Microwave Lifespan: How Long Do Microwaves Last and When to Replace

Most people don’t think about their microwave, a kitchen appliance that heats food quickly using electromagnetic radiation. Also known as a microwave oven, it’s one of the most used appliances in the home—yet few know how long it’s actually meant to last. On average, a microwave lasts 7 to 10 years. That’s not forever, but it’s long enough to make you question why yours died at year five. Was it bad luck? Poor quality? Or did you just forget to clean it?

What kills a microwave isn’t always the magnetron or the high-voltage diode—it’s often the little things. Grease buildup on the waveguide cover can cause arcing. A worn-out turntable motor makes the plate stop spinning, which leads to uneven heating and more strain on the system. Door seals that crack or warp let microwaves leak, which isn’t just unsafe—it’s a sign the unit is near the end. And if you’ve ever run it empty? That’s a quick way to fry the magnetron. These aren’t rare mistakes. They’re everyday habits that cut years off your appliance’s life.

When your microwave starts taking longer to heat food, makes strange noises, or sparks inside, it’s not just being old—it’s telling you something’s broken. Sometimes, it’s a cheap fix: a new turntable motor costs under £20, and replacing the door switch is simple. But if the control panel is glitchy or the magnetron is dead, repair costs can hit £100 or more. At that point, buying a new one often makes more sense. A decent new microwave costs less than £150, uses less energy, and comes with a warranty. And if yours is older than eight years? You’re probably paying more in electricity than you’d save by repairing it.

It’s not just about money. Old microwaves are less efficient. Newer models heat faster and use less power. They also have better safety features and smarter sensors. If you’re still using a microwave from the early 2000s, you’re not saving money—you’re just waiting for the next breakdown.

Below, you’ll find real-world guides on microwave repair, signs it’s failing, and when it’s smarter to replace it. No fluff. No sales pitches. Just what actually happens when your microwave stops working—and how to decide what to do next.