What Is Smallest Microwave Size? Easy & Quick Sizing Guide

Introduction

If you have ever tried to fit a microwave into a tiny apartment kitchen, a dorm room, an RV, or a cramped office break room, you have probably asked yourself: what is smallest microwave size? The answer is not as simple as one number, because “small” can mean different things depending on whether you are talking about exterior dimensions, interior capacity, or the amount of food you can actually heat inside. This guide breaks down everything you need to know about the smallest microwave sizes available today, how to measure for one, how to choose the right fit, and how to avoid the common mistakes that lead to returns and frustration.

By the end of this article, you will understand the difference between compact, small, and mini microwaves, know the exact dimensions and capacities that define each category, and be able to confidently select a model that fits both your space and your cooking needs. Whether you are outfitting a studio apartment, a boat galley, or a tiny home, this easy and quick sizing guide will walk you through every step.

Table of Contents

• What Is the Smallest Microwave Size?
• Why Microwave Size Matters
• Types of Small Microwaves
• Smallest Microwave Dimensions Explained
• How to Measure for the Smallest Microwave
• Step-by-Step Sizing Guide
• Capacity vs. Exterior Size
• Small Microwave Comparison Table
• Best Uses for the Smallest Microwaves
• Tips and Best Practices
• Common Mistakes to Avoid
• Frequently Asked Questions
• Conclusion

What Is the Smallest Microwave Size?

When people ask “what is smallest microwave size,” they are usually looking for the most compact microwave that can still perform basic heating tasks. In the consumer market, the smallest countertop microwaves typically measure around 15 to 17 inches wide, 10 to 12 inches deep, and 9 to 11 inches tall on the exterior. Their interior capacity usually ranges from 0.5 to 0.7 cubic feet. These models are often marketed as “compact,” “mini,” or “personal” microwaves.

It is important to understand that there is a practical lower limit to how small a microwave can be. A microwave needs enough interior space to hold a standard dinner plate, which is typically 10 to 11 inches in diameter. If the interior is too small, the turntable cannot rotate freely, and food will heat unevenly. Most manufacturers design their smallest models around this constraint, which is why you rarely see a working microwave much smaller than about 0.5 cubic feet of usable capacity.

There are also specialized microwaves designed for very specific environments, such as marine or RV use, that can be even smaller but often sacrifice power and features. These may have capacities below 0.5 cubic feet and wattages under 600 watts. While they do exist, they are not ideal for everyday cooking and are better suited to reheating small items like beverages or single-serve meals.

So, in practical terms, the smallest microwave size that most people should consider is a compact countertop model with roughly 0.5 to 0.7 cubic feet of capacity and exterior dimensions around 15 by 12 by 10 inches. Anything smaller tends to be more of a novelty than a useful appliance.

Why Microwave Size Matters

Microwave size matters for several reasons beyond simply whether the unit fits on your counter. The right size affects cooking performance, energy efficiency, kitchen workflow, and even safety. A microwave that is too large for your space can block ventilation, crowd your counter, and make the kitchen feel cramped. A microwave that is too small may not accommodate the dishes you use daily, forcing you to transfer food to smaller containers or heat in batches.

Size also correlates with wattage in most models. Smaller microwaves typically operate at 600 to 800 watts, while larger models can reach 1,000 to 1,200 watts or more. Lower wattage means longer cooking times and potentially less even heating. If you rely on your microwave for quick meals, a very small unit might frustrate you with slow performance.

Additionally, the interior dimensions determine what you can cook. A compact microwave might fit a standard dinner plate but not a large casserole dish or a whole chicken. Understanding your actual cooking habits before choosing a size will save you from buying a unit that cannot handle your needs.

Finally, size impacts installation. Countertop models simply need clearance, but built-in, over-the-range, and drawer microwaves have stricter size requirements. Knowing the smallest available sizes helps you plan cabinetry, shelving, and ventilation properly.

