Gravel, mulch, sand, small rocks, and soil amendments can play a healthy and decorative role in your garden. Gravel, sand, and rocks are generally sold by weight. For coverage that's 2 inches (5 centimeters) deep, use the following amounts:

• 1 U.S. ton covers approximately 100 square feet.

• 1 metric ton covers approximately 10 square meters.

Soil amendments and mulch are generally sold by volume. For coverage that's 2 inches (5 centimeters) deep, use the following amounts:

• 1 cubic yard covers approximately 160 square feet.

• 1 cubic meter covers approximately 20 square meters.

Use the following table to convert U.S. and metric measurements. In each case, the conversions are approximately equal:

 1 centimeter ≈ 0.4 inches 1 inch ≈ 2.5 centimeters 1 meter ≈ 39 inches ≈ 1.1 yards 1 yard ≈ 0.9 meter 1 kilometer ≈ 0.6 mile 1 mile ≈ 1.6 kilometers 1 liter ≈ 1.1 quarts 1 quart ≈ 0.9 liter 1 kilogram ≈ 2.2 pounds 1 pound ≈ 0.4 kilograms 1 gram ≈ 0.04 ounce 1 ounce ≈ 31 grams