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1. Measure the length (L). For an example, let's say it's 12 feet 6 inches (15.2 cm).

2. Measure the width (W). For example, let's say its 15 feet (4.6 m).

3. Measure the Height (H). Fro example lets say its 3 and 3/4 inches.

4. Use a construction calculator. Do search online to find them.

5. If you're calculating for cubic feet or cubic yards of concrete needed, you will need to convert your inch measurements to Engineers Scale. Engineers scale is basically taking a foot (12 inches) and converting it into10ths. The engineers scale also eliminates the  fractions of an inch. (i.e. 3/4 of an inch is equal to 0.75 of an inch)

6. For the L measurement of 12 feet 6 inches (15.2 cm), take the 6 inches (15.2 cm) and divide it by 12.   6 inches (15.2 cm) / 12 = 0.50 feet (0.2 m).  Put the .50 after the 12. Now we have 12.5 feet (3.8 m).

7. At 15 feet (4.6 m) and 0 inches (0.0 cm) the W does not need to be converted. 

8. For the H measurement of 3 and 3/4 inches, we will first need to convert the fraction 3/4 of an inch to a decimal. Take the top number 3 and divide it by the bottom number 4. 

· 3 / 4 = 0.75 of an inch. Put the .75 after the 3. We now have 3.75 inches (9.5 cm). Now take 3.75 and divide that by 12.

· 3.75 / 12 = 0.31 feet (0.1 m).

o  Now we have L = 12.5 feet (3.8 m), W = 15 feet (4.6 m) and H = 0.31 feet (0.1 m).

9. Multiply them altogether. 12.5 x 15 x 0.31 = 58.25 cubic feet.

10. To calculate the Cubic Yards take the 58.25 cubic feet and divide it by 27. 58.25 / 27 = 2.15 Cubic Yards.