Fire Glass Calculator: How Much Fire Glass Do You Need?

Your details

Choose the shape that matches your burner opening.
Glass type affects bulk density and therefore total weight needed.
Inner diameter of the round burner tray or fire bowl opening. Ignored for rectangular and fireplace shapes.
in
How deep you want the glass to sit. 1.5-3 inches is standard for fire pits; 1-2 inches for fireplaces and bowls.
in
Leave at 0 to skip cost calculation. Enter your local price per pound or kilogram.
$/lb
Fire glass neededMedium fill
31.4lb

Total weight of fire glass required

Fire glass needed14.3kg
Burner area314.2in²
Glass volume628.3in³

You need about 31.4 lb of fire glass.

  • You will need approximately 31.4 lb of fire glass to fill your round to that depth.
  • Your glass depth is within the recommended range. The burner will be covered safely without restricting gas flow.
  • Order 10-15% extra to account for settling, color blending, and future top-ups.

Next stepMeasure the inner dimensions of your burner tray, not the outer frame, and round up to the nearest whole bag when ordering.

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