Concrete Calculator

It's designed to be simple and effective. Plus, It's Free.

The calculator accurately figures concrete quantity and estimates cost for both ready-mix concrete and concrete bag mix.

It also calculates in both U.S and metric units.

To securely download it right to your desktop, simply click the link below:

Securely Download MMC Concrete Calculator for FREE at CNET

I looked around a lot... you will not find a more helpful concrete calculating tool anywhere else online. I plan to further improve it annually.

Please feel free to rate it on CNET (please just don't rate it based on appearance, I already know it's ugly). In order to calculate concrete manually, you'll need to know some basic information before you start figuring the numbers:

Concrete mix can be purchased in either 60 or 80 lb. bags

Here's the difference in the bag sizes:

60 lb. bags each contain 0.45 CF (cubic feet) of concrete.

80 lb. bags each contain 0.60 CF of concrete.

If you instead have concrete delivered it is sold by the cubic yard (a cubic yard = 27 cubic feet).

Concrete Calculating Formulas and Examples

These apply only to square or rectangular shaped pours, which are the most common:

Length (feet) x Width (feet) x (Thickness (inches) / 12) = cubic feet of concrete (CF)

for figuring bag concrete:

CF / 0.45 = needed 60 lb bags

CF / 0.60 = needed 80 lb. bags

Calculator formulas for concrete cubic yards needed:/ = divided by

CF / 27 = cubic yards

L = Length in feet

W = Width in feet

T = Thickness in inches

CF = Cubic feet of concrete

Example 1- Let's figure how many bags of concrete bag mix will be needed:

A patio 10' long by 10' wide - 6" thick

10 x 10 x (6"/ 12") = 50 cubic feet of concrete will be needed for your slab

those 50 cubic feet needed / 0.45 cubic feet per 60 lb bag = 111.1 (112) 60 lb bags of concrete ...or

50 CF / 0.6 = 83.3 (84) 80 lb. bags of concrete will be required for your pour.

Example 2- concrete calculator for cubic yards- if you plan to order ready-mix concrete:

Let's try a more advanced concrete calculator scenario for a slab that is 10' long by 10' wide by 4" thick:

10 ft x 10 ft x (4"/12") = gives you 33 cubic feet (CF) of concrete needed.

That's great and all, but concrete is sold by the cubic yard (CY). To determine the cubic yardage, the 33 CF must be converted to CY. Since we know that there are 27 cubic feet in a cubic yard,

Just divide 33 cf/27 cf per cy, which equals 1.2 cubic yards of concrete.

Note: You will probably need to order 1.5 cubic yards from the local supplier because they typically fill orders in 0.5 CY increments. Better to have a bit too much concrete than not enough, anyway.

I hope these concrete calculations were helpful to you and maybe even a bit of fun to go through. You are now empowered to order the right amount of concrete for your project.

More on Calculating Concrete

Return to Meet-Mr-Concrete Home Page

Your friends would be happy to know how this article helped you out. Share a quick comment with your Facebook friends about what you learned at Meet-Mr-Concrete.com today. Thank You!