Introduction
When shoppers ask, “How big is microwave?” they are usually looking for more than a single number. Microwave ovens come in a wide range of exterior dimensions, interior capacities, and installation styles, and the right choice depends on counter space, cooking habits, and kitchen layout. Understanding microwave size and dimensions helps you avoid buying an appliance that is too large for your counter or too small for your family’s needs.
This guide explains the most common microwave size categories, typical dimensions by type, how to measure your available space, and how to match capacity to your household. It also covers over-the-range models, built-in units, clearance requirements, and common mistakes to avoid before you buy.
- Common Microwave Size Categories
- Small / Compact Microwaves
- Midsize Microwaves
- Full-Size Microwaves
- Over-the-Range Microwaves
- Built-In Microwaves and Microwave Drawers
- How to Measure Your Space for a Microwave
- How to Measure a Microwave (Step-by-Step)
- Interior Capacity vs. Exterior Dimensions
- Choosing the Right Microwave Size for Your Needs
- Common Mistakes When Buying by Size
- Tips and Best Practices
- Frequently Asked Questions
- Conclusion
Common Microwave Size Categories
Most countertop microwaves fall into three general size groups based on interior capacity and overall footprint. While exact measurements vary by brand and model, these categories provide a reliable starting point when comparing appliances.
| Category | Typical Interior Capacity | Typical Exterior Width | Typical Exterior Depth | Typical Exterior Height |
|---|---|---|---|---|
| Small / Compact | 0.5 to 0.9 cubic feet | 17 to 20 inches | 12 to 16 inches | 10 to 14 inches |
| Midsize | 1.0 to 1.5 cubic feet | 20 to 24 inches | 15 to 18 inches | 12 to 16 inches |
| Full-Size | 1.6 to 2.2+ cubic feet | 24 to 30 inches | 18 to 20 inches | 14 to 18 inches |
| Over-the-Range | 1.7 to 2.1 cubic feet | 29 to 32 inches | 15 to 18 inches | 15 to 18 inches |
| Built-In / Drawer | 1.0 to 2.0 cubic feet | 24 to 30 inches | 20 to 25 inches | 14 to 18 inches |
These figures are averages. A compact microwave might work well in a dorm room or office, while a full-size model is better suited to a family kitchen where large casserole dishes and multiple servings are common.
Small / Compact Microwaves
Small microwaves typically offer between 0.5 and 0.9 cubic feet of interior space. Their exterior width usually ranges from 17 to 20 inches, making them ideal for small apartments, dorm rooms, break rooms, and countertops with limited room. Because the cavity is compact, these models are best for reheating beverages, cooking frozen meals, and preparing single portions. They generally cannot accommodate a standard 9-inch by 13-inch baking dish, so buyers should check interior dimensions before purchasing if they plan to cook larger items.
Midsize Microwaves
Midsize microwaves offer approximately 1.0 to 1.5 cubic feet of capacity. Exterior widths typically fall between 20 and 24 inches. This category strikes a balance between counter footprint and cooking versatility. A midsize model can usually fit a standard dinner plate, a medium casserole dish, or a small roasting pan. It is a popular choice for couples or small households that want more power and space than a compact unit provides without dedicating a large portion of the counter to the appliance.
Full-Size Microwaves
Full-size microwaves generally provide 1.6 cubic feet or more of interior capacity. Their exterior width often ranges from 24 to 30 inches, with depth around 18 to 20 inches and height from 14 to 18 inches. These models are designed for family kitchens and can accommodate large platters, multiple bowls, and tall containers. The tradeoff is a significant counter footprint, so buyers should verify that they have enough surface area and nearby electrical access before selecting a full-size unit.
Over-the-Range Microwaves
Over-the-range microwaves are installed above a cooktop and typically measure 29 to 32 inches wide to match standard cabinet widths. Their interior capacity usually ranges from 1.7 to 2.1 cubic feet. Because they combine microwave cooking with ventilation and lighting for the stove below, they save valuable counter space. However, installation is more complex than placing a countertop model, and the mounting height must allow safe access to the control panel while clearing the range beneath. Buyers should measure the distance from the cooktop to the upper cabinets to confirm that an over-the-range unit will fit.
Built-In Microwaves and Microwave Drawers
Built-in microwaves are designed to integrate with cabinetry, often appearing in a wall oven stack or beneath a counter. Microwave drawers open horizontally like a drawer and are typically installed at waist or chest height. Exterior widths for built-in models commonly range from 24 to 30 inches, while microwave drawers are usually around 24 to 30 inches wide as well. Interior capacities vary from 1.0 to 2.0 cubic feet depending on the model. These options create a seamless kitchen look but require precise cutout dimensions and professional installation in most cases. (See Also:Can You Paint Your Microwave)
How to Measure Your Space for a Microwave
Before purchasing a microwave, measure the area where it will sit or be installed. Start by measuring the width of the available counter or cabinet opening from side to side. Next, measure the depth from the back wall to the front edge of the counter, remembering to account for any backsplash or trim. Then measure the height from the counter surface to the underside of upper cabinets if applicable. It is also wise to leave a few inches of space on each side and behind the unit for ventilation and cord access. Record all measurements in inches and compare them to the manufacturer’s exterior dimensions before making a decision.
