Type the number of standard cubic meters you wish to convert into your calculator. If you are not using a calculator, write it down on paper.
Multiply by the appropriate conversion factor. If you are converting SCM to U.S. liquid gallons, multiply by 264.172. If you are converting to U.S. dry gallons, multiply by 227.020. If you are converting SCM to British gallons, multiply by 219.969.
Calculate the number of gallons. For instance, if you wanted to convert 10 cubic meters to U.S. gallons, you would multiply 10 by 264.172 to get 2,641.72 gallons.