**HOW TO USE THIS CONCRETE CALCULATOR & CEMENT CALCULATOR:**

**"How many bags of concrete do I need?" you ask. Determining concrete cubic yards is a formula of volume**; thus, there are **three dimensions -- length, width and depth** (or height) -- factored into the above concrete calculator for slabs, square footings or walls. Below are the **steps needed via this construction calculator to determine volume manually**:

- First, record all measurements in feet -- length, width and depth. Divide any inch measurements by 12 to convert numbers into feet.
- Second, multiply those three measurements together, yielding a result in cubic feet.
- For footings, add up the total length of the footings and then multiply by the width and depth. Then, simply multiply by the depth of the footings to yield the volume of concrete.
- Finally,
**add up all the volumes calculated and then divide by 27 to get cubic yards**. (The reason for dividing by 27 is that there are 3 feet in a yard; therefore, a cubic yard is 3 * 3 * 3 = 27 cubic feet.)

**Cement trucks generally hold 10 cubic yards of concrete**, so this cubic yard calculation can help determine how many truckloads will be required.

Concrete bags are usually sold per cubic yards; and we advise rounding up to the nearest half-yard to allow wiggle room. **To determine the number of bags of concrete needed, first calculate the total yardage as described above; and then utilize the below conversions below to figure quantity of bags:**

**3600 pounds of concrete in bags = one cubic yard of concrete**. However, this isn't necessarily the true weight of the concrete since bags are mixed with other materials to constitute concrete; and **concrete density can vary significantly depending upon the application**. For example and for the sake of calculations, the **approximate density of "typical" concrete is 150 pounds/ft3 or 4050 pounds/yd3** (or 2400 kg/m3 in metric units.)

Whereas, "lightweight" concrete is about 109 lb/ft3 or 2950 lb/yd3 (or 1750 kg/m3.)

*90 forty-pound bags equal 1 cubic yard of concrete*
*60 sixty-pound bags equal 1 cubic yard of concrete*
*45 eighty-pound bags equal 1 cubic yard of concrete*
- Or more generally and as stated earlier, 1 cubic yard of concrete equals 3600 pounds of concrete.

When you're ready to roll with your **concrete construction project**, you can rely on Longwood-based concrete company and concrete contractor ACCG, Inc.; proudly and expertly serving Orlando area and central Florida!