Strip Footing Calculator

Estimating Strip Footing Concrete

A strip footing is a continuous concrete footing that runs beneath load-bearing walls, spreading the wall load evenly along its length. This calculator works out the concrete volume using length (m) × width (m) × depth (m), with your width and depth entered in millimetres and converted automatically.

You can choose a 5 per cent or 10 per cent waste allowance depending on how much variation you expect on site — 10 per cent is a sensible allowance for irregular trenches or where over-excavation is likely. The calculator also converts your recommended order volume into 6 m³ truck loads, which is the standard agitator size for most residential deliveries, so you know roughly how many loads to schedule.

What Information You Need To Enter

Enter your total footing length in metres, footing width and depth in millimetres, and choose a waste allowance of 5 or 10 per cent.

Understanding Your Results

You will see the concrete required, your recommended order volume including waste allowance, the approximate concrete weight in tonnes, the excavation volume (equal to the concrete volume, since the trench is filled with concrete), and the number of 6 m³ truck loads needed.

Why Accurate Estimating Matters

Strip footings are often poured directly from an agitator truck, so knowing how many loads to book avoids delays waiting on an extra delivery or paying for a part-load you did not need.