When it comes to choosing a new microwave, one of the first questions that often arises is, "What is the standard microwave opening size?" Understanding this can help you ensure a perfect fit in your kitchen, whether you're replacing an existing microwave or installing one for the first time. Let's delve into the world of microwave sizes to help you make an informed decision.
Understanding Microwave Sizes
Microwaves come in various sizes, typically measured in cubic feet or by their interior dimensions. The size you need depends on your specific requirements, such as the types of dishes you'll be heating and the available space in your kitchen. Here's a breakdown of common microwave sizes:
- Compact (0.7 - 0.9 cubic feet): Ideal for small apartments or homes with limited counter space.
- Mid-size (1.0 - 1.5 cubic feet): A popular choice for most households, offering a balance between capacity and counter space.
- Large (1.6 - 2.0 cubic feet): Perfect for families or those who frequently heat large dishes or multiple items at once.
Standard Microwave Opening Sizes
When discussing standard microwave opening sizes, we're typically referring to the cutout dimensions required for built-in or over-the-range models. These sizes are usually measured in inches and refer to the width, height, and depth of the opening.

| Microwave Size | Width (inches) | Height (inches) | Depth (inches) |
|---|---|---|---|
| 24-inch (Standard) | 24 | 14-15 | 15-16 |
| 30-inch (Built-in) | 30 | 15-16 | 18-20 |
| 36-inch (Professional) | 36 | 18-20 | 24-25 |
Note that these dimensions can vary slightly between manufacturers, so it's essential to double-check the specific model you're interested in before making a purchase.
Factors to Consider When Choosing a Microwave Size
Besides the opening size, there are other factors to consider when selecting a microwave:
- Power level: Higher wattage means faster heating, but it also means higher energy consumption.
- Features: Consider what features are essential to you, such as presets, sensor cooking, or inverter technology.
- Installation type: Determine whether you need a countertop, built-in, or over-the-range microwave, as this will affect the size and installation process.
Tips for Measuring Your Microwave Opening
If you're replacing an existing microwave, it's crucial to measure the opening accurately to ensure a perfect fit. Here are some tips for measuring:

- Use a measuring tape to determine the width, height, and depth of the opening.
- Measure the interior dimensions, not the exterior.
- Consider any additional space required for ventilation, if applicable.
By understanding standard microwave opening sizes and considering your specific needs, you can make an informed decision when choosing a new microwave. Happy shopping!
More Details
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Microwave sizes vary by type, but there are some standardized dimensions you can usually count on. Most over-the-range microwaves are roughly 30" wide, 17" high ...

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Closed door depths may range from 15" (38 cm) to 18" (46 cm) whereas open door depths range from 42" (107 cm)to 45" (114 cm). The standard width of over-the- ...

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Standard-sized countertop microwaves measure 21" – 25" wide, 12" – 15" tall, and 16" – 20" deep with the door closed. With the door open, the depth of ...

Open-door depths will run from 42" to 45", but the standard width of over-the-range microwaves ensures that all models will have a similar swing-out radius.

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