How much gravel for 50 square feet?

At 3 inches deep, 50 square feet needs 0.46 cubic yards of gravel, or about 25 bags (0.5 cu ft (50 lb) each).

Crushed stone weighs about 1.4 tons per cubic yard; it varies by stone type.

Depth	Cubic yards	0.5 cu ft (50 lb) bags	Tons
2 in	0.31	17	0.43
3 in	0.46	25	0.65
4 in	0.62	34	0.86

1 cubic yard = 27 cubic feet. Bulk delivery is usually cheaper than bags above about 1 to 2 cubic yards.

Calculate your own