Glass Calculator

Important!: Any fireglass on the market can be used ONLY in devices designed by the manufacturer for use with fireglass. (And if it can be used, you need to respect the recommended size and amount of fireglass). Please seek professional help with installation, especially if using propane gas as it can be very dangerous if not properly installed.

Note: 7.5 lbs of glass gives you a 1 inch layer covering 1 sq.ft., or use the calculations below.

For rectangular or trapezoidal fireplace/fire pit:
1) Measure the width across the center (side to side) of the firebox (in inches), or length of the fire pit.
2) Multiply the result times the depth (inches) from the front to the back, or the width of the fire pit.
3) Divide the result by 20.
4) Multiply the result by the number of inches high you would like the glass. For natural gas, you need 2 inches above the burner; for propane, the glass should not cover the gas orifices (see above).
5) The result is the number of pounds needed (approximately).

For round fire pits:
1) Divide the diameter (in inches) by 2.
2) Square the result.
3) Multiply the result by 0.15.
4) Multiply the result by the number of inches deep. For natural gas, you need 2 inches above the burner; for propane, the glass should not cover the gas orifices (see above).
5) The result is the number of pounds needed (approximately).