Types of Small Microwaves

Not all small microwaves are created equal. The category includes several distinct types, each designed for different installation scenarios and use cases. Understanding these types will help you narrow down your search.

Compact Countertop Microwaves

Compact countertop microwaves are the most common small models. They sit on a counter or shelf and plug into a standard outlet. Capacities range from 0.5 to 0.9 cubic feet, and wattages from 600 to 900 watts. These are the most affordable and widely available small microwaves, making them ideal for dorms, apartments, and offices.

Under-Cabinet Microwaves

Under-cabinet microwaves mount beneath upper cabinets, freeing up counter space. They tend to be slightly larger than compact countertop models because they need room for mounting hardware and ventilation. The smallest under-cabinet units usually start around 0.8 cubic feet. They are a good option if counter space is your primary concern.

Microwave Drawers

Microwave drawers are installed below the counter or in an island and pull out like a drawer. They are sleek and space-saving but tend to be larger and more expensive. The smallest drawer models are usually around 1.0 cubic feet, so they are not the best choice if you want the absolute smallest size.

Over-the-Range Microwaves

Over-the-range (OTR) microwaves combine a microwave with a range hood and mount above the stove. These are almost never the smallest option, as they need to span the width of the range below them, typically 30 inches. They are mentioned here only to clarify that they are not part of the “smallest microwave” category.

Portable and Mini Microwaves

Portable mini microwaves are designed for travel, camping, RVs, and boats. Some run on 12-volt power or have very low wattage. These can be as small as 0.3 cubic feet, but their heating performance is limited. They are best for reheating drinks and small snacks rather than full meals.

Smallest Microwave Dimensions Explained

To truly understand what is smallest microwave size, you need to look at three sets of dimensions: exterior width, depth, and height; interior cavity dimensions; and turntable diameter. Each affects whether the microwave will fit in your space and handle your cookware.

Exterior dimensions determine whether the unit fits on your counter or in your cabinet opening. Interior dimensions determine what you can put inside. The turntable diameter is often the limiting factor, because even if the cavity is tall enough, a large plate will not rotate if it exceeds the turntable size.

Here are typical ranges for the smallest microwaves on the market: (See Also:How Long Do You Microwave Chestnuts)

• Exterior width: 15 to 18 inches
• Exterior depth: 11 to 14 inches (excluding handle)
• Exterior height: 9 to 11 inches
• Interior capacity: 0.5 to 0.7 cubic feet
• Turntable diameter: 9 to 10.5 inches
• Wattage: 600 to 800 watts

Keep in mind that manufacturers measure exterior dimensions differently. Some include the handle and door in the depth measurement, while others do not. Always check the product specifications carefully and, when possible, measure the actual unit in a store before buying.

How to Measure for the Smallest Microwave

Before you shop, measure the space where the microwave will live. This step is critical because even a quarter inch of difference can mean the unit does not fit. Here is how to measure properly.

First, measure the width of the available space from wall to wall or cabinet to cabinet. Then measure the depth from the back wall to the front edge of the counter or shelf. Finally, measure the height from the counter surface to the bottom of any upper cabinet or shelf above.

Once you have these three numbers, subtract at least one inch from each dimension to allow for ventilation. Microwaves need airflow around them, especially at the back and sides, to prevent overheating. Some manufacturers specify clearance requirements in their manuals, so check those as well.

Also measure your largest regularly used dish or container. If your favorite dinner plate is 10.5 inches in diameter, you need a turntable at least that large. Write down these measurements and bring them with you when shopping, whether online or in person.

Step-by-Step Sizing Guide

Follow these steps to find the right smallest microwave for your needs.

