Gas Log Sizing Guide
Gas log sizing starts with the firebox, not the log set. A good set must sit inside the opening with safe space around the burner, grate, flames, and controls. The smallest width, usually the back width, controls the fit. Depth matters too, because many burners need room at the front and rear.
Measure Before Choosing
Use a tape measure on the inside opening. Measure the front width, back width, height, and depth. Keep the tape level. Write each value in inches. Do not guess from the old grate. Old parts may be bent, oversized, or unsafe for a new burner.
Clearance and Fit
The calculator subtracts side, rear, and front clearances. This creates a usable area. The selected fill style then controls how much of that area should be covered by logs. A compact style leaves more visible space. A full style gives a wider look, but it needs better clearance.
Heat Planning
The tool also estimates room heat demand. It uses room volume and a selected heat goal. Decorative use needs less output. Strong heating needs more output. The calculator compares room demand with an estimated burner input. This helps you avoid a set that looks right but heats poorly.
Fuel Use
Fuel use is estimated from the input rating. Natural gas is shown in cubic feet per hour. Propane is shown in gallons and pounds per hour. These values help compare running cost, tank needs, and supply capacity.
Safety Review
This calculator is not a final installation approval. Gas appliances need correct venting, pressure, pipe sizing, combustion air, and approved fittings. Vent-free products may have extra room volume limits. Vented products need a suitable chimney or flue. Always follow the appliance manual and local rules. Hire a qualified gas technician when connecting fuel lines, testing leaks, or changing appliance parts.