Multiply the number of cubic meters by 264.172052358 to convert to gallons. For example, if you have 0.6 m^3, multiply 0.6 by 264.172052358 to get 158.5 gal.
Divide the number of cubic meters by 0.003785412 to convert to gallons. In this example, check your conversion by dividing 0.6 by 0.003785412 to confirm your answer of 158.5 gal.
Verify your conversion with an online cubic meters-to-gallons calculator (see Resources). Enter the number of cubic meters and the site displays the number of gallons.