Over-the-Range Microwave Dimensions: Will It Fit?

On this page (11 sections)

1. What the three measurements mean
2. How wide are 30-inch over the range microwaves?
3. Does depth matter more than height?
4. Check the depth against the wall and the cabinet
5. Measure the opening in three places
6. Mounting height and the cooktop
7. Depth when the vent runs behind the unit
8. Common measuring mistakes
9. Over the range microwave dimensions checklist
10. What to do when the opening is wider than the unit
11. Will it fit? Check the dimensions before you order an over the range microwave

Over the range microwave dimensions decide most fit problems, and three measurements matter most: the width of the opening, the height from the cooktop to the cabinet, and the depth from the wall. Get all three before you compare any model.

Width is usually the easy one, because the 30-inch models we checked all measure about 29.9 inches wide. Depth and height are where the units differ, so they need the closer look.

What the three measurements mean

Width is the side-to-side space in the opening, and the unit has to fit inside it. Height is the space from the cooktop to the cabinet bottom, which sets how tall the unit can be.

Depth is how far the unit sits from the wall. It has to clear the back of the cabinet, and any vent connection behind the unit needs room too.

How wide are 30-inch over the range microwaves?

The 30-inch models we checked measure between 29.87 and 29.9 inches wide, so they fit the same width of opening. A fraction of an inch matters less than the real gap on each side of the cabinet.

Check the opening itself before you order, since a standard unit still needs a fit that works for your cabinet. The GE 1.6 cu ft is a useful size reference for a standard 30-inch opening.

Does depth matter more than height?

For most kitchens, depth is the measurement that causes trouble, because the unit has to fit between the cabinet front and the wall. Height matters more when the cabinet is short, and slim models solve that problem by giving up depth.

Slim units trade depth for height

Slim models are shorter but deeper. The Samsung slim we checked is 10.75 inches tall and 19.13 inches deep, so it can suit a short cabinet with room behind it.

Check the depth against the wall and the cabinet

Measure from the wall to the cabinet front, then compare that number with the unit's depth. Leave room for the vent connection and any cord behind the unit.

A deeper unit may sit too far forward on a standard cabinet, so check the depth before you order. Standard-depth units suit most cabinets, while the deeper slim models suit shorter openings with room behind.

Measure the opening in three places

Measure the width at the top, the middle and the bottom of the opening, then use the smallest number. Do the same for the height from the cooktop to the cabinet bottom, and for the depth at the sides and the center.

Write down each number before you shop, so you can compare every model against the same three measurements. A small difference in one spot can decide the fit.

Take the same three measurements on both sides of the opening, because cabinets are not always square.

Mounting height and the cooktop

The height from the cooktop to the cabinet bottom is easy to get wrong. Measure it at the front edge and write the number down.

Over the range microwave dimensions: checking the height

Use the manual's clearance numbers when they're given. Those numbers come from the maker, so they take priority over any general rule.

Depth when the vent runs behind the unit

If the unit vents outside, the duct and any adapter sit behind it. That space adds to the depth you need, so include it in your measurement.

A recirculating unit has no outside duct, but the filter and its access still need room. Check the manual for how much space the setup takes.

Common measuring mistakes

The first mistake is measuring only once. Measure at least twice, and write down the smallest number for each dimension.

The second is measuring the cabinet front instead of the wall. Depth runs from the wall, not from the front of the cabinet.

The third is using the box size instead of the unit's dimensions. The box is bigger than the unit, so use the numbers from the maker's specs.

Over the range microwave dimensions checklist

• Width: the smallest opening width, measured at the top, middle and bottom.
• Height: the cooktop to the cabinet bottom, measured at the front edge.
• Depth: the wall to the cabinet front, with room for any vent connection.
• Weight: the unit's weight, so you know whether you need a second person.

What to do when the opening is wider than the unit

A 30-inch unit in a wider opening leaves a gap on each side. Trim panels close those gaps, so the unit looks built in.

The 24, 30 and 36 inch guide covers the sizes in more detail. The installation guide explains the planning steps for the unit and the trim.

Will it fit? Check the dimensions before you order an over the range microwave

Measure the width, the height and the depth before you pick a model. Once those three numbers are set, the features and the venting become the next choice.

For a wider set of 30-inch picks, see the 30-inch roundup. The buying guide covers the full range of choices.

Frequently asked questions

What is the standard width for an over the range microwave?

The 30-inch models we checked measure about 29.9 inches wide, so they fit a standard 30-inch opening. Narrower 24-inch units exist for smaller openings, so measure the opening itself before you buy.

How deep is a typical over the range microwave?

The standard-height units we checked run from about 13 to 16.5 inches deep. Slim and low profile models run deeper, from about 18 to 19 inches, so measure from the wall to the cabinet front.

How tall is an over the range microwave?

Standard units run about 15 to 17 inches tall, while low profile and slim units can be around 10 inches tall. Measure the height from the cooktop to the cabinet bottom, since that gap decides which height works.

Do I need to measure the cabinet or the unit?

Measure both, since the unit's dimensions show what it needs and the cabinet opening shows what you have. Compare the two before you buy, and check the depth against the wall and any vent path behind the unit.