Learn to be an effective concrete calculator.Let's figure cubic yards & bags for your slab so you don't over- or under- buy on material... and waste your valuable time & moneyWhen "becoming a concrete calculator ," you 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). The formula stuff...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 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 pre-mixed 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 16.66/27 which equals 1.2 cubic yards of concrete that you can order from the friendly neighborhood concrete supplier. I hope these examples were helpful to you and maybe even a bit of fun to go through. New for 2010, I have created a concrete calculator that calculates cubic yardage, cubic meters, and concrete bags needed. And to boot, it estimates the cost of the calculated concrete. You can download it right to your desktop for free! It's a simple one-click download and you will not find a more helpful concrete calculator anywhere else online. If you have any questions about figuring concrete, please don't hesitate to shoot me an email. Return to Calculating Concrete
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