 # Formulas

### General Formulas

• There are 2000 pounds in a ton
• For most bulk materials, number of yards x 1.5 = number of tons
• Area of a square or rectangle = width x length
• Area of a circle = 3.14 x radius squared
• Circumference of a circle = 3.14 x diameter
• Volume of a cube = width x length x height
• Volume of a tube = 3.14 x radius squared x height
• There are 27 cubic feet in a cubic yard
• Most boulders weigh about 170 lbs per cubic foot

### Coverage

• 1 Gallon of Plasterweld or Weldcrete Willver
Approx. 200 SQ FT
• 1 Yard of Most Bulk Materials Will Cover
320 SQ FT @ 1 inch thick
160 SQ FT @ 2 inch thick
120 SQ FT @ 3 inch thick
80 SQ FT @ 4 inch thick
• 1 Ton of Flagstone Will Cover
Approx. 120 SQ FT @ 1 ¼ inch thick
Approx. 100 SQ FT @ 1 ½ inch thick
Approx 75 SQ FT @ 2 inch thick
• 1 Ton Of Most Wallrock Will Cover Approx. 35 SQ FT
• Square Foot per Piece of Cut Stone
Length x Width (in inches) divided by 144 = SQ FT per piece

### Formula for Mortar

• 3 Parts Sand
• 1 Part Common Cement
• ½ Part Lime