Fireplace
Measure the front width, the width at the back. Add together and divide by 2. Multiply that number by the depth (front to back) to get the total square inches. Divide that number by 16 to get the number of pounds.
Example: Front width is 36", back width is 30" and the depth is 20". 36" + 30" divided by 2 = 33". 33" x 20" = 660" divided by 16 = 41 pounds Rectangle Fire Pit
Measure the width (left and right) and the depth (front to back). Multiply those two numbers to get the total square inches. Divide that number by 16 to get the number of pounds.
Example: Width is 36" & the depth is 24". 36" x 24" = 864" divided by 16 = 54 pounds |
Round Fire Pit
Determine the diameter (the length across the opening at the widest part)
Half of the diameter is the radius Multiply radius x radius x 3.14 to get the square inches Divide the square inches by 16 = number of pounds you need Example: Diameter is 24", Radius is 12" 12 x 12 x 3.14 = 452 square inches divided by 16 = 28 lbs Square Fire Pit
Just like the rectangle, measure the width (left and right) and the depth (front to back). Multiply those two numbers to get the total square inches. Divide that number by 16 to get the number of pounds.
Example: Width is 24" & the depth is 24". 24" x 24" = 576" divided by 16 = 36 pounds |