# How do I calculate how much concrete I need?

How do I calculate how much concrete I need? | how to figure out how much concrete you need | calculation of concrete quantity in cubic yards, cubic feet, cubic meter, litres, gallon and cubic inches.

Concrete used for construction of residential, commercial and industrial structure, several projects like bridge, dams, reservoir, Highway Roadways driveway, french drainage system, patio, tunnels, base for retaining walls, drain construction, pavement, road, street, walkaway, and used for slab etc.

Concrete ready mix made of blended mix of Portland cement, sand gravel and other approved ingredient in a required proportion to achieve desired strength, concrete slab are used in patio making, walkway, driveway etc.

Ready mix concrete is mixture of Portland cement, sand and aggregate with some admixture like accelerator, reducer, plasticizer. Each ingredients of concrete required in adequate quantities according to achieve targeted compressive strength or design of a concrete structure.

For small project, it is better to use concrete bag. A bag of concrete have different weight such as 10kg, 20kg, 25kg, 30kg, 35kg and 40kg, which are used for many repairing work or new small projects, like patio, sidewalk, ramp etc.

In this article we know about how do I calculate how much concrete I need?, If you want to start new projects, there is necessary rough estimate which you know this. This will help you calculating make rough estimate about how much concrete do you need.

Required concrete quantity for slab will depend on thickness of slab and area of slab. Thickness of slab will be kept about 50mm, 100mm, 125mm thick. Area of slab will be Length multiply by Width. Volume of slab is Area of slab multiply by Thickness of slab in same measuring units.

The volume of concrete measured imperial and metric units, like in cubic meters, cubic feet, cubic yards, litres, gallons and cubic inches. Weight of concrete measured in kilograms (kg) and pound (lb) also.

Ready mix concrete can be used for building or repairing foundation walls, fence post, sidewalks, curbs, steps and ramps and for setting posts and others concrete structure like, footing, slab, beam and columns.

Metric density of Mix bag is around 2130 kg / m3 (2110 kg / m3 to 2150 kg / m3) and imperial density is about 133 lbs / ft3 (130 lbs / ft3 to 135 lbs / ft3). Metric density for structure 2300 kg / m3 (2240 kg / m3 to 2400 kg / m3) and for Reinforced concrete (ex slab or counter) 2400 kg / m3 (2300 kg / m3 to 2500 kg / m3).

## How do I calculate how much concrete I need?

To calculate how much concrete you need for slab in cubic meter, multiply the Length in meter by Width in meter by Thickness in cm. Then divide the resulting figure by 100 to get volume of concrete slab in m3.

The rule: The concrete quantity in m3 = the slab surface (m2) x the thickness (m). If you measured the length and width in meters and the thickness in cm or inches, you must convert the thickness measurement to meters (m) before calculating the volume.

For example, If your slab is 10 meter long by 10 meter wide, the Area is 100 square meter. If you want the slab to be 10cm deep, you’ll need 10m3 of concrete. 10 x 10 x 10 = 1000. Then 1000 divided by 100 = 10 cubic meters.

### The concrete quantity in cubic feet

To calculate how much concrete you need for slab in cubic feet, multiply the Length in feet by Width in feet by Thickness in inches. Then divide the resulting figure by 12 to get volume of concrete slab in cubic feet.

The rule: The concrete quantity in cubic feet = the slab surface (ft^2) x the thickness (in feet). If you measured the length and width in feet and the thickness in inches, you must convert the thickness measurement to feet before calculating the volume.

For example, If your slab is 30 feet long by 20 feet wide, the Area is 600 square feet. If you want the slab to be 4 inches deep, you’ll need 33.33 cubic feet of concrete. 10 x 10 x 4 = 400. Then 400 divided by 12 = 33.33 cubic feet.

### The concrete quantity in cubic yard

To calculate how much concrete you need for slab in cubic yard, multiply the Length in feet by Width in feet by Thickness in inches. Then divide the resulting figure by 324 (27 cubic feet equal to 1 yard) to get volume of concrete slab in cubic yard.

The rule: The concrete quantity in cubic yard = the slab surface (yd^2) x the thickness (in yard). If you measured the length and width in feet and the thickness in inches, you must convert the all measurements to yards before calculating the volume.

For example, If your slab is 30 feet long by 20 feet wide, the Area is 600 square feet. If you want the slab to be 4 inches deep, you’ll need 1.234 cubic yard of concrete. 10 x 10 x 4 = 400. Then 400 divided by 324 = 1.234 cubic yard.

### The concrete quantity in litres

To calculate how much concrete you need for slab in litres, multiply the Length in meter by Width in meter by Thickness in cm. Then multiply the resulting figure by 10 to get volume of concrete slab in litre.

The rule: The concrete quantity in Litre = 【(the slab surface (m2) x the thickness (cm) × 10】 .

For example, If your slab is 10 meter long by 10 meter wide, the Area is 100 square meter. If you want the slab to be 10cm deep, you’ll need 10000 Litres of concrete. 10 x 10 x 10 = 1000. Then 1000 multiply by 10 = 10, 000 litres.

### The concrete quantity in cubic inches

To calculate how much concrete you need for slab in cubic inches, multiply the Length in feet by Width in feet by Thickness in inches. Then divide the resulting figure by 144 to get volume of concrete slab in cubic inches.

The rule: The concrete quantity in cubic inches = the slab surface (ft^2) x the thickness (in feet) × 1728.

For example, If your slab is 10 feet long by 10 feet wide, the Area is 100 square feet. If you want the slab to be 4 inches deep, you’ll need 57,600 cubic inches of concrete. 10 x 10 x 4 = 400. Then 400 multiply by 144 = 57,600 cubic inches.

◆ How many yards in a bag of concrete

◆ Concrete calculator in yards- how much concrete do you need

◆ How many cubic feet in a bag of concrete

◆ How much does concrete weight

◆ How much is a yard of concrete

Conclusion:

To calculate how much concrete you need for slab, multiply the Length in meter by Width in meter by Thickness in cm. Then divide the resulting figure by 100 to get volume of concrete slab in m3.