1. Measure your space. Record width, depth, and height of the intended location, then subtract one inch from each for ventilation clearance.
2. Measure your cookware. Find the diameter of your largest plate or bowl and note it. This determines the minimum turntable size you need.
3. Decide on installation type. Determine whether you want a countertop, under-cabinet, drawer, or portable model based on your kitchen layout and budget.
4. Set a wattage minimum. For everyday reheating, aim for at least 700 watts. Below that, cooking times become noticeably longer.
5. Filter by capacity. Start your search at 0.5 cubic feet and go up only if your space allows and your cookware demands it.
6. Check exterior dimensions. Compare each candidate’s exterior width, depth, and height against your adjusted space measurements.
7. Verify turntable size. Confirm the turntable diameter is at least as large as your biggest plate.
8. Read reviews for noise and heat. Small microwaves can run hot and loud. Check user feedback for real-world performance.
9. Confirm ventilation requirements. Read the manual or product page for specific clearance needs and ensure your space meets them.
10. Make your purchase and test on arrival. When the unit arrives, place it in position, run a test cycle with water, and verify it fits and functions before removing packaging.

Capacity vs. Exterior Size

One of the most confusing aspects of microwave shopping is the relationship between capacity, measured in cubic feet, and exterior size. Capacity refers to the interior volume of the cooking cavity, not the outside dimensions. Two microwaves with the same capacity can have very different exterior footprints depending on wall thickness, insulation, and design.

For example, a 0.7 cubic foot microwave from one brand might measure 17 inches wide, while another brand’s 0.7 cubic foot model measures 19 inches wide. The interior capacity is the same, but the exterior size differs due to thicker walls or a larger control panel.

This matters because you might find a microwave with a slightly larger capacity that actually fits in a smaller space, or vice versa. Always prioritize exterior dimensions when space is tight, and use capacity as a secondary filter to ensure the interior meets your cooking needs.

Also note that capacity is not always a perfect indicator of usable space. A microwave with a 0.6 cubic foot capacity but a well-designed interior with a large turntable may be more practical than one with 0.7 cubic feet but a cramped, awkward cavity.

Small Microwave Comparison Table

The table below compares common small microwave categories to help you visualize the differences in size, capacity, wattage, and best use case.

Best Uses for the Smallest Microwaves

The smallest microwaves excel in specific scenarios. Understanding where they shine helps you decide if one is right for you.

Dorm rooms and student housing: Compact microwaves are a staple in college dorms. They fit on small desks or shelves and handle reheating leftovers, making popcorn, and warming beverages.

Studio and micro apartments: When counter space is at a premium, a compact microwave can sit on a shelf or in a corner without dominating the kitchen.

Office break rooms: Small microwaves are perfect for heating lunches without taking up valuable counter space in a shared kitchen.

RVs and campers: Portable mini microwaves designed for 12-volt or low-wattage use are ideal for life on the road.

Boats and marine use: Compact, low-power models work well in galleys where space and power are limited. (See Also:How Long To Microwave Salmon)

Secondary heating station: Some homeowners keep a small microwave in a basement, garage, or workshop for convenience without investing in a full-size unit.

Senior living and assisted care: A small, simple microwave with easy-to-read controls can be ideal for older adults who need basic reheating functions.

Tips and Best Practices

Getting the most out of a small microwave requires a few smart habits. These tips will help you maximize performance and longevity.

• Allow proper ventilation: Leave at least one inch of space on all sides and the back. Never block the vents.
• Use microwave-safe containers: Small microwaves heat intensely in a small space, so always use containers labeled microwave-safe to avoid melting or chemical leaching.
• Stir and rotate food: Lower wattage means less even heating. Stir food halfway through and rotate the dish if your model lacks a turntable.
• Clean regularly: Small cavities get dirty quickly. Wipe spills immediately to prevent odors and maintain performance.
• Do not overload: Leave space around food for air circulation. Overcrowding leads to uneven heating and longer cook times.
• Use the right power level: Many small microwaves default to high power. Use lower settings for delicate foods to avoid overcooking.
• Check the door seal: A poor seal reduces efficiency and can be a safety issue. Inspect the door gasket periodically.
• Position for easy access: Place the microwave at a comfortable height to avoid straining when retrieving hot food.

