What do you need to order? Pick a shape, enter the sizes, and read the estimate.
Slab / Wall
Flat pours: slabs, patios, walls and square footings.
Covers spillage, uneven ground and over-excavation. 5–10% is common.
Use the yield printed on your bag; it varies by brand.
| Base volume | 4 × 3 × 0.1 = 1.2 m³ |
|---|---|
| Allowance | +10% |
| Order volume | 1.2 × 1.1 = 1.32 m³ |
| Density | 2,400 kg/m³ |
| Weight | 1.32 × 2,400 = 3,168 kg |
| Bag yield | 11.7 L per bag |
| Bags | 1,320 L ÷ 11.7 L = 112.8 → 113 |
| Dry mix | 113 × 25 kg = 2,825 kg |
Bag weight is dry mix only, so it is lower than the finished weight above, which includes water. Bag count comes from the manufacturer's yield, not from weight.
Knowing how much concrete you need from the batching plant is important when starting a project that relies on this material.
How many square meters are there in a cubic meter of concrete?
To answer this question, we need to know the exact volume to be filled during the concrete pour—the quantity of material required to fill a space defined by three dimensions: length (L), width (W), and height/thickness (H).
By multiplying these dimensions (L x W x H), we determine the volume within the formwork. If reinforcement is present, its volume can be subtracted from the total.
What is the calculation formula?
V = L x W x H
Important: All three dimensions must be converted to the same unit of measurement (e.g., a screed with a height of 20 cm must be expressed in meters, so it becomes 0.20 m).
EXAMPLE:
To illustrate, we will calculate the cubic meters of concrete needed to cover an area 25 meters long, 1.5 meters wide, and 20 centimeters thick.
The first step is to convert the 20 centimeters into meters.
The formula is: 20 cm / 100 = 0.20 m.
Next, use this formula: 25 m x 1.5 m x 0.20 m = 7.5 cubic meters.
To simplify the process, we provide an online calculator that helps you perform these calculations quickly and easily.
The calculator provides additional elements such as: