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DeWelopeTools

Octagon Calculator

Calculate the area, perimeter, apothem, and diagonal of a regular octagon from its side length using standard geometry formulas.

How to Use Octagon Calculator

The Octagon Calculator computes all key measurements of a regular octagon from its side length. Enter the side length and instantly get the perimeter (8 Ɨ side), area using the formula 2(1 + āˆš2) Ɨ sĀ², apothem (distance from center to midpoint of a side), and the longest diagonal. A regular octagon has eight equal sides and eight equal interior angles of 135Ā°. Common in architecture (stop signs, building designs), flooring patterns, and engineering. Essential for geometry students, architects, and designers working with octagonal shapes.

Step-by-Step Instructions

  1. Enter the side length of the regular octagon
  2. Click Calculate to compute all measurements
  3. View perimeter, area, apothem, and diagonal values
  4. Copy results with the formula shown

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