Can You Put a Metal Coffee Cup in the Microwave? | Find Out the Answer Now!

Do not microwave metal coffee cups or any cups with metal components. Stainless steel exteriors will block microwaves and can be dangerous. Learn more about using metal coffee cups in the microwave with helpful tips and advice.

Are you wondering if you can put a metal coffee cup in the microwave?

You’re not alone. Many of us have asked this same question, and it’s essential to get the right answer. The short answer is no, you should not put a metal coffee cup in the microwave. But why?

In this article, I’ll explain why you should avoid putting metal coffee cups in the microwave, and what types of mugs are safe to use. I’ll also share some tips for heating your coffee without using a microwave.

By the end of this article, you’ll better understand the safety concerns surrounding metal coffee cups in the microwave and how you can safely heat up your coffee.

What is a Metal Coffee Cup?

A metal coffee cup is typically made from stainless steel or aluminum and is designed to keep your drink hot for a more extended period of time than other types of mugs. They are often used to make cold brew or iced coffee drinks, as they help keep the drink cold for more extended periods. Metal coffee cups can come with either insulated or non-insulated walls and are usually designed with a handle for easier drinking.

Can You Put a Metal Coffee Cup in the Microwave?

No, you should not put a metal coffee cup in the microwave. Metal containers are inappropriate for microwaves as the microwaves will be reflected off the metal and won’t heat up the food or beverage.

An electric arc is when electricity jumps from one point to another, and it can cause severe damage to your microwave and even start a fire. Additionally, microwaves use electromagnetic radiation to heat food molecules, which metal does not absorb very well. This means that even if you don’t cause an electric arc, your metal mug will likely not heat up your drink quickly or evenly.

Can You Put Other Types of Mugs in the Microwave?

While metal mugs should not be put in the microwave, other types of mugs are safe to use. Glass mugs are one option, as long as they do not have any metallic trim or decorations.

Plastic and ceramic mugs are also safe in the microwave, but you should always check the label to ensure they are labeled “microwave safe” before using them. Additionally, some travel mugs are made from stainless steel and have plastic or ceramic liners that make them safe to use in the microwave.

How to Heat Up Your Coffee Without Using a Microwave

If you don’t have access to a microwave or want to avoid using one altogether, there are still ways that you can heat up your coffee without using one. One option is to use a stovetop espresso maker or French press to heat up your coffee quickly and evenly.

You can also use an electric kettle or stovetop kettle to heat up water and then use it to make your coffee with a pour-over method or French press.

Additionally, suppose you have cold coffee left over from the day before. In that case, you can put it in a mug and place it in the oven at low temperatures (200-250 degrees Fahrenheit) for 10-15 minutes to heat it up without damaging your mug or starting a fire.


In conclusion, it’s important to remember that metal mugs should never be placed in the microwave due to their ability to conduct electricity and their inability to absorb microwaves effectively. However, other types of mugs are safe to use in the microwave, such as glass, plastic, and ceramic mugs labeled “microwave safe.” Additionally, there are other ways that you can heat your coffee without using a microwave, such as using an espresso maker or French press, an electric kettle or stovetop kettle, or simply placing your mug in an oven at low temperatures for 10-15 minutes.

By following these tips and avoiding putting metal mugs in the microwave, you can ensure your coffee stays hot while keeping yourself safe from potential fire hazards.


Can you put a stainless steel mug in the microwave?

It is not recommended to put a stainless steel mug in the microwave as it can cause sparks and block the microwaves from penetrating through to the drink inside. If a stainless steel mug is accidentally microwaved, it should be given a good scrub and remembered not to be microwaved again.

Can you put aluminum cup in the microwave?

Aluminum cups should not be put in the microwave as they are good conductors of heat and can cause arcing, and damaging to the oven. Additionally, microwaves reflect off metal surfaces, blocking the waves from heating food. Ceramic mugs are safe to use in the microwave.

Is it safe to put metal in the microwave?

Some metal is safe to use in a microwave, such as the Anyday lid, as long as it is smooth and contains no water. However, metal should not be used to heat food in a microwave, as it can cause sparks and damage the oven.

Can you microwave metal tumbler?

No, metal tumblers like Yeti cups should not be microwaved. Metal reflects microwaves instead of absorbing them, creating a fire hazard. Additionally, the cup’s insulation will prevent the contents from getting heated.

What metal Cannot go in microwave?

Metal objects with multiple pieces, thin or sharp edges, and solid ones should not be placed in the microwave. Metals are good conductors of electricity because they contain many electrons that move about freely. Metal does not absorb microwaves well since it does not contain any water.

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Nick Cho
Nick Cho

Nick Cho is a Korean-American entrepreneur and specialty coffee expert. Cho is a writer, speaker, and social media influencer, inspiring excellence in the specialty coffee industry.

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