How to Choose a 24 Inch Built-In Microwave
The best 24 inch built in microwave is one whose appliance dimensions and approved installation method match your measured cabinet opening. Check the model's cutout width, height and depth, then confirm whether it needs a specific trim kit or another built-in option.
On this page (9 sections)
- What does “24 inch built-in microwave” mean?
- How do you measure a cabinet opening for a 24 inch microwave?
- Does a 24 inch microwave need a trim kit?
- Which built-in installation options should you compare?
- Which features matter after fit is confirmed?
- Should you choose a 24 inch microwave with a built-in trim kit?
- What should you confirm before ordering?
- How do you choose the best 24 inch built in microwave?
- Frequently asked questions
The best 24 inch built in microwave is one whose appliance dimensions and approved installation method match your measured cabinet opening. Check cutout width, height and depth, then confirm whether the model requires a specific trim kit.
A microwave described as 24 inches wide may not need a 24 inch opening. The appliance body, trim frame and cabinet cutout are separate measurements, so match the model's installation instructions to your cabinet before choosing.
For other sizes, compare our best 30 inch microwave built in options or read the 24 inch microwave oven combo guide if you want an oven and microwave in one appliance.
What does “24 inch built-in microwave” mean?
A 24 inch built-in microwave is a model intended for a built-in installation around that nominal width. The label alone does not tell you the exact appliance width or cabinet cutout size.
Manufacturers may use nominal widths to group appliances, while the actual cabinet dimensions include a specific width, height and depth. A trim kit may cover the gap around an appliance, but it does not make every microwave fit every opening.
Before shopping, note three dimensions separately:
| Measurement | What it describes | Why it matters |
|---|---|---|
| Appliance width | The microwave's outside width | It must fit within the available cabinet space |
| Cutout width | The opening specified for installation | It determines whether the cabinet opening is suitable |
| Trim kit size | The frame approved for that microwave | It may define the finished opening and installation method |
Use the model's installation guide for final fit requirements. Leave room for any required ventilation clearances and follow the maker's electrical and mounting instructions.
How do you measure a cabinet opening for a 24 inch microwave?
Measure the opening's inside width, height and depth, then compare each value with the microwave's specified cutout dimensions. One matching width is not enough to confirm fit.
Take width measurements near the top, center and bottom of the opening. Measure height on the left, middle and right, and use the smallest measurement if the cabinet sides or top are uneven.
Measure depth from the front edge to the back wall, while accounting for any plug, outlet or obstruction behind the appliance. Check whether the installation instructions require a rear clearance or a particular outlet location.
Also measure the path from the delivery point to the cabinet. Doorways, turns and nearby cabinet doors can make moving a wide appliance difficult even when the cutout itself is large enough.
Write down your measurements and compare them with the installation guide for the exact model and trim kit. If any measurement is close, ask the manufacturer or installer to confirm fit before ordering.
How is appliance width different from cutout width?
Appliance width is the outside measurement of the microwave body, while cutout width is the cabinet opening needed for installation. A nominal 24 inch model can have an appliance width that is not exactly 24 inches.
For example, the Frigidaire Gallery GMBS3068BF has a listed appliance width of 24 7/16 inches and a cutout width of 24 3/4 inches. Its cutout depth is 20 inches and cutout height is 16 3/4 inches, so width alone cannot guarantee fit.
These dimensions illustrate why you should check the model's required opening rather than assume the number in its name is the cabinet size. Use the installation instructions for all three cutout dimensions.
Does a 24 inch microwave need a trim kit?
Some built-in microwaves require a model-specific trim kit, while others use a different approved built-in arrangement. Confirm the required kit and its compatible microwave model before buying either item.
A trim kit fills and finishes the space around a compatible microwave. It does not change the appliance's exterior dimensions or make an unapproved microwave safe for a built-in cabinet.
Check whether the trim kit is included or sold separately, and confirm its exact part number. The Frigidaire GMBS3068BF has compatible 27 inch and 30 inch trim kits available separately, which is a reminder that an appliance width around 24 inches does not automatically mean it takes a 24 inch kit.
For a clearer explanation of how a frame differs by installation style, see what a trim kit for an over-the-range microwave does. Over-the-range trim kits and built-in trim kits serve different installation types, so don't treat them as interchangeable.
Which built-in installation options should you compare?
Choose only an installation method approved for the exact microwave model. A countertop microwave, built-in microwave and microwave drawer can have different mounting, trim and clearance requirements.
A standard built-in microwave may sit in a cabinet opening with a matching trim frame. For a shorter range-mounted design, compare low-profile over-the-range microwaves.
A microwave drawer installs lower in the cabinetry and opens differently, while an over-the-range model mounts above a cooking surface and may include a vent.
If your cabinet opening is not a good match, compare nearby configurations instead of forcing an appliance into place. A 1.6 cu ft built in microwave can help you compare capacity and installation choices, while a black stainless built in microwave guide may help if finish is part of your decision.
Over-the-range models have their own width and mounting needs. Our guide answers whether over-the-range microwaves come in 24 inch width.
Which features matter after fit is confirmed?
Once the dimensions and installation method work, compare capacity, controls and cooking functions against your routine. Fit comes first because useful features do not solve an incompatible cabinet opening.
Capacity helps you judge the interior space for plates and dishes, but it does not replace the exterior measurements. Look at the turntable or cooking area dimensions when you need to fit a particular dish.
Sensor cooking can adjust cooking time and power for supported foods. If you want more than microwave heating, check whether the model includes convection, air frying or broiling, and confirm how those modes affect installation and electrical requirements.
A combo model may take a different amount of cabinet space or need a different circuit.
Compare the built in microwave air fryer combo guide and the best microwave air fryer combo options if those cooking modes are priorities. For a simpler microwave, compare power needs in our best 1000 watt microwave guide.
Frigidaire Gallery GMBS3068BF: a near-24-inch body with separate trim kits
The Frigidaire Gallery GMBS3068BF suits a buyer who has confirmed its specific cutout dimensions and trim option. Its body is 24 7/16 inches wide, with a specified cutout of 24 3/4 inches wide, 20 inches deep and 16 3/4 inches high.
It offers 2.2 cu. ft. of cooking space, sensor cook and reheat, and 11 power levels. Check that the separate trim kit and cabinet cutout match your plan before choosing it.
AAOBOSI 30 Inch Built-in Microwave Oven Air: a larger format combo
The AAOBOSI is for a buyer considering a larger built-in format with several cooking modes. Its stated exterior width is 29.82 inches, so it is not a 24 inch microwave for a 24 inch opening.
It has 1000 watts of microwave power, a 1750 watt broil element and a 1700 watt convection element. Its instructions call for a 20A plug, so confirm electrical compatibility and available cabinet space before choosing it.
COSMO Haven Coll: a 30 inch microwave drawer
The COSMO Haven Coll is a built-in drawer option for a buyer planning a wider cabinet installation. Its exterior width is 29.9 inches, so compare it with a 30 inch opening plan rather than a 24 inch one.
The drawer has melt, soften, popcorn and beverage presets, plus weight or timed defrost. Its 29.9 inch width and 23.2 inch depth make exact cabinet measurements essential.
Should you choose a 24 inch microwave with a built-in trim kit?
Choose a 24 inch microwave with a built-in trim kit only when the trim kit is approved for that model and your cabinet opening matches its installation dimensions. The microwave body, kit and cutout must work together.
Check the trim kit model number, the microwave model numbers it supports, the finished front dimensions and the cutout requirements. If the maker offers multiple kit sizes, follow the instructions for the exact combination you intend to use.
Don't assume that a separately sold trim kit is optional for a built-in installation. The manual may require a specific kit to provide the intended fit and appearance.
A built-in microwave with trim kit 24 inch may refer to a microwave near 24 inches wide, a kit designed for a nominal 24 inch opening or a retailer's product grouping. Verify which meaning applies before comparing models.