Common Mistakes to Avoid

Even experienced shoppers make errors when buying small microwaves. Here are the most common mistakes and how to avoid them.

Measuring only the counter, not the space above: Many people measure width and depth but forget height. Upper cabinets can prevent a microwave from fitting even if the footprint is fine.

Ignoring the handle: The handle adds one to two inches to the depth. If your counter is shallow, the door may not open fully or the unit may hang over the edge.

Assuming capacity equals usability: A 0.7 cubic foot microwave with a small turntable may be less practical than a 0.6 cubic foot model with a larger turntable. Always check turntable diameter.

Buying too little wattage: A 600-watt microwave will heat food, but slowly. If you use your microwave daily, spending a little more for 800 watts will save time and frustration.

Overlooking ventilation requirements: Placing a microwave flush against a wall or in an enclosed cabinet can cause overheating and shorten the appliance’s life.

Forgetting about the door swing: In tight spaces, the door may hit a wall or cabinet when opened. Check the swing radius before placing the unit.

Choosing style over function: A sleek mini microwave might look great but lack the power or capacity you need. Prioritize function first.

Frequently Asked Questions

What is the absolute smallest microwave available?

The smallest functional microwaves available to consumers are portable mini models with capacities around 0.3 to 0.5 cubic feet and exterior dimensions as small as 12 by 11 by 9 inches. However, these are best for light reheating and travel. For everyday use, the practical smallest size is a compact countertop model at 0.5 to 0.7 cubic feet. (See Also:How To Microwave Oatmeal With Water)

Can the smallest microwave fit a dinner plate?

Most compact microwaves with 0.5 cubic feet or more of capacity can fit a standard 10 to 10.5 inch dinner plate on the turntable. Always check the turntable diameter in the specifications, as this is the true limiting factor, not just the cavity size.

How many watts should a small microwave have?

For a small microwave, aim for at least 700 watts for reasonable heating speed. Models below 600 watts are noticeably slower and may not heat food evenly. The sweet spot for compact models is 700 to 800 watts.

Is a compact microwave enough for an apartment?

For most single people or couples in small apartments, a compact microwave of 0.7 to 0.9 cubic feet is sufficient for reheating, defrosting, and simple cooking. If you cook large meals or use oversized dishes, consider a small countertop model instead.

What is the best smallest microwave for an RV?

For RV use, look for a compact microwave specifically rated for mobile use, with a capacity around 0.5 to 0.7 cubic feet and wattage between 600 and 800. Ensure it can run on your RV’s power system, and consider a model with a secure door latch to prevent opening during travel.

How much clearance does a small microwave need?

Most small microwaves need at least one inch of clearance on the sides and back, and several inches above. Always check the manufacturer’s specifications, as requirements vary by model and inadequate clearance can cause overheating.

How much does the smallest microwave cost?

Compact microwaves typically range from 50 to 120 dollars depending on brand, features, and wattage. Portable mini models can be found for as little as 30 to 50 dollars, while premium compact models with inverter technology or sensor cooking may cost 120 to 180 dollars.

Conclusion

Understanding what is smallest microwave size comes down to balancing space constraints with real cooking needs. The smallest practical microwaves for everyday use are compact countertop models with 0.5 to 0.7 cubic feet of capacity, exterior dimensions around 15 by 12 by 10 inches, and wattages between 700 and 800. Smaller portable units exist for travel and RV use but sacrifice power and capacity.

By measuring your space carefully, checking turntable diameter against your largest dish, and choosing adequate wattage, you can find a small microwave that fits perfectly and performs reliably. Avoid common mistakes like ignoring ventilation and handle depth, and follow the step-by-step sizing guide in this article to make a confident purchase.

Whether you are outfitting a dorm room, a tiny apartment, or an RV, the right small microwave can deliver big convenience in a compact package. Take your measurements, set your priorities, and choose a model that matches both your space and your lifestyle.