How much propane does a griddle use?

A griddle running flat out burns its total BTU rating, divided by 91,452, in gallons of propane per hour. A Blackstone 36 at 60,000 BTU is about 0.66 gal/hr — roughly an hour and a half per gallon. A Blackstone 17 at 12,500 BTU is about 0.14 gal/hr, or over seven hours per gallon. The 91,452 figure is the U.S. Energy Information Administration’s energy content for a gallon of propane, and it is the only number you need that is not already on your griddle’s spec sheet.

The arithmetic

A burner’s BTU rating is a rate: BTU per hour at full output. Propane carries 91,452 BTU per gallon. Divide one by the other and you have gallons per hour:

gallons per hour = total BTU ÷ 91,452

Invert it for run time: hours per gallon = 91,452 ÷ total BTU. Then multiply by whatever your cylinder actually holds — read that off the cylinder, since sizes and fill levels vary — and you have your real run time.

Every griddle here, at full output

Every figure above is computed from the griddle’s published total output, which is sourced and linked on each product card. Nothing here is measured by us and nothing is estimated.

Why your real consumption is lower — usually by half

The table above is the worst case: every burner wide open for a full hour. Nobody cooks that way.

A realistic session is ten to twenty minutes of preheat with everything on high, then cooking with one or two zones turned down or off. If you average roughly half of total output across the cook — which is generous for most cooking — double the hours-per-gallon column. A Blackstone 28 at half output runs over five hours per gallon.

This is the practical reason burner count matters as much as it does. Four zones is not just control, it is the ability to not heat three quarters of a plate you are not using — the burner-count guide covers the rest. On a single-burner 17″, every cook heats the whole surface whether you need it or not.

Three things that waste propane

Fuel use is not fixed. Three variables move it meaningfully, and two of them have products attached.

• Wind. This is the big one. Wind strips heat off an exposed plate faster than the burners replace it, so you compensate by running higher settings for longer. A three-sided wind guard matched to the griddle’s width also stops low-setting burners blowing out — what to look for.
• Cooking with the lid up when it could be down. A hinged hood traps heat, which means melting, reheating and roasting at a lower burner setting. A hood rather than a hard cover is the version of this that pays for itself.
• Running hotter than you need. Most people cook at a higher setting than the food wants, because a knob position is not a temperature. An infrared surface thermometer turns “three quarters” into a number, and the temperature chart tells you what number you actually wanted.

Cold weather also reduces the vapor pressure in the cylinder, so a near-empty tank on a cold morning delivers less than a full one. That is a supply problem rather than a consumption one, but it looks identical from the cook’s side — see why a griddle will not reach temperature.

If you cook often, consider natural gas

A griddle you use weekly goes through cylinders, and the exchange cost of propane is the most-ignored running cost of owning one. Several models can be converted to run on a household natural-gas line instead, which removes the cylinder entirely.

It is not a universal option and it is not a casual modification — what conversion involves, and which griddles support it. Never improvise a conversion or modify a regulator: use the manufacturer’s kit for your exact model, or have it done.