This fire glass calculator, also known as a fire pit glass calculator, can help you figure out how much fire glass you’ll need for a beautiful fire pit. Using this tool, quickly and simply determine the volume and weight of your required fire glass. You’ll discover what fire glass is, how it works, and how to determine how much glass you’ll need with this calculator. If you need help, continue reading to begin learning.

While you are here, check out some other products we have developed, such as Plate Weight Calculator or maybe something else from construction category, but see our physics section as well.

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Fire Glass – What is and what do we use it for?

Also, fire glass is a decorative bead material that may be used to fill your fire pit as a substitute or supplement to existing fire pit media such as lava rocks, ceramic log sets, or ceramic river rocks.

Fire Glass Formula

Formula for calculating the fire glass is given bellow:

Volume=Area\times Depth

Area is calculated multiplying width and length of the fireplace.

Fire Glass – Different Types

As we all know, fire glass is a sort of decorative glass used to enhance the appearance of outdoor gas fires and fireplaces. Some of the varieties available are:

  • Tempered refractory glass
  • Crushed refractory glass
  • Diamond fire glass
  • Fire beads

Fire Glass Calculator – How to Use?

Our fire pit glass calculator is simple to use and understand. The instructions for utilizing our calculator are as follows:

  1. The first step is to decide on the sort of fire glass you want and to buy recyclable or reflecting fire glass. This will give you the density of your option for weight calculations.
  2. After that, decide on the form of your fire pit or fireplace.
  3. Use our fire glass calculator to enter the measurements of your fire pit.

Practical Example

Let’s imagine we want to use recycled fire glass (density = 1.445 g/cm3 ) to completely fill a 60 cm square fire pit centerpiece that is 7.5 cm deep. Because the area of a square can be calculated by multiplying its side measurements by themselves, the area of a square is 60 cm x 60 cm = 3,600 cm2. The volume of fire glass may then be calculated using our equation:

Volume=Area\times Depth = 3600 \; cm^2 \times 7.5 \; cm = 27000  \; cm^3

Finally, as indicated below, we can calculate how much glass we’ll need in terms of weight:

Weight = Volume \times Density \newline= 27000 \; cm³ \times 1.445 \;g/cm³ = 39015 \;g ≈ 39.0 \;kg

We’ll need roughly 39 kg of reclaimed fire glass to fill our fire pit based on our calculations. Because fire glass costs about $10 per kilogram, we may have to fill the fire pit with lava rocks for the first 5.0 cm and then fire glass for the last 2.5 cm. This will leave us with only a third of the initial quantity we require, lowering both the quantity and the cost.

Regardless, how much fire glass is an investment, it pays off in the long run.


What is fire glass?

Fire glass is designed to endure severe temperatures, cracking, and color change when used with the correct gas. Natural gas is the best gas to use with a fire glass pit. You can still use propane as a heat source but be warned that propane may cause discoloration and breaking of the fire glass.

How Much Fire Glass Do I Need?

We recommend covering the fire pit burner with 2′′-3′′ of glass in a natural gas fire pit or fireplace. We recommend covering the burner with no more than 1 inch of glass in a gas fire pit or fireplace.

Can you use glass rocks in a fire pit?

Under the fire glass, DO NOT use lava rock, lava pebbles, rocks/pebbles, or any other porous substance. Following the same guidelines for creating a propane fire pit as natural gas, we HIGHLY recommend employing a pan burner system to keep the propane from sinking to the bottom of the pit.

Is lava rock or fire glass better?

To begin with, both fire glass and lava rock are excellent heat conductors. But, overall, the choice between fire glass and lava rock is a personal one. The fire glass’s reflectivity, on the other hand, allows it to absorb more heat and hence produce more high temperatures.

Should fire glass cover the burner?

Yes, it would be best if you covered top of the burner with fire glass. But only to the point that it isn’t visible.
Because propane is heavier than air and must be disseminated near to the flame.