It depends on what size/kind of rock you want to use. Let's start with what I'll assume is the largest rock one would use in a rock garden - 3 to 5 in. River Rock: 1 Ton will cover about 80 sq. ft. if you want to make sure there are no "holes" 1 to 3 in. River Rock: 1 Ton will cover about 100 sq. ft. (no holes) 3/4 in. Rock: 1 Ton will cover about 150 sq. feet at 1.5" deep... & 120 sq. ft. at 2" deep 3/8 in. Rock - or crusher finds cover about the same as 3/4 in. Rock, but when using smaller rock, I like to cover at least 2" deep because there's more of a tendency for smaller rock to move around & settle, and you want to make sure you aren't looking at the weed barrier in half a year.
250
It depends on what kind of rock it is.
How many square feet will a ton of salt cover?
1 cubic yard of crushed rock fills 3/depth in feet square yards.
Tiles that are two feet on a side cover 4 square feet. 378 of them cover 1512 square feet.
A bundle of Shingles will cover roughly 33 square feet. A square of Shingles (3 Bundles) will cover 100 square feet.
9 square feet.
240
it will cover 3 cubic feet, or 9 feet, I am not sure how many square feet
190
400 Square Feet.
1,440 square feet or 160 square yards.