What Are the Dimensions of a Microwave? Size Guide

Introduction

When you are shopping for a new microwave, one of the first questions that comes to mind is: What Are the Dimensions of a Microwave? The answer is not a single number. Microwaves come in a wide range of sizes, from compact countertop models that fit in a dorm room to large over-the-range units installed above a stove. Understanding microwave dimensions is essential because a microwave that is too large will not fit your available counter or cabinet space, while one that is too small may not hold the dishes you use every day.

This guide explains the standard dimensions for different microwave types, shows you how to measure your space and the appliance, and helps you choose the right size for your kitchen. Whether you are replacing an old unit, buying your first microwave, or planning a kitchen remodel, knowing the exact width, height, and depth will save you time, money, and frustration.

Table of Contents

• Introduction
• What Are the Dimensions of a Microwave?
• Why Microwave Dimensions Matter
• Common Microwave Size Categories
• Standard Microwave Dimensions by Type
• How to Measure a Microwave and Your Space
• Microwave Capacity Versus External Dimensions
• Choosing the Right Size for Your Kitchen
• Installation Clearance and Ventilation
• Common Mistakes When Buying by Dimensions
• Tips and Best Practices
• Frequently Asked Questions
• Conclusion

What Are the Dimensions of a Microwave?

Microwave dimensions refer to the external measurements of the appliance: width, height, and depth. These measurements are usually expressed in inches in the United States, though some manufacturers also list centimeters. Width is measured from the left side of the unit to the right side, including the handle if it protrudes. Height is measured from the bottom of the microwave to the top of the casing. Depth is measured from the back of the unit to the front of the door or control panel, whichever extends farthest.

Because microwave designs vary by style and manufacturer, there is no universal standard that applies to every model. However, most microwaves fall into recognizable size ranges based on their intended use and installation method. Countertop models tend to be the smallest and most portable, while over-the-range and built-in models are larger and designed to integrate with cabinetry.

When you see dimensions listed in a product specification, they almost always refer to the external footprint of the appliance. Internal cooking capacity is listed separately, usually in cubic feet, and it does not directly correlate with external size in a predictable way. A microwave with a large external frame may have thick walls and insulation that reduce the usable interior space.

Why Microwave Dimensions Matter

Choosing the wrong microwave size can create immediate practical problems. If the appliance is too wide for your countertop, it may overhang the edge and become unstable. If it is too deep, it may block a backsplash or prevent a cabinet door from opening fully. If it is too tall, it may not fit beneath an upper cabinet or may interfere with a range hood.

Dimensions also affect ventilation. Microwaves generate heat during operation, and they need adequate airflow around the sides, back, and top to prevent overheating. Placing a large microwave in a tight enclosure without clearance can shorten its lifespan and create a safety hazard. Over-the-range models have additional requirements because they often double as vent hoods and must align with ductwork.

Finally, dimensions influence how you use the microwave. A narrow interior may not accommodate a standard dinner plate or a large casserole dish. A shallow depth may limit the size of containers you can place inside. Knowing the dimensions before you buy ensures the microwave will physically fit in your kitchen and functionally fit your cooking habits.

Common Microwave Size Categories

Microwaves are generally grouped into five main categories based on size and installation style. Each category has a typical dimensional range, though individual models vary.

Compact or Small Microwaves

Compact microwaves are designed for small kitchens, dorm rooms, offices, and bedrooms. They usually measure between 17 and 20 inches in width, 10 to 12 inches in height, and 12 to 16 inches in depth. Internal capacity typically ranges from 0.5 to 0.9 cubic feet. These models are lightweight and easy to move, but they may not fit large plates or multiple containers at once.

Midsize Microwaves

Midsize countertop microwaves are the most common choice for average households. They typically measure 20 to 24 inches wide, 12 to 14 inches tall, and 16 to 20 inches deep. Capacity usually falls between 1.0 and 1.5 cubic feet. This size offers a good balance between counter space and cooking versatility, fitting most standard dinner plates and medium-sized bowls.

Full-Size or Large Microwaves

Full-size countertop microwaves are built for families and people who cook larger meals in the microwave. They generally range from 24 to 30 inches in width, 14 to 18 inches in height, and 18 to 22 inches in depth. Capacity often exceeds 1.5 cubic feet and can reach 2.2 cubic feet or more. These models require significant counter space and may be too heavy to move frequently.

Over-the-Range Microwaves

Over-the-range microwaves are mounted above a cooking range and often include a ventilation fan and light. They are usually about 30 inches wide to match standard stove dimensions. Height typically ranges from 15 to 18 inches, and depth is often 15 to 17 inches. Capacity usually spans 1.6 to 2.1 cubic feet. Installation requires precise measurements because the unit must align with cabinets above and the range below.

Built-In Microwaves

Built-in microwaves are installed directly into cabinetry or a wall oven enclosure. Their dimensions vary more widely because they are designed to fit specific cabinet openings. Common widths include 24, 27, and 30 inches. Heights often range from 14 to 18 inches, and depths can be 20 to 23 inches or more depending on the model. Because built-in units are integrated into the kitchen structure, accurate measurements are critical before purchase.

