Fire Glass Calculator

in
in
in
Typical: 2–3 inches above burner.
Construction

Calculate how many pounds of fire glass media are needed to fill a fire pit or fireplace burner tray.

Formula

Pounds = length × width × depth (cu in) × 0.0347 lbs/cu in
  • Fire glass density ≈ 60 lbs/cu ft (0.0347 lbs/cu in).
  • Add 10–15% extra for settling.
  • Typical fill depth: 2 inches; 3 inches for a fuller look.

36×12 in burner, 3 in deep

Inputs
  • Burner/Pit Length: 36 in
  • Burner/Pit Width: 12 in
  • Glass Fill Depth: 3 in

36×12×3 = 1,296 cu in × 0.0347 = 44.97 lbs → 45 lbs.

Frequently asked questions

How deep should fire glass be?
At least 1 inch over the burner top; 2–3 inches gives the best visual effect.