50 cubic feet of gravel is about the size of a pickup truck bed, heaped. When poured into a loose pile, it measures 7.88 ft wide and 3.08 ft tall.

Volume
1.85 cubic yards
1.85 yd³ (1.42 m³)
about the size of a pickup truck bed, heaped
Gravel typically ranges 1.6–1.9 g/mL depending on how it's packed. A firmly packed scoop weighs more.