Standard Microwave Dimensions by Type

The table below summarizes typical external dimensions and capacities for each major microwave type. These figures represent common ranges, so you should always check the specifications for the exact model you are considering.

How to Measure a Microwave and Your Space

Measuring correctly is the most important step before buying a microwave. You need to measure both the space where the microwave will go and the microwave itself if you are replacing an existing unit. Follow these steps to get accurate results. (See Also:How Long To Microwave Green Beans)

1. Gather your tools. You will need a steel tape measure, a notebook or phone for recording numbers, and a level if you are checking cabinet alignment.
2. Measure the width of the available space. Measure from the left edge of the counter or cabinet opening to the right edge. Measure at the back, middle, and front because walls and cabinets are not always perfectly straight. Use the smallest measurement as your maximum width.
3. Measure the height of the available space. For countertop placement, measure from the counter surface to the bottom of the upper cabinet. For over-the-range installation, measure from the top of the cooking range to the bottom of the upper cabinet. Record the smallest height measurement.
4. Measure the depth of the available space. Measure from the back wall to the front edge of the counter or cabinet. Remember to account for backsplashes, trim, and any protruding handles or knobs on nearby cabinets.
5. Check clearance requirements. Most manufacturers recommend at least three inches of space on each side and on top of a countertop microwave for ventilation. Built-in and over-the-range models have specific clearance instructions in the installation manual.
6. Measure the microwave you plan to buy. Check the product listing for width, height, and depth. Confirm whether the listed depth includes the handle and whether the door swings open to the left or right, because door swing affects usable space in front of the unit.
7. Compare the numbers. Subtract the recommended clearance from your available space measurements. The microwave dimensions should be smaller than the resulting available dimensions in every direction.

If you are replacing an old microwave, measure the existing unit as well as the cutout or counter space. Older cabinets may have settled over time, so the opening may not be perfectly square. When in doubt, choose a microwave that is slightly smaller than the maximum available space rather than one that fits exactly.

Microwave Capacity Versus External Dimensions

Many shoppers confuse external dimensions with internal cooking capacity. External dimensions tell you whether the microwave will fit in your kitchen. Internal capacity, measured in cubic feet, tells you how much food you can cook at once. These two measurements are related, but they are not interchangeable.

A microwave with a large external footprint may have thick walls, a large control panel, or a convection heating element that takes up interior room. As a result, its usable capacity might be similar to a smaller model with more efficient construction. Conversely, a compact microwave with a simple design may offer more usable interior space than its external size suggests.

When evaluating capacity, think about the containers you use most often. A standard dinner plate is usually about 10 to 12 inches in diameter. A typical casserole dish may be 9 by 13 inches. If you want to heat large platters or cook multiple items at once, look for at least 1.2 cubic feet of interior space. If you only need to reheat coffee, soup, or single servings, 0.7 to 0.9 cubic feet is usually sufficient.

Choosing the Right Size for Your Kitchen

The right microwave size depends on your kitchen layout, household size, and cooking habits. Start by identifying where the microwave will live. If you have a spacious countertop, a midsize or full-size countertop model offers flexibility because you can move it if needed. If counter space is limited, an over-the-range or built-in model frees up valuable surface area.

Consider how many people you cook for. A single person or couple often does well with a compact or midsize microwave. A family of four or more usually benefits from a full-size model with at least 1.5 cubic feet of capacity. If you frequently prepare frozen entrees, steam vegetables, or reheat large leftovers, prioritize interior capacity over external dimensions.

Think about the types of dishes you own. If you use large mixing bowls, oversized mugs, or rectangular baking dishes, measure your largest container and compare it to the interior dimensions of the microwave. Remember that the turntable must rotate freely, so there should be at least an inch or two of space around the container.

Also consider future plans. If you are remodeling your kitchen soon, choose a microwave size that fits your planned cabinetry rather than your current counter. Built-in and over-the-range models are difficult to move once installed, so planning ahead prevents costly modifications later.

Installation Clearance and Ventilation

Proper clearance is as important as the microwave dimensions themselves. Microwaves need airflow to cool internal components. Without enough space around the unit, the appliance can overheat, shut off unexpectedly, or fail prematurely.

For countertop microwaves, leave at least three inches of clearance on the sides and top. Do not place the microwave inside a closed cabinet unless it is specifically designed for built-in use. The back of the microwave should be a few inches from the wall to allow the power cord to connect without strain and to permit air circulation.

Over-the-range microwaves require vertical clearance above the cooking surface, usually between 13 and 16 inches from the stovetop to the bottom of the microwave, depending on local building codes and manufacturer instructions. They also need horizontal clearance to align with adjacent cabinets. If the unit vents to the outside, you must account for ductwork dimensions and routing through the wall or ceiling.

Built-in microwaves must fit precisely within the cabinet opening. Most manufacturers provide a cutout template with exact width, height, and depth requirements. Follow the template carefully, and allow for the trim kit if one is included or sold separately. A trim kit covers gaps between the microwave and the cabinetry, but it cannot fix a microwave that is too large for the opening.

