Floor Casting Calculation per Meter: Easy and Accurate Steps

A concrete slab is a floor or building panel made of cast concrete, which usually functions as a barrier between floors.

Cast concrete itself is the main material used to make concrete slabs, and if the measurements are correct, the building will be more sturdy. Usually, cast concrete is calculated per meter.

To make it easier to understand, refer to the following guide on floor casting calculation per meter to help you calculate the materials needed.

Estimated Price of Floor Casting Contract per Meter

It is important to know that there are different types of floor casting based on the materials and methods used. These differences affect the cost, strength, and durability of the floor, so you can choose accordingly based on your needs and budget.

1. Concrete Slab Casting

Concrete slab casting is made from a mixture of cement, sand, gravel, and water to form the floor or roof of a building. This type of casting is strong and resistant to weather and heavy loads.

Here are the estimated prices for concrete slab casting. These figures are subject to change at any time, and the highest cost is usually for K600 concrete slab casting.

Types of Concrete	Price per m²
K225	IDR 825,000–IDR 850,000.
K250	IDR 840,000 – IDR 875,000.
K300	IDR 870,000 – IDR 905,000.
K350	IDR 900,000 – IDR 935,000.
K400	IDR 940,000 – IDR 975,000.
K450	IDR 980,000 – IDR 1,015,000.
K500	IDR 1,040,000 – IDR 1,075,000.
K600	IDR 1,095,000 – IDR 1,130,000.

2. Bondek Casting

Bondek casting uses corrugated steel plates that also serve as molds and additional supports under the floor. The process begins with installing the plates on top of concrete beams, adding iron reinforcement, and then pouring concrete evenly over them.

The installation cost of bondek casting is usually around IDR 230,000 per m² for the casting alone, excluding labor and other materials.

3. Keraton Casting

The price of keraton casting is lower than that of concrete slab casting. Keraton casting uses keraton beams as permanent molds, making it an alternative to a conventional slab.

The casting cost is around IDR 350,000 per m², excluding additional materials and labor costs. The advantage of keraton casting is that it is quick and practical to install.

Floor Casting Calculation per Cubic Meter

To determine the exact material requirements and costs, it is important to calculate the concrete casting material requirements. With accurate calculations, you can prepare the right amount of material and avoid waste. Several things to consider in the floor casting calculation per cubic meter include:

1. Way to Calculate Concrete Slabs

Calculating the cost of cast concrete per cubic meter involves several factors, including the slab area, the amount of material, and the mixture composition.

For example, suppose you have a concrete slab measuring 6 x 13 meters with a thickness of 12 cm, using 10 mm diameter steel bars, and a ring or stirrup spacing of 20 cm. Here is a simple way to calculate material requirements and costs.

Steel Material

In concrete slabs, 10 mm diameter steel bars are installed with a distance of 20 cm between bars. This means that 5 steel bars are needed for every 1 meter of slab length. Since the steel bars are installed in two layers, the total number of steel bars installed per meter of length is 5 x 2 = 10 bars.

When calculated per square meter of slab, with two installation directions (length and width), the total becomes 2 x 5 x 2 = 20 steel bars per square meter. This calculation method helps you prepare enough steel to ensure that the concrete slab is strong and safe.

Cement

For concrete slabs, the mixture typically used is a ratio of 1:2:3, which is 1 part cement, 2 parts sand, and 3 parts gravel. The amount of cement needed per square meter can be calculated by multiplying the ratio of cement to the slab volume. For example, the volume of cement is calculated as 1/6 × 0.12 = 0.02 m³.

One 50 kg bag of cement is usually sufficient to make concrete with a volume of about 0.024 m³. With this calculation, the cement requirement for making a 1 m² slab is 0.02 ÷ 0.024, or about 0.83 bags. This method helps you prepare the right amount of cement for your concrete slab project.

Sand

The sand requirement for making a 1 m² concrete slab is approximately 0.04 m³. This figure is obtained by calculating 1/6 × 0.12 = 0.04 m³. Knowing this amount, you can adjust the amount of sand based on the total area of the slab to be cast, ensuring the materials prepared are just right and not wasted.

2. Manual Cast Concrete Calculation per Cubic Meter

By knowing how to calculate cast concrete per cubic meter, you can prepare materials such as cement, sand, gravel, and steel as needed.

As an illustration, the use of cast concrete with specifications of a 6 x 13 meter slab and 15 x 30 cm beams using 6 steel bars with a diameter of 10 mm. The installed steel stirrups have a diameter of 8 mm with a distance of 20 cm.

Cast concrete material calculation

Total beam length: (6 bars x 6 m) + (3 bars x 13 m) = 75 m.
Beam concrete volume: 0.15 m x 0.30 m x 75 m = 3.375 m³.
Sand: 2/6 x 3.375 m³ = 1.125 m³.
Cement: (1/6 x 3.375 m³) ÷ 0.5625 ≈ 23–24 bags.
Gravel: 3/6 x 3.375 m³ = 1.6875 m³

Steel calculation

10 mm diameter concrete reinforcement steel: total length 450 m (for 38 bars).
8 mm diameter steel stirrups: total length 300 m, divided every 12 m = 25 bars.

With these steps, you can more easily calculate the manual cast concrete requirements per cubic meter and adjust them to the actual concrete slab size in the project.

That is an explanation of the floor casting calculation per cubic meter, starting with the estimated contract price and outlining the steps.

By understanding this method, you can plan your material purchases more accurately, manage your budget, and ensure that your concrete slab project runs efficiently without material shortages or surpluses.

Besides calculating the floor casting requirements per cubic meter, it is also important to choose the right building materials to ensure that the building remains strong, safe, and durable. Beton Merah Putih, part of Semen Merah Putih, is available as an option for sturdy and high-quality construction.

Various products are available to suit project needs, ranging from Ready Mix Concrete, Precast Concrete, to aggregates. All are manufactured to high standards to ensure that every part of the building has maximum strength and meets technical specifications.

With accurate floor casting calculations and the right material selection, you can ensure that the poured concrete slab is strong, safe, and durable.

To get the most suitable materials for your project, contact us now and realize your dream construction with high-quality building materials from Semen Merah Putih.