Microwave Longevity: How Long Do Microwaves Last and When to Repair or Replace

When you think about microwave longevity, how long a microwave typically functions before it stops working reliably. Also known as microwave lifespan, it’s not just about how many years it’s been sitting on your counter—it’s about how well it’s been treated, what parts wear out, and whether fixing it makes financial sense. Most microwaves last between 7 and 10 years, but that’s just an average. Some die after 5 years from heavy use or poor ventilation. Others keep going past 12 years with simple care like cleaning spills right away and not running them empty.

The real question isn’t just how long it lasts—it’s why it stops working. The magnetron, which generates the microwaves, is the heart of the unit and usually fails after years of use. The turntable motor, door switches, and control panel are also common trouble spots. A broken door latch might seem minor, but it’s a safety issue. And if your microwave heats unevenly or makes loud buzzing noises, it’s not just annoying—it’s a sign something’s wearing out. You can’t fix a failing magnetron yourself, and replacing it often costs more than a new microwave. That’s why many people skip repairs and just buy new.

But not always. If your microwave is under 5 years old and the issue is a simple fix—like a blown fuse, a faulty keypad, or a broken turntable roller—it’s usually worth repairing. A $50 fix beats a $200 replacement. And if you’re someone who uses your microwave multiple times a day, investing in a higher-end model with better build quality can pay off over time. Brands with solid warranties and replaceable parts tend to last longer. Also, keeping it clean and well-ventilated helps. Grease buildup can overheat components. Blocking the vents? That’s a quick way to shorten its life.

There’s also the environmental angle. Throwing out a still-functional microwave adds to e-waste. Repairing it—even if it costs a little more—can be the smarter choice if the core parts are still good. That’s why so many repair guides focus on DIY fixes for common issues like no heat, sparking inside, or the display going dark. These aren’t always signs of total failure. Sometimes it’s just a capacitor or a relay that needs swapping.

Below, you’ll find real-world advice from people who’ve been there. We’ve pulled together guides on diagnosing microwave problems, when to call a pro, and how to tell if your unit is nearing the end of its run. Whether you’re trying to stretch out a 6-year-old microwave or deciding if it’s time to upgrade, these posts give you the facts—not the fluff.