# How to Calculate Area of an Octagon

Written by mark kennan
• Share
• Tweet
• Share
• Pin
• Email

An octagon is an eight-sided figure, two-dimensional figure. You might need to find the area of an octagon is you were making a stop sign or if you were building an octagonal ring for an Ultimate Fighting Championship-style event. To calculate the area of an octagon, you need to know the length of the sides or the length of the radius of the octagon.

Skill level:
Moderately Easy

• Ruler
• Calculator

## Using the Side Length

1. 1

Measure the length of side of the octagon with the ruler.

2. 2

Square the length of the side. For example, if your sides are each 10 inches long, you would get 100.

3. 3

Multiply the result from Step 2 by 4.84 to calculate the area of the octagon. For example, you would multiply 100 by 4.84 to find that the area equals 484 square inches.

1. 1

Measure the radius with your ruler. The radius is the distance from the centre of the octagon to the point where any two sides intersect.

2. 2

Square the radius from Step 1. For example, if the radius equals 8 inches, you would get 64.

3. 3

Multiply the result from Step 2 by 2.828 to calculate the area. For example, you would multiply 64 by 2.828 to find that the area of the octagon equals about 180.992 square inches.

### Don't Miss

#### References

• All types
• Articles
• Slideshows
• Videos
##### Sort:
• Most relevant
• Most popular
• Most recent