| Quick Facts | |
|---|---|
| Typical reheating wattage | 700 to 800 watts |
| Typical full-cooking wattage | 1000 to 1250 watts |
| Countertop capacity range | about 0.7 to 1.6 cubic feet |
| Standard drawer microwave capacity | around 1.2 cubic feet |
| Common drawer cutout widths | 24 inches or 30 inches |
| Federal radiation leakage limit | 5 milliwatts per square centimeter at 5 cm from the surface (21 CFR 1030.10) |
| Minimum recommended standing time | at least a two-minute stand time after cooking, per USDA FSIS |
How to choose a microwave: start with wattage, not the preset count
Wattage output ranges from around 700W in compact models up to 1250W in larger inverter units, and it's the single biggest factor in how fast and evenly food cooks.
Shopping for a specific model? See our full microwaves roundup — 10 models compared on the specs that decide it.
A 700-watt microwave is fine for a mug of coffee or a bowl of soup, and it's what you'll find in the smallest countertop units built for dorms and break rooms. Push past a single serving, though, and the gap shows up fast: a 1000W unit clears a full dinner plate in noticeably less time, and several higher-end countertop models push output to 1250W for even quicker recovery between cook cycles.
The catch is that wattage alone doesn't guarantee even heating. Some manufacturers publish a second, higher input-wattage figure alongside the actual cooking output, so it's worth checking which number a listing is actually quoting before assuming a model runs hotter than it does. If your household reheats more than it cooks from scratch, 700 to 800W is genuinely enough; if you're microwaving full meals or defrosting proteins regularly, look toward 1000W and up. Wattage is the first filter to apply, since it rules out entire categories of unit before you even look at features. Our full microwaves hub sorts models by wattage tier if you want to browse by that number directly.
Size the capacity to your counter and your cookware
Countertop microwaves in this category span roughly 0.7 to 1.6 cubic feet; measure your largest regular dish and your available counter space before picking a capacity.
A 0.7 cubic foot microwave is a tight box built for apartments, dorms, and offices where counter space is the scarce resource, and it comfortably handles a mug or a single plate. Step up to 1.1 or 1.2 cubic feet and you gain enough room for a casserole dish or a dinner plate with sides, which is the size range most full-size kitchens land on. A handful of larger countertop models stretch to around 1.6 cubic feet for bigger households or anyone who reheats large portions at once.
Don't just measure the box footprint, either. Check the interior cavity dimensions against your actual bakeware and serving dishes, since a wide but shallow interior won't necessarily fit a tall casserole even if the cubic-footage number looks generous. If your kitchen is genuinely tight on counter space, our small microwave guide narrows the field to compact models that don't sacrifice much cooking capability for their smaller footprint. Getting the capacity right is half the work of ending up with a unit that actually earns its counter space instead of just filling it.
Pick a mounting format: countertop, drawer, or built-in
Countertop units need only an outlet and clear space, while drawer and built-in microwaves require a specific cutout width and professional-grade measuring before you buy.
Most people default to a countertop microwave because it needs nothing more than an outlet and a few square feet of clearance, and it's the easiest format to replace later. Drawer microwaves solve a different problem: they slide out from under a counter or inside an island, which frees up counter and wall space entirely but requires a dedicated cutout, typically sized for either a 24-inch or 30-inch cabinet opening. Interior capacity across drawer models is fairly standardized at around 1.2 cubic feet, so the real differences come down to how the drawer opens (fully automatic versus one-touch with a slow-close mechanism), where the control panel sits, and the exact cutout and cavity dimensions the manufacturer publishes.
Over-the-range and built-in wall units are their own category again, mounting into existing cabinetry or replacing a range hood, and they're the least forgiving to get wrong since a mismeasured cutout means an expensive return. If a drawer format fits your kitchen layout, our drawer microwave guide breaks down mounting styles and published cutout specs side by side so you're not left guessing at install time. Mounting format is the one decision in this whole process you genuinely cannot undo after installation, so it deserves more time than the wattage debate.
Decide if you need convection, air fry, or just microwave heat
A standard microwave only uses microwave radiation to heat food; convection and air-fry combo units add a heating element and fan that let them brown, crisp, and roast as well.
A plain microwave heats by exciting water molecules in food, which reheats and cooks quickly but never browns or crisps anything, no matter how long you run it. Convection microwaves add a heating element and a fan that circulates hot air, which lets the same appliance roast a chicken or crisp reheated fries the way a real oven would. Some combo units go further, layering in dedicated air-fry presets and a broil function, effectively replacing a second small appliance if you have the counter space to spare.
That versatility comes at a real cost in both price tier and complexity: a combo unit has more parts that can wear out and a steeper learning curve than a microwave that only microwaves. If you already own a toaster oven or air fryer, a plain microwave may cover everything you actually need. If you're trying to consolidate appliances on a small counter, our convection microwave guide compares which combo models are worth the added footprint and price tier. This is usually the point where people who set out to buy a simple microwave end up with a small oven instead, which is fine as long as it's a deliberate trade rather than an accident.
Look for real even-heating features, not just a turntable
A turntable is the baseline for even heating; sensor cooking and inverter-style continuous power go further by adjusting time and power automatically based on the food itself.
Nearly every microwave includes a rotating glass turntable, and it matters more than it sounds: without one, food near the cavity walls cooks faster than food in the center, leaving cold spots. Beyond the turntable, some models add a humidity sensor that reads moisture released during cooking and adjusts time and power automatically, which takes the guesswork out of reheating mixed leftovers. Inverter-style designs deliver a continuous stream of power instead of cycling the magnetron on and off at full strength, which is the mechanism behind smoother defrosting and gentler simmering settings on higher-end units.
USDA's Food Safety and Inspection Service recommends stirring, rotating, or turning food over partway through cooking specifically because microwaves heat unevenly by nature, and that guidance holds even on a microwave with sensor cooking. None of these features replace basic practice: always use microwave-safe cookware, since containers not rated for microwave use can warp, melt, or leach chemicals into food, and let food sit for the standing time listed on the package or at least a few minutes after cooking, since dense foods keep cooking internally even after the microwave shuts off.
Check the safety and convenience basics before you buy
Every microwave sold in the US must meet an FDA radiation leakage limit, and features like a child safety lock or a mute button are worth confirming on the specific model rather than assumed.
Radiation leakage isn't something to shop around on: federal regulation 21 CFR 1030.10 caps microwave radiation leakage at 5 milliwatts per square centimeter measured 5 centimeters or more from the oven's surface, and every unit legally sold in the US has to pass that limit along with requiring at least two independent safety interlocks that cut power the instant the door opens. That baseline is identical on the cheapest countertop box and on a premium drawer unit, so it's not a spec worth paying extra for.
What does vary by model is the convenience layer on top: a child safety lock built into the door handle or control panel, a mute or sound-off button for late-night reheats, and defrost settings that work by weight or by time rather than a single generic setting. If a specific brand's ecosystem or reliability track record matters to you, our Panasonic microwave guide walks through that manufacturer's inverter and sensor lineup specifically, and our best microwave guide rounds up the strongest overall picks across price tiers once you've settled on the format and capacity that fit your kitchen.