How to Choose the Right Dimension of Microwave: Full Guide

This guide explains common microwave sizes and shows you how to measure your space and appliance properly, so everything fits as expected.

Standard Dimensions of a Microwave

The standard dimensions of a microwave account for the external width, height, and depth. While exact measurements vary by brand, they fall within a predictable range. Below are the typical microwave sizes:

• Width: 20–24 inches
• Height: 12–14 inches
• Microwave depth: 16–20 inches

These measurements describe the average microwave dimensions used in many homes. They fit most counters and allow safe ventilation space.

Microwave Oven Size by Type

• There are different types of microwaves. Their standard size falls into different ranges. Below are the typical microwave oven dimensions of the 3 main designs.

1. Countertop Microwaves

Countertop models are the most common type, with an interior capacity of 0.7–1.6 cubic feet. Their over-the-counter design fits standard kitchen counters and shelves. They also require no cabinet modification. Consequently, they become a preferred choice for many households. The average specs of countertop microwaves fall into the following:

• Width: 18–24 inches
• Height: 10–14 inches
• Depth: 14–20 inches

There are also more compact units with small microwave measurements. They are especially beneficial for dorms, studios, or light reheating. You can also find multifunctional countertop microwaves. For instance, some Midea 4-in-1 models combine microwave, air fry, steam, and bake features into one. The added versatility satisfies a wide range of daily needs and reduces your kitchen time. 



2. Over-the-Range (OTR) Microwaves

Over-the-range microwaves are also called over-the-stove microwaves or above-range microwaves. They generally have an interior capacity of 1.6–2.1 cubic feet. The sleek design is one of their most significant benefits. They combine a microwave and range hood, and are designed to be installed above a stove. This way, it doesn’t take counter space. Some advanced models have built-in ventilation to help remove smoke, steam and cooking odor. Thus, you can enjoy a cleaner and more organized kitchen. That’s why they are preferred in condos, apartments and smaller homes. Typical OTR microwave sizes include:

• Width: about 30 inches
• Height: 16–18 inches
• Depth: 15–18 inches

3. Built-in or Cabinet Microwaves

• Built-in microwaves are installed directly into pre-existing cabinetry, like a cabinet or under a counter. You can pull out like a drawer or open down like a wall oven. They usually offer 1.2–2.2 cubic feet of capacity. These microwave dimensions also vary depending on the cabinet cutout.
• l Width: 24–30 inches
• l Height: 17–22 inches
• l Depth: 20–25 inches
• This comparison shows the typical microwave sizes by design.

Microwave Type	Typical Width	Height	Depth	Capacity
Compact countertop	18–20 in	10–12 in	12–14 in	0.5–0.9 cu ft
Standard countertop	20–24 in	12–14 in	16–20 in	1.0–1.6 cu ft
Over-the-range (OTR)	~30 in	16–18 in	15–18 in	1.6–2.1 cu ft
Built-in microwave	24–30 in	17–22 in	20–25 in	1.2–2.2 cu ft

How Do You Measure for a Microwave?

Before taking a new microwave home, you should determine the space on your countertop or shelves that you want it to occupy. Here are a few simple steps to prevent installation failures.

Step 1. Measure for Width, Height, and Depth

Use a measuring tape to determine the exact dimensions of the space where the microwave will sit. For built-in or over-the-range models, measure the interior of the cabinet opening rather than the old appliance.

Step 2. Account for Ventilation

Small gaps on the sides or back of microwaves allow heat to escape during operation. Most appliances require at least 3 inches of clearance on the sides and rear, and 12 inches of open space above to prevent overheating.

Step 3. Check Door Swing

Open the microwave door fully to ensure it does not hit adjacent walls, cabinets, or refrigerator handles. Measure the depth of the unit with the door open at a 90° angle.

Step 4. Evaluate Cord Reach

Measure the distance to the nearest grounded electrical outlet. Avoid using extension cords. This can pose a fire hazard or lead to power inconsistencies.

Step 5. Confirm Cabinet Depth

Standard kitchen cabinets are typically 12 to 24 inches deep. Ensure the microwave’s feet sit securely on the surface or within the shelf without overhanging.

What Factors Should You Consider When Choosing Microwave Dimensions?

Choosing the right microwave size depends on your kitchen layout and how you plan to use it every day. A unit that fits the space but feels too small or too large can be inconvenient over time.

Here are some key factors to consider when selecting the right microwave oven size for your needs.

• Kitchen Layout and Clearance: Consider the “work triangle” in your kitchen. Ensure the microwave location doesn’t create a bottleneck when the door is open. Space above the cooktop is a must for over-the-range microwaves. This ensures safe airflow and cooking comfort. Verify that the distance between the cooktop and the bottom of the unit meets local safety codes.
• Installation Type: Different installations use different microwave sizes. Built-in units require cabinet openings. Always factor in the dimensions of these finishing pieces to ensure a flush, professional appearance with your cabinetry. OTR models require proper clearance.
• Cooking Habits and Dish Size: Measure your most frequently used cookware, such as large dinner plates or rectangular casserole dishes. Ensure the internal turntable diameter can accommodate these items without hitting the interior walls.
• Frequency of Use: If you mainly use the microwave for simple tasks like melting butter or reheating coffee, a smaller model can save valuable counter space. If you rely on it more often for cooking full meals or larger portions, choosing a bigger size will give you more flexibility and convenience.
• Household Size: Bigger microwaves offer higher cubic footage. This benefits larger households. While individuals or couples may find a compact or mid-size model more efficient.

Conclusion

The sizes of countertop units, built-in models, and OTR designs fall into different ranges. Understanding the dimensions of microwaves helps ensure a clean kitchen layout and safe installation. Then, you can find a more suitable one that fits both the kitchen and daily cooking needs. Bookmark this comprehensive size guide for any further checking!

FAQs

How much space is needed around a microwave?

Most models require at least 3 inches of clearance on the sides and rear, with 12 inches of open space above the unit. This ventilation allows heat to dissipate and prevents overheating.

Where should you not put a microwave in the kitchen?

Never put a microwave in somewhere block essential ventilation gaps or near heat-producing appliances. Also, don’t install countertop models in tight, unvented cabinets or near water sources where splashing might occur.

Does a larger microwave always mean more interior capacity?

Not necessarily. While larger footprints often accommodate higher capacities, thick insulation or specialized features can reduce the actual usable internal space.

Should the microwave be above or below the oven?

It depends on kitchen layout and how the appliances are used. Over-the-range models must be installed above the oven and work better in smaller kitchens. For larger kitchens that need easier access, you can put built-in drawer models below the oven or in a cabinet.