# Octagon Measurement Calculator

The side length, height, diagonals, and area of a regular octagon are all interrelated. If you know the measure of one dimension, you can calculate the others. For example, if the side length is **s**, the height **h**, the main diagonal **d**, the minor diagonal **c**, the area **a**, and the perimeter **p**, then you can calculate the following from **s**:

h = (1+√2)s

d = (√4+2)s

c = (√2+)s

a = (2+2√2)s²

p = 8s

Similarly,

s = h/(1+√2) = 0.5(√2 - 1)h

d = 0.5(√2+)h, etc.

You can perform these computations using a hand calculator, our online scientific calculator, or the convenient octagonal measurement calculator at left. All results are accurate within 5 decimal places.

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