Buying a Microwave Guide | Choose the Right Fit First

The right microwave starts with measuring your space and picking the type that matches your kitchen, then comparing wattage, capacity, and essential features.

Microwave shopping looks simple until a box arrives that doesn’t fit the cabinet or cooks unevenly because the wattage was too low. The fix is straightforward: match the microwave to your kitchen layout and cooking habits before you compare prices or brands. Here’s what actually matters when you’re buying.

Step One: Measure Your Space Before Anything Else

The single most common mistake in buying a microwave is skipping the measuring tape. External dimensions vary more than you’d expect, and a quarter-inch difference can turn a perfect fit into a return headache.

Measure the width, height, and depth of the spot where the microwave will sit. For countertop models, also check counter depth and leave at least two inches of clearance around the unit for airflow. For built-in cabinets, follow the manufacturer’s exact cutout dimensions — standard cabinets don’t guarantee standard fits. Bring a dinner plate or your most-used casserole dish to the store or check it against the interior dimensions listed online; advertised capacity alone doesn’t tell you whether your favorite bowl fits the turntable or the cavity height.

If you already know your budget and want tested picks, our tested budget microwave roundup compares models that balance size, wattage, and price.

Pick the Right Type for Your Kitchen

Your kitchen layout decides which microwave type you should buy, not the other way around. Countertop, over-the-range, built-in, and drawer models all serve different installation realities.

• Countertop microwaves — The most common and usually the most affordable type. These sit on an open counter and come in the widest size and wattage range. They’re the easiest to install and replace, which makes them the default for most households.
• Over-the-range (OTR) microwaves — Mounted above the stove, these combine cooking with a vent hood. They save counter space but require confirming the ventilation setup, safe clearance above the cooktop, and that the mounting hardware fits your cabinets. Most OTR models cost $200 or more, with tested units often exceeding $400.
• Built-in microwaves — Designed to fit flush into cabinetry for a seamless look. They require precise cabinet sizing and often professional installation. Prices typically start around $400 and can exceed $1,000.
• Drawer microwaves — Pull out like a drawer and are installed below counter level. These work well for low-counter kitchens or islands but come at a premium and need careful clearance planning.

Match Wattage and Capacity to How You Cook

Microwave wattage generally falls between 700 and 1,200 watts, and this number directly controls how fast and evenly your food heats. Lower-wattage units (600–800 W) handle leftovers, popcorn, and reheated coffee fine. The sweet spot for most cooks is 1,000 watts — it handles standard recipes and frozen dinners without requiring you to relearn cooking times. If you regularly cook larger family meals or thick casseroles, look at 1,100 to 1,200 watts.

Capacity follows the same logic: a 0.7 to 1.0 cubic foot model fits a single person or dorm room. Most couples and small households do well with 1.1 to 1.5 cubic feet. Larger families or anyone who heats big casserole dishes should look at 1.6 cubic feet and up. But interior capacity alone doesn’t guarantee a plate fits — always confirm turntable diameter and cavity depth.

Features That Matter and Mistakes That Cost You

A few features make a real daily difference. Child lockout is essential if you have young children in the house. Stainless steel interiors are noticeably easier to wipe clean than painted finishes. For any type, check door swing clearance — some models open wide and block neighboring counters.

For over-the-range models, ventilation (measured in CFM) and the safe clearance distance above your cooktop are non-negotiable checks before you buy. Auto-shutoff is a safety feature worth confirming on any model.

The two biggest buying mistakes are shopping by price before measuring your space, and forgetting that external size and internal capacity are different numbers. A microwave that’s “1.7 cubic feet” on the box may not fit the same footprint as another 1.7 cubic foot model because external dimensions vary between brands.

Key Microwave Specs at a Glance