Compact Countertop Microwaves for Tight Kitchens: Measure the Niche Before Choosing

Quick answer: the niche—not the capacity label—makes the first cut

The expensive mistake is measuring the empty counter, buying a microwave that technically fits, and then discovering that the door, plug, or ventilation requirement makes the location unusable. For a fixed niche, no model here is ready for purchase based on cabinet dimensions alone. The exact-model sources reviewed do not provide a complete set of manufacturer-required ventilation clearances or open-door dimensions for any of the three microwaves.

If your niche can accommodate the closed cabinet plus separately confirmed ventilation and access space, the Toshiba ML-EM09PA(BS) is the capacity-and-output choice: its exact Amazon catalog page lists 0.9 cu. ft., 900W, and a cabinet measuring 18.7 inches wide, 13.3 inches deep, and 10.7 inches high. That choice flips when the extra width is unacceptable or when you do not need the larger capacity and higher rated output.

The BLACK+DECKER EM720CB7 has the clearest documented access distinction. Its exact Amazon listing specifies a push-button door release, a 17.3-inch-wide, 13-inch-deep, 10.2-inch-high cabinet, 0.7-cu.-ft. capacity, and 700W output. Choose it when the push-button release and stainless-steel appearance are requirements, not merely preferences.

The COMFEE CMO-C20M1WB is the other 0.7-cu.-ft., 700W option. COMFEE’s exact official page documents digital controls, an interior light, six one-touch food programs, a removable 10-inch turntable, a two-step child door lock, and a published dimension string of 12.5 by 17 by 10 inches. The page does not label those three axes in its text, so do not assign them to depth, width, and height without checking the manual or obtaining clarification from COMFEE. That evidence limitation matters in a niche where an inch in the wrong direction can disqualify the appliance.

Resolve clearance and access before comparing features

Closed dimensions answer only whether the unplugged appliance cabinet can occupy a rectangular volume. Operating space is different: it includes the room needed to open the door, reach the release or handle, load a dish without hitting a wall, and use the controls. Manufacturer-required clearance is different again. It protects the intake and outlet areas and must come from the exact model’s instructions rather than from a generic microwave rule.

The exact Toshiba Amazon catalog page gives cabinet dimensions but no ventilation-clearance figure or open-door depth. The Toshiba manufacturer URL supplied with this job currently identifies ML4-EM09PA(BS), not the requested ML-EM09PA(BS). Its specifications therefore cannot be silently transferred to this ASIN. A different Toshiba manual found during research also belongs to a different model designation, so its installation numbers are not used here.

COMFEE’s exact product page provides a dimension triplet but does not label the axes in the accessible specification text. It also does not state open-door depth or required ventilation clearance there. The linked manual should be checked against the model number before purchase, especially if the microwave will sit under a low upper cabinet or between side panels.

The BLACK+DECKER listing labels its closed dimensions, but it does not publish a required clearance or open-door measurement. The push-button release explains how the latch is operated; it does not prove that the door clears a side wall or that the control can be reached in a narrow recess. A niche that is exactly 17.3 inches wide is therefore not a documented fit for a 17.3-inch-wide appliance.

• Closed size: the appliance body with the door shut.
• Operating space: room for the door, hands, dishes, controls, and cord during normal use.
• Required clearance: manufacturer-specified open space around vents; unavailable for these exact models in the reviewed evidence.
• Access path: the route from delivery entrance to counter, including turns, doorways, and lifting space.
• Cleanup burden: room to remove and wash the turntable and wipe the cavity; this is not included in cabinet dimensions.
• Storage burden: not applicable if the microwave remains installed, but a stored appliance still needs a safe lifting and carrying route.

Use this niche worksheet before a product enters the cart

Measure the actual location at its narrowest points. Backsplashes, face frames, trim, uneven walls, outlet covers, and cabinet lips can make the usable opening smaller than the nominal counter dimensions. Record the measurements rather than relying on a floor plan.

First write down usable width, usable counter depth, and vertical space. Then locate the outlet and note whether the plug or cord would occupy space behind the microwave. Do not subtract an estimated cord allowance; the required cord route and rear clearance need exact-model confirmation.

Next, mark the door’s travel area on the counter with painter’s tape. Because none of the reviewed sources provides a complete open-door depth, treat this measurement as unresolved until the manual or manufacturer supplies it. Also check whether a left-side wall, refrigerator panel, or shelf edge could block the door or your hand.

Finally, add the exact manufacturer clearance to each side of the closed cabinet rather than treating clearance as part of the cabinet measurement. If the clearance remains unknown, mark the candidate “not cleared for this niche.” That is the worksheet’s stop condition, not an invitation to use a typical number.

• Usable niche width: ____ inches
• Usable counter depth before the front edge: ____ inches
• Usable height below the upper cabinet: ____ inches
• Outlet and plug position verified: yes / no
• Exact-model side, rear, and top clearances documented: yes / no
• Door opens fully without striking an obstacle: yes / no / unresolved

Where the three choices actually separate

Capacity is useful only after the installation passes. The Toshiba is the sole 0.9-cu.-ft. model in this set and the sole 900W model. The two 0.7-cu.-ft. candidates are rated at 700W. Those are meaningful specification differences, but they do not establish real-world speed, evenness, noise, or dish compatibility. No standardized hands-on cooking test was supplied or performed for this guide.

For cabinet footprint, the labeled evidence places the Toshiba at 18.7 inches wide by 13.3 inches deep by 10.7 inches high and the BLACK+DECKER at 17.3 by 13 by 10.2 inches. The BLACK+DECKER therefore has the smaller documented closed cabinet on all three labeled axes. COMFEE publishes 12.5 by 17 by 10 inches, but the accessible official text does not assign those values to axes. Its precise width-versus-depth comparison remains unverified.

