Are you measuring in yards, feet or inches?
If you convert all your measurements to yards first before multiplying, then your results would already be in cubic yards.
For example an volume of:
12 feet X 16 feet X 4 inches
Equals (converted to yards):
12/3 yards X 16/3 yards X 4/36 yards
4 yards X 5.333 yards X .1111 yards
I hope this helps!
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