Standard Above Range Microwave Size | Dimensions That Fit

A standard over-the-range microwave typically measures 30 inches wide, with height from 16 to 18 inches and depth from 15 to 18 inches. If you’re replacing an old unit or planning a new kitchen, “standard” varies by brand; getting the opening wrong risks poor fit, venting, or unsightly gaps. Here’s how to measure correctly.

Exact Dimensions of a Standard OTR Microwave

Width is fixed: nearly every OTR microwave fits a 30-inch-wide space between upper cabinets. Height and depth vary. Maytag reports most OTR units are roughly 30 inches wide, 17 inches high, and 15 to 18 inches deep with the door closed. Sharp’s guide gives a tighter range: 29.8 to 30 inches wide, 16.5 to 17.5 inches tall, and 15 to 17 inches deep. The Sharp R1874TY lands at 29.93 by 16.34 by 15.56 inches without the handle, showing how one-inch variations matter. You must match the exact spec sheet to your cabinet opening.

How to Measure Your Space Before Buying

Home Depot recommends capturing three dimensions and one clearance check:

1. Width. Measure between the left and right upper cabinets above the range. The gap should be about 30 inches. Record the exact number — a quarter-inch mismatch can cause problems.
2. Height. Measure from the top of your range or cooktop surface up to the bottom edge of the upper cabinet. Common practice uses 30 inches from cooktop to microwave top, but your range height may shift this.
3. Depth. Check how far the upper cabinets extend from the wall. Most are at least 12 inches deep, some 14. Compare this to the microwave’s depth with the door closed, including the handle.
4. Ventilation clearance. Every OTR microwave needs breathing room. The product manual’s minimum clearance numbers override any general rule.

Common mistake: measuring only the old microwave instead of the cabinet opening. Models vary in height by up to two inches. Measure the space, not the appliance.

Swapping an Old OTR Microwave for a New One

A direct swap works only if width, mounting bracket compatibility, and venting path align. Even a “same width” unit can need different bracket placement. Take fresh measurements and cross-check against the new model’s dimensions — never assume the old bracket location carries over. The 30-inch standard means most replacements fit horizontally; height mismatches are the most common surprise. The best reviewed above range microwave models we’ve tested include real-world fit notes.

The One True Size Guide: What Fits Where

The Sharp R1874TY’s depth is measured without the handle; adding about an inch brings real depth to ~16.5 inches. Always check if the spec says “with” or “without” handles.

Three Mistakes That Cost You the Install

• Trusting the old microwave’s label. The sticker may list a generic size. Measure the unit yourself.
• Forgetting the handle. An overhanging handle can bump into adjacent cabinets. Some OTR microwaves have flush handles for tighter spaces.
• Ignoring cabinet depth. Cabinets 12 inches or less force the microwave to stick out further. It’s not a functional problem but worth knowing.

Also check that the range below allows standard cooktop-to-microwave clearance. Most guides call for 30 inches from cooktop to microwave top, but a tall range or raised grate can eat into that gap. Manufacturer instructions are the final authority.