`A = 3(2+sqrt(3)) ( "s" )^2`

Enter a value for all fields

The Area of a Dodecagon formula, (A_dodecagon=3(2+?3)•s²), computes the area of a regular dodecagon, a polygon with 12 equal sides of length (s).
INSTRUCTIONS: Choose units and enter the following:

• s - the length of the sides of the dodecagon

Area of a Dodecagon(A): The area is returned in square meters.  However, the area can be automatically converted to many other units like square feet and acres via the pull-down menu.

For the Volume of a Dodecagon shaped column, CLICK HERE.

The Math / Science

A regular dodecagon has twelve equal sides and equal angles.  The formula for the area of a dodecagon is:

         A = 3•(2+?3)•s²

where:

• A is the area of a dodecagon
• s is the length of a side

For other area calculators see:

• Area of Circle - Circle approximates a polygon as the number of sides approaches infinity.
• Area of Triangle -  Three Sides
• Area of Quadrilateral - Four Sides
• Area of Pentagon - Five Sides
• Area of Hexagon - Six Sides
• Area of Heptagon - Seven Sides
• Area of Octagon - Eight Sides
• Area of Nonagon - Nine Sides
• Area of Decagon - Ten Sides
• Area of Hendecagon - Eleven Sides
• Area of Dodecagon - Twelve Sides
• Area of Polygon  -  Any number of sides (n).