What should you confirm before ordering?
Confirm dimensions, approved installation parts and electrical needs before placing an order. Keep the exact model and trim kit numbers together so you can check the complete installation plan.
Use this checklist:
- Measure the opening's width, height and depth at more than one point.
- Compare those measurements with the microwave's cutout requirements.
- Confirm the trim kit is approved for the exact microwave model.
- Check the cabinet depth, outlet location and required clearances.
- Verify the appliance can pass through the delivery route.
- Check the electrical requirements and have a qualified installer handle any needed wiring or cabinet changes.
If the manufacturer does not clearly identify an approved built-in installation for the microwave, choose a model with instructions that do. Do not rely on a trim frame alone to establish that a countertop model is suitable for a cabinet.
How do you choose the best 24 inch built in microwave?
Choose the best 24 inch built in microwave by matching the exact model's cutout dimensions and approved trim kit to your cabinet, then comparing capacity and cooking features. Pick the Frigidaire example if its specified 24 3/4 inch wide cutout, height, depth and separate trim option suit your opening.
If your cabinet is wider, compare a 30 inch built-in model or drawer. For a different kitchen layout, compare microwave drawer and countertop options.
If you want more cooking functions, check the combo's exterior dimensions and electrical needs before choosing it.
Frequently asked questions
Can a 24 inch microwave fit in a 24 inch cabinet?
Not necessarily. The nominal appliance size, exterior width and required cabinet cutout are different values.
Measure the opening and compare width, height and depth with the manufacturer's installation dimensions, including the approved trim kit requirements.
Can I install a countertop microwave with a trim kit?
Only if the manufacturer approves that exact microwave and kit for built-in use. A trim kit does not make an incompatible microwave suitable for a cabinet, so check the installation instructions for mounting, airflow and clearances.
Does a 24 inch microwave need a 24 inch trim kit?
No universal rule connects the nominal microwave width to the trim kit size. Check the approved kit part number for the exact microwave model, then use that combination's required cabinet cutout dimensions.
Is a 30 inch microwave too wide for a 24 inch opening?
A microwave with an exterior width near 30 inches will not fit within a 24 inch opening. Confirm the exact appliance width and cutout dimensions for any model before deciding whether it fits your cabinet.
Is a microwave drawer a built-in microwave?
Yes, a microwave drawer is a built-in style, but it has its own exterior dimensions and cabinet requirements. Check the width, depth, height and installation instructions, and consider whether the drawer opening works with the surrounding cabinets.
Pick a model only after its cutout, trim kit and electrical requirements match your kitchen. If you have a wider opening, compare the 24 inch microwave oven combo guide to see whether a combo design fits your cooking needs.
Frequently asked questions
Does a 24 inch microwave fit a 24 inch cabinet opening?
Not necessarily. Appliance width and cabinet cutout width are different measurements, and the trim kit can also affect the required opening.
Compare your measured opening with the model's approved cutout dimensions, including width, height and depth, before ordering.
Can I use a trim kit to make a countertop microwave built in?
Only if the microwave maker approves a trim kit for that exact model and installation. A trim kit is not a universal frame, and a microwave that is not approved for built-in use may lack the required installation clearances or airflow.
Is a 30 inch microwave too wide for a 24 inch opening?
A microwave with a 30 inch appliance width generally cannot fit within a 24 inch opening. Check the exact exterior width and cutout requirements for the model, since the nominal size alone does not confirm fit.
What should I measure before buying a built-in microwave?
Measure the cabinet opening's width, height and depth, then check the route to the kitchen and the surrounding clearance. Match those numbers to the model's cutout requirements and its approved trim kit or other built-in installation instructions.
Is a microwave drawer a 24 inch built-in microwave?
A microwave drawer is a built-in style, but its stated width may be larger than 24 inches. Check its actual exterior dimensions and cabinet cutout requirements, and compare the drawer's access and installation needs with a standard built-in microwave.
