Spike's Calculators

Area and Perimeter

Equilateral Triangle

Spike VM

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

Equilateral triangle = a triangle with three sides of the same length.


Equilateral Triangle Area and Perimeter

Side Length ft in n
Decimal Precision


Height ft²
Area of the Equilateral Triangle
Decimal Square Feet ft²
Square Feet ft² in²
Decimal Square Inches in²
Square Inches in²
Square Metres
Perimeter of the Equilateral Triangle
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 height in decimal feet
  2. the area of the equilateral triangle 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 equilateral triangle 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 = 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 long 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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