4 ft x 80 ft = 320 feet squared.
That's an area, like square feet of weed cloth, it's flat.
You need height to have volume!
4ft * 80ft * __ ft high = ___ feet cubed <<< that's volume
1 ft¹ is length, but we write this as simply 1 ft
1 ft² is area
1 ft³ is volume.
The way I like to convert to yards is to convert each measurement
Let's say we had 4ft x 80ft x 2 ft high
To convert, multiply each by (1) as (1yd/3feet)
4ft (1yd/3ft) x 80ft (1yd/3ft) x 2ft (1yd/3ft) = ___ yd³
in this example we have 24 yd³
If you only have a few inches, you need to convert it to feet first.
e.g. 2 inches
2 inches (1 ft/12in) = 0.166666666666667 ft
then you'd have
4ft (1yd/3ft) x 80ft (1yd/3ft) x 0.166666666666667 ft (1yd/3ft) = ___ yd³
So determine the depth of soil, then use the technique here.
Let the units help work the problem! Jim
You ALWAYS multiply by (1) to do conversions!!!