Conversion Charts

Gravel or Sand Coverage/Ton

• 1" Depth - 220 S.F. - Approximately 1 Ton Material
• 2" Depth - 110 S.F. - Approximately 1 Ton Material
• 3" Depth - 73 S.F. - Approximately 1 Ton Material
• 6" Depth - 36 S.F. - Approximately 1 Ton Material
• 9" Depth - 22 S.F. - Approximately 1 Ton Material

Topsoil Coverage/Ton

• 1" Depth - 300 S.F. - Approximately 1 Ton Material
• 2" Depth - 200 S.F. - Approximately 1 Ton Material
• 3" Depth - 150 S.F. - Approximately 1 Ton Material
• 4" Depth - 100 S.F. - Approximately 1 Ton Material

Mulch or Humus Coverage/Cubic Yard

• 1" Depth - 324 S.F. - Approximately 1 Cubic Yard
• 2" Depth - 162 S.F. - Approximately 1 Cubic Yard
• 3" Depth - 108 S.F. - Approximately 1 Cubic Yard

Wallstone, Boulders and Flagging:

• Drywall Stone: 12 to 15 face feet per ton (1 ton will build a wall approximately 1" x 1" x 15")
• Boulders for retaining: 4.5 face feet per ton
• Boulders range 175 to 200 pounds per cubic foot (A rounded boulder 2" x 2"x 3" will weigh approximately 1 ton = approximately 10 pcs/truck load) To estimate the weight of an irregular boulder, multiply the 3 largest dimensions in feet.  (ex. 2"x 2"x 3" = 12 cubic feet)  Then deduct +/- 25% loss due to irregularity. (12 cubic feet x .75 = 9 cubic feet) Multiply this cubic footage by +/- 190 pounds/cubic feet to obtain the approximate weight of the boulder.  A truck load of boulders = approximately 10 ton (20,000 lb).
• Lava Rocks range 35 to 50 pounds per cubic foot
• Flagging 1" thick = about 13 pounds per square foot (approximately 150 square feet per ton)
• Flagging 1-1/2" thick = about 20 pounds per square foot (approximately 100 square feet +/- per ton)
• Belgian Block - 1 ton will cover approximately 40 square feet of paving

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