# Octagon (Area, Perimeter & Side) Calculator

getcalc.com's **octagon calculator** is an online basic geometry tool to calculate area, perimeter & side of a octagonal shaped polygon, in both US customary & metric (SI) units.

## Steps to Find Area of a Octagon

The step by step workout for how to find what is the area of a octagon. Students may use this octagon calculator to generate work with steps for any other similar input values.__Workout :__

step1 Address the formula, input parameters and values

side = 10 in

step 2 Find Area of Octagon using side value

Area A = 2 (1 + √2 ) s²

= 2 x (1 + √2 ) x (10)² in²

= 2 x (1 + 1.4142 ) x 100 in²

= 2 x 2.4142 x 100 in²

Area A = 482.8427 in²

## Octagon & Formulas

**Octagon** is a polygon with eight straight sides and angles, a geometric shape on the two dimensional plane. K-12 students may refer the below formulas to know what are all the input parameters are being used to find the area, perimeter & side of octagon.