Fire Glass Calculator

Need to find how much fire glass you need for your fire pit or fireplace? Our fire glass calculator can help you with that. Try it now!

Volume to order2.4691 cubic yards66.667 cu ft · 1.8878 m³

Weight3.1214 US tons2,831.7 kg · 6,242.8 lb · 2.8317 tonnes

MaterialFire glass1,500 kg/m³, about 94 lb/ft³

Cubic feet66.667

Cubic metres1.8878

In 50 lb bags125if buying bagged rather than bulk

Area covered200 sq ft18.5806 m²

Depth4 in101.6 mm

One cubic yard covers81 sq ftat 4 in deep

The method

volume = area × depth; weight = volume × density

Depth in inches, volume in yards

This is where the arithmetic usually goes wrong. A cubic yard is 27 cubic feet, so spread 4 inches deep it covers 81 square feet — not 27. Divide the depth in inches by 12 before multiplying, or work in a single unit throughout.

Order by volume when you can and treat the weight as a cross-check. Loose densities vary by about 10% between quarries and rise sharply when the material is wet, so a ton of gravel is a less definite quantity than a cubic yard of it.

Add a compaction allowance for anything that will be rolled or tamped. Crusher run and road base typically lose 20–25% of their loose volume once compacted.