Spike's Calculators

Area and Perimeter

Octagon - Metric

Spike VM

Calculate the area and perimeter of a octagon.
This calculator uses metres for measurements.

Octagon = a shape with eight equal-length sides.


Octagon Area and Perimeter - Metric

Side Length m
Decimal Precision


Short Diagonal Length (sd) m
Side to Side Length (ss) m
Long Diagonal Length (ld) m
Area of the Octagon
Square Metres
Square Feet ft²
Square Inches in²
Perimeter of the Octagon
Metres m
Feet ft
Inches in


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


  1. length of the long diagonal (ld) in metres
  2. side to side length (ss) in metres
  3. length of the short diagonal (sd) in metres
  4. the area of the octagon in square metres
  5. area in square feet
  6. the area in square inches
  7. the perimeter of the octagon in metres
  8. the perimeter in feet
  9. the perimeter in inches
A = 4.8284271a²
P =a8
where A is the area of the octagon
a is the length of a side
P the perimeter of the octagon

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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