Q:
# How Does a Concrete Slab Calculator Work?

A concrete slab calculator works by calculating the amount of concrete needed in cubic feet by multiplying together the values in feet for the length, width and depth of the concrete slab. The result is divided by 27 to get cubic yards.

Continue ReadingTo estimate the amount of concrete needed for a slab, a concrete calculator takes values entered by a user for the length, width and depth of the slab in feet. The calculator multiplies the values together to derive the volume of the slab in cubic feet. Pre-mixed concrete is sold in cubic yards, so this result is divided by 27, the number of feet in a cubic yard, to calculate the volume of the slab in cubic yards.

To determine the number of bags of pre-mixed concrete needed, the calculator uses a value for the density of the concrete in pounds and multiplies it by the calculated result to determine the total pounds of concrete. Dividing the result by the size of the bag gives the number of bags needed.

For example, a concrete slab that is 10 feet long, 3 feet wide and 6 inches deep is 15 cubic feet or 0.556 cubic yards in volume. Using a value of 133 pounds per cubic foot for the concrete density, the weight of concrete needed is 1,995 pounds. This is approximately 33 60-pound bags or 25 80-pound bags of concrete.

Learn more about Building Materials-
Q:
## How Is the Price Per Yard for Concrete Determined?

A: The price per cubic yard of concrete is determined by multiplying the desired finished length, width and depth of the concrete and dividing that number by ... Full Answer >Filed Under: -
Q:
## What Is the Formula for Concrete in Cubic Yards?

A: Multiplying the length, width and depth, converted to yards, of the area in question provides the amount of concrete needed in cubic yards. This formula is... Full Answer >Filed Under: -
Q:
## How Do You Calculate Concrete Yardage?

A: Multiply figures for length, width and thickness, measured in feet, and divide by 27 to determine the yardage of concrete required. Multiply the total yard... Full Answer >Filed Under: -
Q:
## How Do You Figure How Much Concrete to Use?

A: Figure out the amount of concrete to use by calculating the volume of the desired concrete slab and the footings supporting the slab, then converting this ... Full Answer >Filed Under: