What Are the Dimensions of a Microwave? Step-by-Step Guide

Introduction

When shopping for a new appliance or trying to fit one into an existing spot, one of the first questions people ask is: What Are the Dimensions of a Microwave? The answer is not as simple as a single set of numbers, as microwaves come in a wide range of sizes depending on their style, intended use, and capacity. Knowing the correct dimensions can mean the difference between a smooth installation and a unit that simply will not fit in the space you have planned for it.

Microwave dimensions are more than just the width, height, and depth listed on a box. There is a key difference between exterior measurements and interior cooking space, as well as important factors like required clearance, cabinet cutouts, and the type of microwave you are considering. For counter models, depth can be tricky due to the door swing. For over-the-range models, height and venting considerations matter just as much as width. For built-in and drawer styles, the cutout dimensions matter far more than simply placing the unit on a counter.

This guide is built to walk through every part of this topic in a practical way. By the end, you will know how to read microwave dimensions correctly, how to measure your own space, how to match a microwave to your needs, and how to avoid the most common sizing mistakes. The goal is to give you a clear, usable approach so that you can make a confident decision based on accurate measurements rather than guesswork.

Table of Contents

• Understanding Microwave Dimensions
• Exterior vs Interior Dimensions
• Common Microwave Types and Their Dimensions
• Microwave Capacity and How It Relates to Size
• How to Measure a Microwave: Step-by-Step
• Measuring Your Space for a Microwave: Step-by-Step
• Clearance Requirements for Safe and Practical Use
• Comparing Microwave Dimensions by Category
• Tips and Best Practices for Choosing the Right Size
• Common Mistakes to Avoid
• Frequently Asked Questions
• Conclusion

Understanding Microwave Dimensions

Before comparing models, it helps to know what is actually being measured when a product lists its dimensions. In most cases, manufacturers list the overall exterior dimensions. These are the measurements taken from the outermost points of the microwave, including the body and, in some listings, the handle. However, small differences can occur between brands depending on how they round or what they choose to include.

The three core measurements are width, height, and depth. Width is almost always measured from the left outer edge to the right outer edge. Height is measured from the bottom outer edge to the top outer edge. Depth is measured from the very back of the unit to the very front of the unit, with the door closed. If a listing does not clarify this, assume it is the closed-door depth.

It is worth noting that depth with the door open is a separate figure. This is often overlooked, yet it is one of the most practical measurements for counter use. A microwave may fit in a tight counter alcove in terms of width and height, but still be awkward if the open door blocks a walkway or cannot fully open in that spot.

When trying to answer What Are the Dimensions of a Microwave? with certainty, the correct approach is to look at three sets of numbers in context: exterior dimensions, interior dimensions, and required space for the location you intend to use it in.

Exterior vs Interior Dimensions

One of the most common points of confusion is the gap between what the box takes up and how much actual cooking space is inside. Exterior dimensions tell you where the unit goes. Interior dimensions tell you what will realistically fit inside.

Exterior Dimensions Explained

Exterior measurements determine placement. For a countertop model, these tell you if it will sit on your available counter area without crowding other items. For an over-the-range model, the width must be compatible with the range below. For a built-in model, the exterior width and height often need to align with a specific cutout, and depth is just as strict.

Interior Dimensions Explained

The interior is the usable cavity where food and cookware go. This is measured from the back wall of the cooking cavity to the inner door surface with the door closed, from side wall to side wall, and from the bottom floor of the cavity to the top interior wall. Turntables take up some space, and oddly shaped dishes may not fit even if the raw interior numbers look generous.

As a general rule, there is always a noticeable difference between the two. A compact unit may have a relatively small cavity, while some mid-sized units make better use of their interior space through cavity shape. Larger exteriors do not automatically mean the easiest fit for wide or tall dishes, so checking interior dimensions is just as important as checking exterior ones.

Common Microwave Types and Their Dimensions

Different microwave styles are designed for different placements, and each comes with its own typical size range. Knowing these ranges will help you narrow down realistic options before taking precise measurements.

Countertop Microwaves

Countertop microwaves are the most common and the most flexible. They simply sit on a flat, stable surface and only need access to a power outlet.

• Compact (0.5 to 0.8 cu. ft.): Exterior width often around 17 to 19 inches, height around 10 to 12 inches, depth around 12 to 14 inches.
• Mid-sized (0.9 to 1.2 cu. ft.): Exterior width often around 19 to 21 inches, height around 11 to 13 inches, depth around 14 to 16 inches.
• Full-sized countertop (1.3 to 1.6 cu. ft.): Exterior width often around 21 to 24 inches, height around 12 to 14 inches, depth around 16 to 19 inches.

For countertop units, always account for door swing clearance in front of the unit, not just the space under any cabinet above.

Over-the-Range Microwaves

Over-the-range microwaves are designed to sit above a standard cooking range, combining a microwave with a built-in hood. Because they are meant to align with the range, width is the most standardized measurement for this style. (See Also:Make Cheesecake Microwave)

• Standard width: Most are around 29 to 30 inches wide to match a 30-inch range.
• Typical height: Often around 16 to 18 inches tall.
• Typical depth: Often around 15 to 17 inches deep from back to front of the cabinet body.
• Capacity range: Usually between 1.5 cu. ft. and 2.1 cu. ft.

For this style, you must also consider the mounting height above the cooktop, as well as the space between the bottom of the unit and the cooking surface. Depth is especially important here, since a unit that is too deep can stick out past the range front.

Built-In Microwaves

Built-in microwaves are designed to be installed into a wall cabinet or a purpose-built cabinet enclosure for a flush, integrated look. For these, the cutout dimensions are far more important than how much counter space they would take up.

• Typical widths: Often 24, 27, or 30 inches to match common cabinet widths.
• Typical heights: Often 17 to 22 inches depending on trim kit requirements.
• Typical depths: Often 20 to 25 inches for the full unit, but the cabinet cutout depth is usually the number to match.
• Capacity range: Commonly between 1.0 cu. ft. and 2.0 cu. ft.

Always follow the exact cutout specifications for that specific model and trim kit. Relying only on “built-in” as a category is not enough for a proper fit.

Microwave Drawers

Microwave drawers slide out from below a counter, island, or lower cabinet. They save counter space and can be more ergonomic, but they have very strict opening space requirements.

• Typical widths: Often 24, 30 inches in many configurations.
• Typical heights: Often 15 to 17 inches for the drawer body.
• Typical depths: Often 23 to 26 inches overall, with exact cutout depth being critical.
• Capacity range: Commonly between 1.0 cu. ft. and 1.6 cu. ft.

For a drawer, you need unobstructed front clearance for the drawer to fully pull out, as well as proper toe space considerations depending on the cabinet layout.

Compact and Specialty Microwaves

Some spaces call for very small units. Dorm rooms, small offices, or tight galley setups often use true compact models. There are also low-profile designs, but even these need to be measured against your exact constraints.

For true compact units, exteriors can be under 18 inches wide. While they save space, interior cavity height can be limited, which may restrict taller mugs or certain bowls.

Microwave Capacity and How It Relates to Size

Microwave capacity is measured in cubic feet and refers to the approximate volume of the interior cooking cavity. While there is a correlation between capacity and exterior dimensions, it is not a direct one-to-one match. Cavity shape, turntable diameter, and internal layout all play a role.

• 0.5 to 0.7 cu. ft.: Best for reheating small portions, single servings, or very tight spaces.
• 0.8 to 1.0 cu. ft.: A common compact range that can handle most everyday bowls with a bit more flexibility.
• 1.1 to 1.4 cu. ft.: The sweet spot for many households, able to fit standard dinner plates and a wide range of everyday dishes.
• 1.5 to 1.9 cu. ft.: Better for larger plates, wider bowls, or families that need more room.
• 2.0 cu. ft. and above: Usually found in larger over-the-range or some specialty units, though not as common as mid-sizes.

A useful habit is to think in terms of fit for your dishes rather than capacity alone. If you regularly use a specific large bowl or a wide plate, measure that item and compare it to the stated interior dimensions or a physical model if possible.

How to Measure a Microwave: Step-by-Step

If you already have a microwave and need its exact dimensions for replacement, relocation, or comparison, follow this step-by-step approach.

1. Prepare a flat surface. Place the microwave on a level counter or floor with enough room around it to measure all sides.
2. Measure width. Using a tape measure, measure straight across the front from the absolute left outer edge to the absolute right outer edge. Keep the tape level.
3. Measure height. Measure from the bottom outermost edge to the top outermost edge. If the feet are part of the body, include them. Do not guess based on the control panel height alone.
4. Measure depth with door closed. Measure from the very back outer surface to the very front outer surface with the door fully closed. Pay attention to any slight protrusions.
5. Measure depth with door open. With the door open to its normal fully open position, measure from the back outer surface to the front edge of the open door. This is the true clearance needed in front.
6. Measure interior width. Open the door and measure from one inner side wall of the cavity to the opposite inner side wall.
7. Measure interior height. Measure from the floor of the cooking cavity to the underside of the top interior wall.
8. Measure interior depth. Measure from the back wall of the cavity to the inner front edge of the cavity opening, or to the door frame depending on how you plan to test dish fit.
9. Measure turntable diameter. If the turntable is removable, measure its diameter across the widest point. This helps predict fit for round dishes.
10. Record clearly. Write down all numbers in inches, keeping exterior and interior in separate lists to avoid mixing them up later.

Measuring Your Space for a Microwave: Step-by-Step

Knowing What Are the Dimensions of a Microwave? in general is only half of it. You need your actual available space measured with the same level of care. Use this step-by-step method for the most reliable results.

1. Define the exact location. Decide if it is strictly countertop, above a range, in a cabinet cavity, or for a drawer. Each location has different priorities.
2. Measure the width of the opening. For an open counter spot, measure the usable width with nothing blocking. For a cabinet cutout, measure at the narrowest point of that opening, not just the front face.
3. Measure the height of the opening. Measure from the support surface up to the lowest obstruction above. For over-the-range, measure from the top surface of the range to the underside of any cabinet or hood structure. For cabinets, measure the full interior height of the cavity.
4. Measure the depth of the opening. Measure from the back wall to the front edge of the counter, shelf, or cabinet face. Do not measure to a decorative trim that sticks out unevenly. Use the most limiting point.
5. Check for obstructions. Look for outlets, light switches, range controls, handles, backsplashes with thick edges, or cabinet frames that intrude into the opening.
6. Plan for door swing or drawer pull. For countertop, mark out the arc the door would need. For drawers, ensure there is full, unobstructed space in front with nothing in the way.
7. Account for ventilation. For enclosed spaces, do not assume a tight, zero-clearance fit unless the model is specifically designed for it. Many enclosed locations need breathing room.
8. Leave a small margin where practical. Aim for a little usable headroom rather than measuring to the absolute millimeter with no wiggle room. This makes placement less stressful and allows for minor variances.
9. Test with a template. Cut a piece of cardboard to the exterior dimensions you are considering and place it in the spot. Test door swing, visibility, and access. This simple step catches issues that numbers alone miss.
10. Verify with the exact model specs. Once you have a specific model in mind, ignore category averages and use its published exterior, cutout, or mounting dimensions for your final check.

Clearance Requirements for Safe and Practical Use

Clearance is often the missing piece when people run into fit issues. Even if the microwave body fits the opening, neglecting clearance can make it hard to use or can crowd the area around it.

Countertop Clearance

• Front: Leave enough open space in front for the door to open fully and for you to comfortably place and remove items.
• Back: Many countertop models need a small amount of space between the back of the unit and the wall. Do not push it flush against a tight corner unless the manual allows it.
• Sides: Some units need a little side clearance, especially if placed near another appliance or a cabinet side.
• Above: If there is a cabinet directly above, check the vertical gap. You still need enough clearance to open the door and to use the unit without the top edge being forced against the cabinet.

Over-the-Range Clearance

• Above cooktop: Follow the recommended distance between the bottom of the microwave and the cooking surface. This is important for both usability and for keeping the area practical.
• Side alignment: Ideally, the unit should be centered over the range for a clean fit and proper coverage of the cooktop area.
• Depth projection: Check how far it extends past the front of the range. Excess projection can be in the way of handles or daily movement.
• Cabinet compatibility: Ensure the mounting space matches the required width and that there is proper support for the mounting system.

Built-In and Drawer Clearance

• Cutout tolerance: Cutouts often have a narrow acceptable range. Being slightly over can be a problem, and being forced to shave a finished cabinet is rarely ideal.
• Ventilation space: Enclosed installs often rely on specific airflow paths. Blocking these with tight packing can limit proper ventilation.
• Drawer front clearance: Nothing should sit in front of the drawer that would stop it from opening to its full extension.
• Rear and side: Pay close attention to wiring, plumbing nearby, or any framing that reduces the usable cutout depth.

Comparing Microwave Dimensions by Category

The table below gives a realistic view of typical ranges across the most common styles. Treat these as general guidelines, not exact numbers for a specific model. Always use the exact specifications for any unit you are seriously considering. (See Also:Heat Steak Microwave)

Tips and Best Practices for Choosing the Right Size

With so many variables, a practical approach is better than chasing the biggest model. Use these tips to get the right balance of fit and function.

• Measure twice, confirm once. Take physical measurements of your space and any dish you cannot live without. Do not rely on memory.
• Prioritize your limiting factor. For some spots it is width, for others it is depth or height. Find your tightest measurement and work around it first.
• Think about daily items. Test against the plates, bowls, and containers you use most. A turntable that is a couple of inches too small can be surprisingly limiting.
• Do not ignore open-door depth. If the unit will go near a walkway, island edge, or tight kitchen path, the door-open measurement can affect traffic flow.
• Use cardboard for certainty. A simple mockup reveals problems faster than trying to visualize numbers on a page.
• Check cutouts, not just exteriors. For built-in or drawer styles, treat the manufacturer’s cutout page as the one to follow.
• Leave breathing room. Where the manual suggests clearance, do not shrink below it to force a fit.
• Consider future use. If you plan to use larger dishes occasionally, it is worth a little extra interior room, as long as it still fits your location.
• Compare interior height too. Flat lids, tall mugs, or covered bowls can run into the top of the cavity even if the diameter fits.
• Keep outlet access in mind. The power source must be reachable without stretching cords across tight, awkward gaps.

Common Mistakes to Avoid

Most sizing issues come from a few repeatable mistakes. Avoiding these will save time and effort.

• Confusing exterior and interior. Assuming the cooking cavity matches the outer width is one of the most frequent errors.
• Measuring door-closed depth only. For counter units near a walkway, forgetting door-open depth leads to constant obstruction.
• Using cabinet face width instead of cutout width. The inner opening is almost always slightly less than the visible cabinet frame.
• Forcing over-the-range fit by width alone. Failing to check mounting height, projection past the range, or hood alignment causes avoidable issues.
• Ignoring the turntable. A wide rectangular dish may not sit well on a round turntable even if the interior numbers look close.
• Skipping obstructions. Overlooking a backsplash lip, control panel, or frame intrusion can knock a seemingly correct fit off entirely.
• Trusting category averages for a final decision. Averages are helpful for research, but only exact specs are safe for installation.
• Not leaving front clearance. For drawers especially, leaving anything in the full pull path will prevent normal use.
• Measuring with objects still in place. Remove items from the counter, shelf, or cabinet before taking critical measurements.
• Forgetting ventilation needs. Treating a fully enclosed, tight space as zero-clearance can be problematic for many models.

Frequently Asked Questions

What are the most common microwave dimensions for a countertop model?

For a mid-sized countertop microwave, the most common exterior range is around 19 to 21 inches wide, 11 to 13 inches high, and 14 to 16 inches deep with the door closed. Capacities in this range are usually between 0.9 and 1.2 cubic feet, which fits the needs of many households.

For fitting, do exterior or interior dimensions matter more?

Both matter, but for different reasons. Exterior dimensions determine whether the unit will physically fit in the space you have. Interior dimensions determine whether your actual dishes will fit inside. For a replacement in an exact spot, exterior is the priority. For cooking flexibility, interior is just as important.

How much clearance does a countertop microwave need?

There is no single universal number, but a practical approach is to leave open space in front for the door swing, a little room at the back near the wall, and enough vertical space under any cabinet above so the door can open fully. Always check the specific recommendations for your model, as requirements can vary slightly.

Are over-the-range microwaves always 30 inches wide?

Most are 29 to 30 inches wide to match standard 30-inch ranges, but not every model is identical. Some have slightly different widths, and a few are designed for different setups. The safe approach is to match the exact width to your range and verify with the model’s listed dimensions.

Why is door-open depth important when measuring?

Door-open depth shows how far the unit will extend into the room when in use. If your microwave sits near a walkway, next to a kitchen island, or in a narrow galley, a fully open door can block movement. Measuring this prevents everyday inconvenience that closed-door measurements would miss.

What do cutout dimensions mean for built-in microwaves?

Cutout dimensions are the exact width, height, and depth of the empty cabinet opening needed for that unit and its trim kit. The microwave’s exterior body may look close, but the correct fit depends on matching that cutout, not just placing it on a shelf. Always follow the cutout specs from the manufacturer for the exact model.

Does microwave capacity tell me it will fit a large plate?

Not reliably. A higher cubic foot rating usually means more room, but cavity shape and turntable diameter matter more for a specific plate. For example, a wide, square plate may not rotate well on a smaller round turntable. Measuring the interior or testing against your actual plate is far more accurate. (See Also:Cook Kirkland Popcorn Microwave)

What are the typical dimensions for a microwave drawer?

Many microwave drawers fall around 24 to 30 inches wide, 15 to 17 inches high for the drawer unit, and 23 to 26 inches deep overall. The key numbers are the cabinet cutout height, width, and depth, along with leaving unobstructed front space for the full drawer pull.

How can I be sure about what are the dimensions of a microwave for my exact space?

The most reliable method is to combine three steps: measure your space with a tape measure, create a cardboard template to the exterior dimensions you are considering, and only buy after matching those to the exact published dimensions of that specific model, including cutout or clearance notes.

Is it better to have a little extra space or a tight fit?

For most installations, a little usable margin is safer and more practical. A tight, forced fit leaves less room for door swing, makes cleaning harder, and leaves little tolerance for small measurement errors. Follow clearance guidance and aim for a fit that is secure without being crammed in.

Conclusion

Finding the right fit comes down to looking beyond a single number. When asking What Are the Dimensions of a Microwave?, the answer must include exterior size, interior cavity size, the style of microwave, and the space it is going into. Countertop, over-the-range, built-in, and drawer models all have very different priorities, and treating them the same will almost always lead to a sizing mistake.

The most effective approach is a simple one: measure your location first with care, know your must-fit dishes, and compare against exact model specifications. Pay special attention to depth with the door open, cutout dimensions for enclosed installs, and clearance for safe, everyday use. A cardboard template may take a few extra minutes, but it is often the step that prevents the biggest headaches.

By focusing on real measurements instead of category guesses, you can choose a microwave that fits properly, opens freely, uses your space well, and handles the items you actually use on a daily basis. With the steps and guidelines in this guide, you have everything needed to make that decision with confidence and avoid the most common sizing pitfalls.