How To Calculate
To calculate your requirements, measure the volume and round to the nearest metre. This means width x length x depth. For example, if you need an area of 10m x 6m with a depth of 0.1m, you will need 10 x 6 x 0.1 which is 6m³.
To calculate odd shaped areas, convert them into rectangles and the calculate the area for each.In both cases, round your answer up to the next cubic metre.