Spike's Calculators

Area and Perimeter

Equilateral Triangle - Metric

Spike VM

Calculate the area and perimeter of an equilateral triangle.
This calculator uses metres for measurements.

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

equilateral triangle

Equilateral Triangle Area and Perimeter

Side Length m
Decimal Precision


Height m
Area of the Equilateral Triangle
Square Metres
Square Feet ft²
Square Inches in²
Perimeter of the Equilateral Triangle
Metres m
Feet ft
Inches in


  1. the length of a side in metres
  2. decimal precision, the number of digits after the decimal point


  1. the height of the equilateral triangle in metres
  2. the area of the equilateral triangle in square metres
  3. the area in square feet
  4. the area in square inches
  5. the perimeter of the equilateral triangle in metres
  6. the perimeter in feet
  7. the perimeter in inches
A = ab/4
P = 𝛑R(1+(3H)/(10+√(4-3*H)))
where A is the area of the equilateral triangle 
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 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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