛑R(1+(3H)/(10+√(4-3*H)))
where A is the area of the ellipse
a length of the short diameter
b length of the l diameter
P the perimeter of the ellipse
𝛑 = 3.14159265
R = (a+b)/2
S = (a-b)/2
H = R²/S²

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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