Spike's Calculators

Area and Perimeter

Spike

Area and perimeter (circumference) calculators for various shapes, and calculators to calculate the square footage of a building lot, the perimeter of an acreage, and for comparing the area of different shapes to each other.

Choose Imperial or Metric measurements to make your calculations.

Circle

Circular Segment

Diamond

Ellipse

Equilateral Triangle

Half Square Triangle

Hexagon

Isosceles Trapezoid

Isosceles Triangle

Multiple Shapes

Octagon

Parallelogram

Pentagon

Pentagram

Pentagram

Polygon

Quatrefoil

Rectangle

Right-Angled Trapezoid

Right-Angled Triangle

Scalene Trapezoid

Semicircle

Square

Stadium

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