How much?

how much 2-row is the equivilent of 2 cans of coopers extract?

Dkidwell83 said:

how much 2-row is the equivilent of 2 cans of coopers extract?

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How many pounds are the cans?

According to Beersmith, a 3 pound can of liquid extract is equivlent to 4 pounds of 2-row, assuming a 75% efficiency.
Assuming a 65% efficiency (more likely for a beginning ag brewer), you would need about 4.75 poounds to equal 3 pounds of liquid extract.

how can you check your efficiency

Your efficiency can only be determined by comparing the recipe's OG range to your results. Every AG setup is different.

Efficiency is the rate of conversion and extraction of sugars from the malt as compared to a theoretical maximum yield, expressed in parts per pound per gallon (ppppg). Let say a 2-row pale malt has a potential yield of 1.037ppppg. That means that if you mash one pound of grain in 1 gallon of water, and you ended up with an O.G. of 1.037 you would have achieved 100% efficiency. Of course no one can get every bit of starch to convert, nor can you rinse every bit of converted sugar off of the grain, so a typical brewhouse efficiency is around 70-80%. Lots of factors contribute to brewhouse efficiency including: crush, equipment, mash temp, sparge type/rate, dead space/loses, quality/age of grains, etc. The only way to know your efficiency is to brew a few all-grain batches and take measurements with a hydrometer. If you have never brewed all-grain, a good number to start with might be 65%. If you manage better than that you'll just end up with a little stronger beer, and that's not all bad.