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.

octagon area, perimeter & side formula — Octagon formulas to calculate area, perimeter & side

Problems on Finding the Area & Perimeter of Octagon

Below are the practice problems for grade school students, on finding what is the area, side and perimeter of a octagon. By click on the corresponding problem shows the step-by-step calculation or work with steps for how to find such values of octagon mathematically. For any other similar values, use this octagon calculator to verify the results.