0.178 is a constant that converts cubic feet into Bbls.

5.6145833 equals the cubic feet in 1 Bbl (231 **in ^{3}/gal** x 42

**gal/bbl**) ÷ 1,728

**in**

^{3}/ft1 ÷ 5.6145833** =** 0.178

divide by 12 to get Bbls/in = 0.0148333

Total Volume_{Bbls} Rectangular Tank = (Length_{Ft} x Width_{Ft} x Height_{Ft}) x 0.178