# Octagon Shaped Volume Calculators

In a regular Octagon there are eight straight, equal length sides and eight inside corners that total 135°. To calculate the volume of an Octagon shaped slab you need to provide the length of one of these sides and the required depth of the slab.

## Octagon Shaped Volume Calculator - Imperial

## Octagon Shaped Volume Calculator - Metric

### When Ordering Concrete

This concrete calculator will help you in estimating the amount of concrete needed for your project. The amount given as needed, does not include any waste. It is recommended, depending on the job you are doing, to add anywhere from an extra 4% to 10% to your concrete order to make sure you have enough concrete to finish the job. Ask when ordering the concrete. They will be able to give you a good idea of what is needed.##### Imperial

Complete FoundationColumns

Column + Pad

Footings

Footing + Wall

Foundation Wall

Pads

Rectangle Post + Pad

Slabs

Stairs

Stairs - Round

##### Metric

Complete FoundationColumns

Column + Pad

Footings

Footing + Wall

Foundation Wall

Pads

Rectangle Post + Pad

Slabs

Stairs

Stairs - Round

##### Shapes using Imperial & Metric Measurements

CircleCircle - Metric

Donut

Donut - Metric

Equilateral Triangle

Octagon

Oval

Pentagon

Scalene Triangle

Trapazoid

Plastic Concrete Footing Form