Lava Rocks for a Fireplace

`Wt = 1/2 * D*(F+B) * Dp*(22" lb/ft"^3)`

Enter a value for all fields

The Lava Rocks for a Fireplace calculator computes the pounds and number of bags of lava rocks needed for a fireplace.

INSTRUCTIONS: Choose units and enter the following:

(F) Front of Fireplace
(B) Back of Fireplace
(D) Depth of Fireplace
(Dp) Depth of glass in Fire Pit

Lava Rocks for Fireplace (Wt): The calculator returns the weight of the lava rocks needed in pounds and the approximate number of 5, 6, 10 pound and 12 pound containers (cartons, pails or bags).

The Math / Science

Propane and nature gas fireplaces provide warmth and atmosphere to your home or yard. Your gas fireplace needs to diffuse the gas on the fire pit surface through an attractive BUT non-combustible material like lava rocks or glass. The approximate density of spread lava rocks is 22 pounds per cubic foot, but this can vary based on the spreading (loose vs. tight) and the size of the rocks. The basic shape of a fireplace floor is a trapezoid, two parallel sides and angled ends.

The Stone or Glass for a fireplace calculator computes the number of bags of lava rocks or exotic glass needed for a fireplace based on the dimensions of the fireplace and depth of material (glass or lava rocks).

The Math / Science

Fireplace and Fire Pit Calculators

Fire Glass Calculators

Lava Rock Calculators