Outdoor
Fire Glass Calculator
Calculate the pounds of fire glass your fire pit or fireplace needs, by shape and fill depth.
Fire Glass Calculator
Pick your fire feature shape, measure the dimensions shown, and we'll calculate the fire glass needed.
Round Pit
4-Sided Pit
Fireplace
Round Fire Pit
(A) Diameter(B) Glass Depth (~2″–4″)
4-Sided Fire Pit
(A) Width(B) Length(C) Glass Depth (~2″–4″)
Fireplace
(A) Front Width(B) Back Width(C) Fireplace Depth(D) Glass Depth (~2″–4″)
0
Pounds Needed
0
Bags
Density: ~100 lb/cu ft tempered fire glass. Add ~10% overage for spread.
How it works
Three steps to your estimate
01
Pick your shape
Round pit, four-sided pit, or fireplace, then measure the dimensions shown on the diagram.
02
Set the fill depth
A 2 to 4 inch layer is typical; a top-off layer adds a heaped look.
03
Read your pounds
The calculator returns total pounds and the number of bags needed.
Common Questions
Fire Glass Calculator FAQ
How much fire glass do I need?+
Enter your pit shape, size, and fill depth, and the calculator estimates the pounds you need at about 100 pounds per cubic foot for tempered fire glass. Adjust the depth to fine-tune the total.
How deep should the fire glass be?+
A 2 to 4 inch layer covers the burner and looks full, and you can add a thin top-off layer for a heaped finish. Set your depth in the calculator to match.
Is fire glass safe for my fire feature?+
Tempered fire glass is made for gas fire pits and fireplaces. Always follow your burner manufacturer guidance for safe use.
Should I order extra?+
Add about 10 percent extra to allow for spread and a fuller surface. A little overage keeps the bed looking full over time.