Controls and access create a different split. Toshiba’s exact listing documents a two-step child lock. COMFEE’s official page documents digital controls, an interior light, and a two-step child door lock. BLACK+DECKER’s listing documents a push-button door release, an LED display, ten power settings, six preset food buttons, an interior light, a child lock, and a removable 10-inch turntable. These control differences can decide between otherwise similar 0.7-cu.-ft. options, but only after physical fit.

Electrical compatibility also needs an exact check. COMFEE’s official page lists 110V. The BLACK+DECKER listing lists 110V and a rated microwave input of 1050W alongside its 700W cooking-output claim. The reviewed Toshiba listing did not provide a voltage in its accessible specifications. Confirm the rating label, outlet, grounding instructions, and circuit requirements before installation; output wattage is not a substitute for electrical input information.

Conditional verdicts and purchase checks

Choose the Toshiba ML-EM09PA(BS) only if the measured location accepts its documented 18.7-by-13.3-by-10.7-inch closed cabinet and the exact instructions later confirm adequate ventilation and door access. Its distinct reason is the combination of 0.9-cu.-ft. capacity and 900W output. Rule it out when minimum cabinet width matters, when 0.7 cu. ft. is sufficient, or when exact-model clearance remains unresolved. In that case, investigate the smaller documented BLACK+DECKER cabinet or consider no microwave until the niche can be changed.

Choose the COMFEE CMO-C20M1WB when you want a 0.7-cu.-ft., 700W model with digital controls, a two-step child door lock, and a removable 10-inch turntable—and only after confirming which axis corresponds to each published dimension. Its distinct choice reason is that exact combination of compact capacity, digital controls, and documented child-door mechanism. Rule it out when the unlabeled dimension order prevents a confident niche check or when 900W and 0.9 cu. ft. are required. The Toshiba is the adjacent capacity category; no purchase is the safer fit answer until COMFEE’s axes and clearances are confirmed.

Choose the BLACK+DECKER EM720CB7 when a labeled 17.3-by-13-by-10.2-inch cabinet, push-button door release, and stainless-steel finish match your requirements. Its distinct reason is the documented push-button access rather than a capacity or output advantage over COMFEE. Rule it out if the button or door cannot be reached comfortably, if 0.7 cu. ft. is too small, or if manufacturer clearance cannot be verified. Toshiba is the larger-capacity alternative; a freestanding microwave cart is an adjacent placement solution when the fixed niche lacks ventilation.

What remains unverified—and what to do next

This comparison uses official specification evidence and exact Amazon catalog data, not hands-on testing. It does not establish heating speed, cooking evenness, noise, long-term durability, or whether a particular plate, bowl, or food package fits. Capacity in cubic feet does not document every usable cavity dimension.

Required ventilation clearance and full open-door depth remain unresolved for all three exact models in the evidence reviewed. COMFEE’s accessible specification also leaves the dimension order unlabeled, while Toshiba’s supplied manufacturer page currently points to a model designation that differs from the requested product. These are fit limitations, not minor footnotes.

The next decision is therefore simple: complete the worksheet with an exact-model manual or written manufacturer response. If the appliance plus every required clearance does not fit inside the measured location, reject it. If the cabinet fits but the door, plug, removable turntable, or cleaning access does not, reject it again. A microwave cart, open counter location, or no-purchase decision is better than forcing a countertop microwave into an undocumented enclosure.

Real models to compare against the decision

These are reference models, not universal winners or a ranked list. Each exact listing is paired with source evidence; your use case and constraints still decide whether it belongs on the shortlist. Rule-out checks identify unresolved facts or incompatible conditions instead of inventing generic cons.

Closed-size figures do not include drawer, lid, cup, or hand movement. “Not published” is a verify-before-buying flag, not an estimate.

Before-you-buy checklist

1. Confirm that the model number on the manual and rating label exactly matches the model being purchased.
2. Measure usable width, depth, and height at the niche’s narrowest points.
3. Add manufacturer-required side, rear, and top clearance separately from cabinet dimensions.
4. Verify full door travel and comfortable access to the handle or push-button release.
5. Check that the plug and cord can reach the outlet without consuming undocumented rear space.
6. Confirm the outlet voltage, grounding instructions, and circuit requirements from the exact manual or rating label.
7. Measure the dishes you actually use; cubic-foot capacity does not prove dish compatibility.
8. Leave enough access to remove the turntable and wipe the interior safely after use and cooling as directed by the manual or maker support guidance.

Sources and verification

Sources support the measurement method and examples above. Product-specific recommendations require a current manufacturer page or manual for that exact model.

• TOSHIBA 0.9 cu. ft. microwave page—currently identifies ML4-EM09PA(BS)TOSHIBA
• TOSHIBA ML-EM09PA(BS) exact Amazon catalog pageAmazon catalog / TOSHIBA listing
• COMFEE CMO-C20M1WB official product pageCOMFEE
• COMFEE CMO-C20M1WB exact Amazon catalog pageAmazon catalog / COMFEE listing
• BLACK+DECKER EM720CB7 exact brand-store specification listingBLACK+DECKER Store on Amazon
• BLACK+DECKER EM720CB7 manufacturer instruction manualBLACK+DECKER / Midea America
• TOSHIBA Microwave Oven, 0.9 Cu.Ft, 900W, Black Stainless SteelAmazon verified affiliate listing
• COMFEE' Countertop Microwave Oven 0.7 Cu.Ft, 700W, Black, Child LockAmazon verified affiliate listing
• BLACK+DECKER Countertop Microwave Oven, 0.7 Cu.Ft, 700W, Stainless SteelAmazon verified affiliate listing