Concrete Calculator India
Estimate the exact volume in cubic metres and cubic feet, plus the number of 50kg bags needed for your slab or column.
Calculate Concrete for Slabs and Columns in India
Welcome to ConcreteCalculator.website. Whether you are casting a concrete slab for a new residential building or pouring circular columns, getting your material calculation right is crucial. In India, construction projects often switch between square feet and cubic metres. Ordering too much ready mix concrete wastes money, and falling short during a pour can compromise the structural strength.
Using our Indian concrete calculator is simple:
- Select your preferred measurement system. Use Metric if you work in metres, or Imperial if your plot and drawings are in feet and inches.
- Select what you are building: a concrete slab, a column or footing, or stairs.
- Enter your exact dimensions.
- Hit calculate to get your volume and see how many standard 50kg bags of premixed concrete you need.
How to Calculate Cubic Metres and Cubic Feet
If you want to do the material calculation manually, the formula is quite straightforward. You just need to ensure all your measurements are in the same unit before multiplying.
Cubic Metres Formula: Length in metres multiplied by Width in metres multiplied by Depth in metres.
Cubic Feet Formula: Length in feet multiplied by Width in feet multiplied by Depth in feet.
Example for an Indian plot: Let us assume you are pouring a room slab that is 10 feet long, 10 feet wide, and 6 inches thick. First, convert your 6 inches thickness to feet by dividing by 12, which gives you 0.5 feet. Now multiply: 10 times 10 times 0.5 equals 50 cubic feet of concrete. To convert cubic feet to cubic metres, simply divide by 35.31.
M15 and M20 Concrete Mix Ratios
In India, if you are mixing concrete on site instead of ordering ready mix concrete, you need to follow standard mix ratios using 50kg cement bags, sand, and aggregate.
| Concrete Grade | Mix Ratio for Cement Sand Aggregate | Common Use in India |
|---|---|---|
| M15 Grade | 1 part cement, 2 parts sand, 4 parts aggregate | Plain cement concrete and minor bases |
| M20 Grade | 1 part cement, 1.5 parts sand, 3 parts aggregate | Standard residential slabs and columns |
| M25 Grade | 1 part cement, 1 part sand, 2 parts aggregate | Heavy load bearing foundations |
Frequently Asked Questions
How do I calculate concrete volume in cubic feet?
To calculate volume in cubic feet, multiply the length in feet by the width in feet by the depth in feet. For example, a 10 feet by 10 feet slab that is 0.5 feet thick requires 50 cubic feet of concrete.
What is the ratio for M20 grade concrete?
The standard mix ratio for M20 grade concrete is 1 part cement to 1.5 parts sand and 3 parts aggregate. This is widely used for residential slabs and columns in India.
How many 50kg bags of premixed concrete make one cubic metre?
You will need approximately 45 standard 50kg bags of premixed concrete to make up one full cubic metre. If you are mixing from scratch, one 50kg bag of cement mixed with the proper ratio of sand and aggregate yields much more volume.
How to convert square feet to cubic metres for a concrete slab?
First calculate the total square feet of your slab. Then multiply it by the thickness in feet to get cubic feet. Finally, divide the total cubic feet by 35.31 to convert the volume into cubic metres.