To put out a grease fire, turn off the burner, then slide a metal lid or baking sheet over the pan to cut off oxygen. Never use water. That single mistake turns a manageable stovetop fire into an explosive fireball in less than a second. If the fire has already spread beyond the pan, leave your home, close the kitchen door behind you, and call 911 from outside.
Step by Step: Putting Out a Pan Fire
The moment you see flames rising from a pan of oil, act in this order:
- Turn off the heat. This removes the energy source that keeps pushing the oil toward higher temperatures. Don’t move the pan, because sloshing burning oil creates a much bigger problem.
- Cover the pan. Slide a metal lid, a baking sheet, or a cookie tray over the top. Approach from the side rather than reaching over the flames. The lid starves the fire of oxygen, and flames should die within seconds.
- Leave the lid on. The oil underneath is still hot enough to reignite if air reaches it again. Let the pan cool completely, at least 15 to 20 minutes, before you uncover it or try to move it.
If you don’t have a lid nearby, you can carefully pour a large amount of baking soda directly onto a small grease fire. Baking soda releases carbon dioxide when heated, which helps smother flames. The key word is “large amount.” A light sprinkle won’t do anything useful, and this only works when the fire is still confined to the pan.
Why Water Makes a Grease Fire Explode
Cooking oil burns at temperatures well above 400°F. Water is denser than oil, so when you pour water into a pan of burning grease, the water sinks below the oil’s surface before it boils. In that fraction of a second, the water flash-converts to steam and expands to roughly 1,700 times its liquid volume. That violent expansion launches the burning oil into the air, atomizing it into a fine mist of tiny droplets mixed with oxygen.
The result is essentially a fuel-air explosion above your stove. Those microscopic oil droplets have enormous combined surface area, so they ignite almost instantly and create a fireball that can reach the ceiling and spread to cabinets, curtains, and clothing. A single cup of water thrown on a grease fire can engulf an entire kitchen. This is the most dangerous mistake you can make.
What Else You Should Never Use
Flour is combustible. Throwing flour on a grease fire can cause it to ignite in midair, creating a flash fire above the pan. Sugar behaves similarly. Baking powder, while it looks like baking soda, contains additional ingredients that can react unpredictably with burning oil. A wet towel might seem logical, but it can catch fire or drip water into the oil. The American Red Cross specifically warns against all of these.
Stick with baking soda (sodium bicarbonate only), salt in very large quantities, or a lid. When in doubt, covering the pan is simpler and more reliable than throwing anything into it.
Choosing the Right Fire Extinguisher
The standard ABC fire extinguisher found in most homes will technically put out a grease fire, but it sprays a fine dry chemical powder that coats every surface in your kitchen. In a commercial kitchen, using one can force a days-long shutdown and equipment replacement. For home kitchens, a Class K extinguisher is a better choice. It uses a wet chemical agent that reacts with burning cooking oil through a process called saponification, essentially converting the oil into a non-flammable soap. The resulting foam sits on top of the oil, sealing it from oxygen and preventing reignition.
Class K extinguishers are also food-safe and easy to clean up afterward. You can wash the residue away with water, unlike dry chemical powder, which is sticky and corrosive to appliances. A small Class K extinguisher designed for residential kitchens typically costs $40 to $60 and mounts on a wall near (but not directly above) your stove.
If you use any extinguisher, aim at the base of the flames from several feet back, not directly into the pan from above. Blasting straight down into hot oil can splash it out of the pan.
When to Stop Fighting and Get Out
A grease fire that stays inside the pan is manageable. A grease fire that has spread to cabinets, a backsplash, or anything else in your kitchen is not. The National Fire Protection Association’s guidance is straightforward: if the fire doesn’t go out with a lid or you don’t feel comfortable attempting it, get everyone out of the house. Close the kitchen door behind you to slow the fire’s spread, and call 911 from outside.
Grease fires escalate faster than almost any other household fire. Cooking oil autoignites between roughly 760°F and 815°F depending on the type. Once the oil in a pan reaches those temperatures, it doesn’t need a spark or flame to burn. It simply ignites on contact with air. That means even if you briefly knock down the flames, oil that’s still superheated can reignite the moment it’s exposed to oxygen again. This is why leaving the lid in place until the pan fully cools matters so much.
Preventing Grease Fires Before They Start
Most grease fires happen because oil was left heating unattended or because the burner was set too high. A few habits dramatically lower your risk:
- Use a thermometer. A clip-on deep-fry thermometer lets you see when oil is approaching dangerous temperatures. Most frying happens between 325°F and 375°F. If your oil starts smoking, it’s already past its smoke point and heading toward its flash point.
- Stay in the kitchen. Cooking is the leading cause of home fires in the United States, and unattended cooking is the leading factor. If you need to leave the room, turn off the burner.
- Keep a lid within reach. Before you heat oil, place a fitting metal lid or baking sheet on the counter next to the stove. In an emergency, you won’t have time to dig through a cabinet.
- Don’t overfill the pan. Oil expands as it heats. Filling a pot more than one-third full increases the chance of oil spilling over the rim onto the burner flame or heating element.
Dry your food before it goes into hot oil, too. Moisture on the surface of frozen or freshly washed food causes violent splattering, which can push oil onto an open flame and start a fire before the oil in the pan itself reaches a dangerous temperature.