How to Measure a Microwave (Step-by-Step)
If you already own a microwave or are checking a model in a store, use this step-by-step process to capture accurate dimensions.
- Unplug the microwave and remove any items sitting on top of it or inside the cavity.
- Measure the width by placing a tape measure at the far left outer edge and extending it to the far right outer edge of the unit.
- Measure the depth from the back panel to the front of the door or handle, whichever extends farther outward.
- Measure the height from the bottom surface of the microwave to the top of the cabinet, including any feet or protruding vents.
- Open the door fully and measure the swing clearance to ensure there is enough room for the door to open without hitting a wall or cabinet.
- Write down each measurement in inches and centimeters, then compare them to your available space and required clearance.
Taking these measurements carefully prevents the common problem of bringing home a microwave that does not fit the intended location.
Interior Capacity vs. Exterior Dimensions
Interior capacity is measured in cubic feet and describes how much food the microwave can hold, while exterior dimensions describe how much counter or cabinet space the appliance occupies. A microwave with a large exterior does not always have a proportionally large interior, because thick walls, insulation, and internal components take up room. Conversely, some compact models use space efficiently and offer more usable capacity than their footprint suggests. When asking “How big is microwave?” it is important to consider both numbers: the exterior size for fit and the interior capacity for cooking performance.
Choosing the Right Microwave Size for Your Needs
The best microwave size depends on household size, cooking habits, and available kitchen space. A single person or student who mainly reheats coffee and leftovers will likely be satisfied with a compact model under 1.0 cubic feet. A couple or small family usually benefits from a midsize unit between 1.0 and 1.5 cubic feet. Larger households or people who frequently cook full meals in the microwave should look at full-size models with at least 1.6 cubic feet of capacity. If counter space is limited, an over-the-range or built-in model may be the better solution, provided the kitchen layout supports installation.
Common Mistakes When Buying by Size
One common mistake is measuring only the counter width and ignoring depth and height, which can result in a microwave that fits side-to-side but protrudes too far or blocks cabinet doors. Another error is assuming that a higher wattage always means a larger physical size; wattage relates to cooking power, not dimensions. Some buyers also forget to account for the power cord and ventilation gap, placing the microwave flush against a wall where it cannot dissipate heat properly. Finally, shoppers sometimes overlook door swing direction, purchasing a unit whose door opens into a tight corner or collides with adjacent cabinets.
Tips and Best Practices
Always check the manufacturer’s specifications rather than relying on general category averages, because dimensions can vary by an inch or more between brands. If you plan to cook with specific dishes, measure those dishes and compare them to the interior width and depth of the microwave. Leave at least three inches of clearance on the sides and back of a countertop model unless the manual states otherwise. For over-the-range units, verify that the bottom of the microwave sits at a safe and comfortable height above the cooktop. When in doubt, choose a slightly smaller model that fits comfortably over a larger one that crowds the workspace.
Frequently Asked Questions
How big is microwave on average?
The average countertop microwave is about 20 to 24 inches wide, 15 to 18 inches deep, and 12 to 16 inches tall, with an interior capacity of roughly 1.0 to 1.5 cubic feet. Exact dimensions vary by model and category. (See Also:Can You Put Eggs In Microwave)
What are the dimensions of a compact microwave?
A compact microwave usually measures between 17 and 20 inches wide, 12 to 16 inches deep, and 10 to 14 inches high. Interior capacity typically ranges from 0.5 to 0.9 cubic feet.
How big is an over-the-range microwave?
Over-the-range microwaves are generally 29 to 32 inches wide to match standard cabinet openings. Their height is typically 15 to 18 inches, and depth ranges from 15 to 18 inches, with interior capacity around 1.7 to 2.1 cubic feet.
What size is a built-in microwave?
Built-in microwaves commonly range from 24 to 30 inches wide and 14 to 18 inches high. Depth varies by design, often between 20 and 25 inches, and interior capacity usually falls between 1.0 and 2.0 cubic feet.
What does microwave capacity mean?
Microwave capacity refers to the interior volume measured in cubic feet. It indicates how much food or how many containers can fit inside, separate from the exterior dimensions that determine counter or cabinet fit.
How do I measure space for a microwave?
Measure the width, depth, and height of the intended location, including clearance for ventilation and the power cord. Compare those numbers to the microwave’s exterior dimensions before purchasing.
Can a full-size microwave fit a large casserole dish?
Most full-size microwaves with 1.6 cubic feet or more can accommodate a standard 9-inch by 13-inch casserole dish, but buyers should verify interior width and depth against their specific dish measurements. (See Also:Can You Steam Broccoli In A Microwave)
How much counter space does a microwave need?
A microwave needs enough counter space for its full width and depth, plus additional room on the sides and back for airflow. Many manufacturers recommend at least three inches of clearance on each side and behind the unit.
Conclusion
Understanding how big is microwave involves more than reading a single number on a box. Exterior dimensions determine whether the appliance fits your counter or cabinet opening, while interior capacity determines what you can cook inside it. Compact, midsize, full-size, over-the-range, and built-in models each serve different needs, and measuring your space carefully before buying saves time, money, and frustration. By matching the microwave size to your household habits and kitchen layout, you can choose an appliance that fits perfectly and performs well for years to come.