Common Mistakes When Buying by Dimensions

One of the most frequent mistakes is measuring only the counter space and ignoring clearance. A microwave that fits the counter exactly may not have room for ventilation, and the door may not open fully if it sits flush against a wall or cabinet.

Another mistake is assuming that a higher cubic-foot rating means a larger external footprint. Some compact models are designed with efficient interiors, while some large external models have thick insulation that reduces usable space. Always check both external dimensions and internal capacity.

Shoppers also forget to account for the power cord and plug. The cord can add several inches to the required depth behind the microwave. If the outlet is located directly behind where the microwave will sit, the plug may push the unit forward and create an unstable overhang. (See Also:Can You Use Microwave With Pacemaker)

Door swing is another overlooked factor. If the microwave door opens to the right and you place the unit in a corner, the door may hit the adjacent wall and not open far enough to remove hot food safely. Check the hinge direction before finalizing placement.

Finally, many buyers ignore the weight of the microwave. Full-size and built-in models can weigh 50 pounds or more. Make sure your countertop or shelf can support the weight, and use proper mounting hardware for over-the-range and built-in installations.

Tips and Best Practices

Measure twice and order once. Record your measurements in inches and centimeters, and bring them with you when shopping or keep them saved on your phone when browsing online.

Check the manufacturer’s installation manual before buying a built-in or over-the-range model. The manual includes exact cutout dimensions, clearance requirements, and electrical specifications that are not always listed on the product page.

If you are replacing an existing microwave, take a photo of the current installation, including the power outlet location and any mounting brackets. This helps you compare the old unit to the new one and identify potential issues.

Consider a trim kit for built-in models. A trim kit creates a finished look and hides gaps between the microwave and the cabinet, but it adds to the overall width and height. Include trim kit dimensions in your planning.

Test the door swing in your kitchen before finalizing placement. Stand where you would normally load and unload the microwave, and make sure you can open the door completely without obstruction.

For over-the-range models, verify whether you want external venting or recirculating ventilation. External venting requires ductwork and may affect cabinet depth, while recirculating models use filters and are easier to install but less effective at removing heat and odors.

Frequently Asked Questions

What are the standard dimensions of a countertop microwave?

Most countertop microwaves fall into three size ranges. Compact models are about 17 to 20 inches wide, 10 to 12 inches tall, and 12 to 16 inches deep. Midsize models are roughly 20 to 24 inches wide, 12 to 14 inches tall, and 16 to 20 inches deep. Full-size models range from 24 to 30 inches wide, 14 to 18 inches tall, and 18 to 22 inches deep. Always check the specific product listing because dimensions vary by brand and model.

How do I measure the space for a microwave?

Measure the width, height, and depth of the area where the microwave will go. Use a steel tape measure and record the smallest measurement in each direction because walls and counters are not always perfectly straight. Subtract at least three inches from each side for ventilation clearance, then compare those numbers to the microwave’s external dimensions. (See Also:What Size Inverter For Microwave)

Are over-the-range microwaves a standard size?

Over-the-range microwaves are usually about 30 inches wide to match standard cooking ranges. Heights typically range from 15 to 18 inches, and depths are often 15 to 17 inches. However, mounting height and cabinet alignment vary by kitchen, so you should measure the space above your range before purchasing.

Does a larger microwave always have more cooking capacity?

Not necessarily. External dimensions describe the outside size of the appliance, while capacity describes the usable interior space in cubic feet. A large external microwave with thick walls may have less usable capacity than a smaller model with efficient construction. Check both measurements before deciding.

Can I put a countertop microwave inside a cabinet?

Only if the microwave is specifically rated for built-in use. Standard countertop models need open airflow around the sides and top, and enclosing them in a cabinet can cause overheating. Built-in models are designed with proper ventilation for cabinet installation and usually require a trim kit.

Does microwave depth include the handle?

It depends on the manufacturer. Some product listings include the handle in the depth measurement, while others list the depth of the main casing only. When measuring your space, add an extra inch or two to be safe if the listing does not specify whether the handle is included.

How much does a typical microwave weigh?

Compact microwaves may weigh 20 to 30 pounds. Midsize models often weigh 30 to 50 pounds. Full-size, over-the-range, and built-in models can weigh 50 to 75 pounds or more. Make sure your counter, shelf, or mounting hardware can support the weight of the unit you choose.

Conclusion

Knowing What Are the Dimensions of a Microwave? is the first step toward choosing an appliance that fits your kitchen and your cooking needs. Microwave sizes vary widely by type, from compact countertop units to large over-the-range and built-in models, so there is no single standard dimension that applies to every microwave. By measuring your available space, checking clearance requirements, and comparing external dimensions with internal capacity, you can avoid common buying mistakes and select a model that works for your household.

Whether you need a small microwave for a dorm room or a full-size unit for a family kitchen, taking accurate measurements before you shop will save you time, money, and the hassle of returns or modifications. Use the size categories and measurement steps in this guide as your reference, and always verify the specifications for the exact model you intend to purchase. With the right dimensions in hand, you can confidently choose a microwave that fits your space and serves your needs for years to come.