Induction cookware is any pot or pan with a ferromagnetic base that heats directly on an induction cooktop through electromagnetic induction.
That only works if the cookware contains enough magnetic material to couple with that field. If you’re shopping for a set that works on your induction stove, knowing what makes a pan compatible is the difference between dinner and a frustrating cold pan.
The Core Rule: It Must Be Magnetic
A pan works on an induction cooktop only when its base is ferromagnetic. That means the metal contains iron and can be magnetized strongly enough to respond to the cooktop’s field. The standard quick check is the magnet test—if a refrigerator magnet sticks firmly to the flat bottom of the pan, it will almost certainly work on induction.
Materials that pass the test include:
- Cast iron, including enameled cast iron
- Magnetic stainless steel (most 400-series grades)
- Carbon steel and most steel cookware
Materials that fail it include pure aluminum, copper, glass, ceramic, and most non-magnetic stainless steel (like 300-series grades). These don’t work on induction unless a manufacturer bonds a magnetic stainless steel or iron base layer to the bottom of the pan.
Many pans also carry a label. Look for an induction symbol (four horizontal loops above a line) or wording that says “induction compatible.” But note that the absence of a label does not automatically mean the pan won’t work—the magnet test remains the most reliable check.
Why Size and Fit Matter on an Induction Hob
Induction zones are precise, and the pan must cover the active cooking area completely to heat evenly. A small pan on a large zone will leave part of the field unutilized, and a pan that overhangs a small zone heats unevenly. Consumer safety guidance from the German Federal Office for Radiation Protection notes that the cookware should fit the cooking zone properly so the energy transfers where it should.
Beyond fit, the pan’s base should be flat. Warped or rounded bottoms reduce contact and can cause hotspots or a rattling pan as the field pulses.
What About the Electromagnetic Field?
Induction cooktops generate a low-frequency electromagnetic field while they operate. The field diminishes rapidly with distance, so maintaining that gap while cooking is the practical takeaway.
For most home cooks, the bigger day-to-day concern is glass surface care. Because the cooktop itself doesn’t get hot, spills don’t burn on the same way they do on radiant coils—but the pan’s base heats everything it touches, so a dirty pan bottom can leave marks.
If you’re ready to upgrade your current set, our tested roundup of the best cookware sets for induction cooktops covers the models that pass the magnet test and perform well.
Yes, Your Old Pans Might Work
Before you buy anything new, test what you already own. Cast iron skillets, enameled Dutch ovens, and many stainless steel pots with a magnetic base layer will work fine. If the magnet barely clings or slides off, that pan won’t heat on induction—no amount of preheating will fix that.
One honest caveat: even magnetic pans vary in performance. A thin stainless steel pan with a weak magnetic layer may heat unevenly, while a thick cast iron skillet holds heat beautifully. The quality of the base matters as much as its presence.
FAQs
Can I use glass cookware on an induction cooktop?
No. Glass is not ferromagnetic, so it will not heat on an induction cooktop. The same applies to pure aluminum and copper cookware. Some manufacturers add a magnetic stainless steel or iron plate to the base of these materials, which makes them compatible—check for that layer or run the magnet test on the bottom.
Do all stainless steel pans work on induction?
Not all of them. Stainless steel must contain enough ferromagnetic iron in its alloy to respond to the induction field. Most 400-series stainless steel passes the magnet test, but many 300-series grades (like the common 18/10) are non-magnetic and won’t work unless a magnetic base layer is added.
Does a magnet test always guarantee a pan will work?
Almost always, but not always perfectly. A firm magnet stick on the flat bottom is a strong sign of compatibility. A weak or partial stick might mean the magnetic layer is thin, which can lead to slow or uneven heating. The magnet test is the best quick check, but it doesn’t guarantee even performance.
References & Sources
- Swiss Federal Office of Public Health. “Fact Sheet: Induction Hob.” Explains field exposure and the 5–10 cm distance guidance.