Moving to an induction range usually triggers a kitchen audit. Some pans will work. Some will not. Some will technically work but perform badly enough that you will end up replacing them anyway. The label on the box is not always reliable. Pans marked “induction-ready” sometimes fail real-world testing, and pans with no marketing whatsoever sometimes work better than premium options.
The good news: there is a single test that takes 60 seconds and gives a definitive answer for any pan in your kitchen. This guide walks through the test, explains the physics behind why it works, and covers the failure cases that come up with otherwise high-quality cookware.
The magnet test, step by step
You need one tool: a refrigerator magnet, a magnetic clip, or any other small kitchen magnet. The strength of a standard fridge magnet is sufficient. You do not need anything stronger.
- Pull the pan you want to test out of the cabinet. Make sure it is clean and at room temperature.
- Flip the pan upside down so you can see the bottom (the cooking surface).
- Place the magnet flat against the center of the pan bottom.
- Try to slide the magnet sideways without lifting it.
- Lift the pan by the magnet alone. If the pan rises off the counter, it will work on induction.
That is the test. Three outcomes:
The magnet sticks firmly and the pan lifts: the pan is highly ferromagnetic and will work well on induction. Heat transfer will be efficient, response will be fast, and the pan will reach high temperatures quickly.
The magnet sticks weakly or slides easily: the pan has some magnetic material but not enough for efficient induction cooking. It might work in a pinch but will heat slowly and unevenly. Most “stainless steel” pans with thin magnetic plates fall into this category.
The magnet does not stick at all: the pan will not work on induction. Period. No workaround beyond an interface disk.
Why the test works
Induction cooktops do not produce heat the way gas or electric burners do. They produce a rapidly alternating magnetic field. When you place a ferromagnetic pan over the field, the field induces small electrical currents (called eddy currents) inside the metal of the pan itself. These currents flow through the pan’s electrical resistance, which generates heat directly in the pan.
For this to work, the pan must contain enough iron (or another ferromagnetic material like certain stainless steels) for the magnetic field to grip. The magnet test is a direct check of whether the pan has that magnetic gripping property. If a magnet can hold the pan up against gravity, the induction field has plenty to grip onto.
Materials that always work
These materials are reliably induction-compatible:
- Cast iron. Bare cast iron skillets (Lodge, Stargazer, Field, Smithey) and enameled cast iron (Le Creuset, Staub, Lodge enameled). Iron content is high enough that magnetic transfer is excellent.
- Carbon steel. De Buyer, Matfer Bourgeat, Mauviel M’Steel, Lodge carbon steel. Same magnetic properties as cast iron with less weight.
- Magnetic stainless steel. Pans marked 18/0 or 400-series stainless. These are nickel-free stainless alloys that retain magnetism. Often used as cladding layers on the base of multi-clad cookware.
Materials that never work
These will not work on induction, no matter the brand or quality:
- Pure copper. Mauviel copper, Falk copper, vintage copper saucepans. The copper itself is non-magnetic. Only the rare copper pans with steel discs added to the base will work.
- Pure aluminum. Most professional aluminum pans, vintage Magnalite, lightweight stockpots. Aluminum is non-magnetic and non-induction-compatible.
- Non-magnetic stainless steel. Pans marked 18/10 or 18/8 with no separate magnetic base. Even though the marketing says “stainless steel,” the high nickel content makes these alloys non-magnetic.
- Glass cookware. Pyrex, Visions, any glass or Pyroceram. Not magnetic at all.
- Ceramic cookware. Visions, Corningware, glazed clay. Not magnetic.
The “induction-ready” trap
Many pans sold today carry an “induction-compatible” or “induction-ready” label without actually performing well on induction. The most common culprit is a budget pan made primarily of aluminum with a thin disk of magnetic stainless welded to the bottom. The label is technically accurate (it works on induction) but performance is poor.
What goes wrong:
- The magnetic disk covers only the center 4 to 5 inches of an 8 to 10 inch pan, leaving the outer ring cold. Eggs at the edge of the pan stay raw while the center burns.
- The disk separates from the pan over time, creating a hot spot or a buzzing sound during cooking.
- The thin magnetic layer reaches its saturation point at moderate power, so cranking the burner up does not increase actual heat in the pan.
The magnet test catches some of this. A well-built induction-compatible pan will hold a magnet firmly across the entire base, not just the center. If you can only stick the magnet to a small spot in the middle, the pan will heat unevenly.
What to do with non-compatible cookware
Three options when you find favorite pans that fail the test:
- Replace. The cleanest answer. Cast iron, carbon steel, and proper multi-clad stainless cookware are widely available at most price points. A Lodge 12 inch cast iron skillet costs $30 and will outlast most other pans in the kitchen.
- Interface disk. A flat steel plate (also called a converter plate) sits between the burner and the pan. The plate absorbs the induction field and conducts heat into the pan above. This works but loses much of the speed and responsiveness advantage. Useful for an irreplaceable enameled copper saucepan, less so for daily cooking.
- Keep for non-induction use. Many cooks keep a few non-compatible pans for the oven, the gas grill, the camp stove, or a future move. Aluminum sheet pans and pure copper saucepans can sit on the shelf without taking up induction time.
When the magnet sticks but the pan still performs badly
The magnet test is necessary but not sufficient. A pan can be ferromagnetic and still cook badly on induction if:
- The bottom is warped or convex. Induction burners need flat contact across most of the cooking zone. A warped pan will buzz, click, or alarm out the burner.
- The pan is undersized for the burner zone. Most induction burners require a pan at least 4 to 5 inches in diameter to register. Smaller pans will not activate the burner at all.
- The pan is too thin. Lightweight pans heat fast but lose temperature stability. Look for cookware with at least 2.5 to 3 mm of base thickness.
The full induction cookware story is a combination of magnetic compatibility, flatness, base thickness, and size. The magnet test catches the first criterion. The rest you check by eye and feel. See our methodology page for the full cookware testing protocol.
Frequently asked questions
How do I test if a pan works on induction?+
Stick a kitchen magnet to the bottom of the pan. If the magnet holds firmly so you can lift the pan by the magnet, the pan will work on induction. If the magnet falls off or barely sticks, the pan will not work or will perform poorly. Test the actual cooking surface, not the sides.
Why does my pan say 'induction-ready' but barely heat up?+
Two reasons. First, the magnetic layer on the bottom is too thin (often only a thin disk welded to the base of an aluminum pan). Second, the pan bottom is warped or non-flat, so most of the surface area is not in contact with the burner. Induction needs both magnetic material and a flat bottom to transfer energy efficiently.
Will cast iron work on induction?+
Yes, every cast iron pan works on induction. Both bare cast iron and enameled cast iron contain enough iron to transfer energy efficiently. The only caveat is weight: a 12 inch cast iron skillet weighs 8 to 10 pounds and most induction burners have a 25 pound weight limit per zone, so it is fine.
Why doesn't my copper or aluminum pan work?+
Induction works by inducing a magnetic field in the pan that converts to heat through electrical resistance. Pure copper and aluminum are non-magnetic and have very low electrical resistance, so they cannot generate the heat needed. They are physically incapable of working on induction, regardless of price or quality.
Can I use an interface disk to make non-compatible cookware work?+
Yes, but with significant tradeoffs. An induction interface disk is a steel plate that sits between the burner and the pan. It absorbs the magnetic field and conducts heat upward. This works for occasional use but loses 30 to 40 percent of induction's speed advantage and can scratch the cooktop. Better to replace the pan.
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Priya Sharma
Priya Sharma writes for The Tested Hub.