How To Measure an Over-the-Range Microwave For Replacement

So, your over-the-range microwave finally gave up or maybe you’re just ready to upgrade to something a little nicer. Whether it’s broken, outdated, or just not your style anymore, replacing it means one important thing: you’ve got to measure the space.

Now, before you grab a tape measure and start eyeballing things, let’s go over how to do this the right way. Measuring for a new over-the-range microwave isn’t hard, but doing it wrong can lead to buying the wrong size, a return process hassle, or worse, an installation that won’t fit. 

We’ll will walk you through how to measure an over-the-range microwave for replacement. Let’s get started.

What Is an Over-the-Range Microwave?

If you’re not sure what kind of microwave you have, let’s clear that up.

An over-the-range (OTR) microwave is the kind that’s mounted above your stove or cooktop. It’s not just a microwave; it also acts as a range hood, with a built-in fan and sometimes a light underneath. It saves space by combining two appliances into one.

If your microwave is sitting on the counter, this article won’t help much. But if it’s hanging out above your stove and you want to replace it with another over-the-range model, keep reading.

What You’ll Need Before You Start Measuring

• A tape measure 
• A notepad to jot down your measurements
• A step stool or ladder if your microwave is mounted a little high
• Maybe a second person if you’re taking down the old microwave (but not necessary just for measuring)

If you still have the manual or model number of your current microwave, it might come in handy later. You can often find this info inside the door or on a label along the frame.

The Three Big Measurements You Need

There are three key measurements to take when you’re replacing an over-the-range microwave:

1. Measure the Width (Left to Right)

This is the most straightforward measurement. Grab your tape measure and measure the space between your upper cabinets, where the microwave fits.

• Start from the left edge of the cabinet to the right edge.
• Write this number down in inches.

Standard width for most over-the-range microwaves is 30 inches, but always confirm. Some older kitchens or compact models might be 24 or 36 inches wide.

Pro Tip: If your microwave is snug between cabinets, make sure to measure cabinet-to-cabinet, not just the width of the microwave itself. You want to know how much space is actually available.

2. Measure the Height (Top to Bottom)

Next, you want to measure the vertical space between the bottom of your upper cabinet and the top of your range or cooktop.

This measurement helps ensure that your new microwave won’t hang too low over your stove, or worse, not leave enough space for safety and proper venting.

• Measure from the bottom of the cabinet to the top of the stove.
• Record this in inches.

The standard height for most OTR microwaves is around 16 to 17 inches, but the space above your range should be at least 30 inches total from stovetop to cabinet bottom for most building codes (check your local code to be sure!).

Microwave tip: Some models are a little taller, especially if they offer extra interior capacity. If you don’t have at least 30 inches of clearance between your stovetop and the bottom of the upper cabinet, you may need to consider a low-profile model.

3. Measure the Depth (Front to Back)

Depth is where things can get a little tricky. You’ll need to know how far your microwave can stick out without looking awkward or blocking your range controls.

• Measure from the wall (or the back panel) to the front of the cabinet.
• Then, measure how far your current microwave extends past the cabinet (if it does).

Most standard OTR microwaves are around 15 to 17 inches deep, not including the handle.

Things to consider:

• Make sure the door can open fully without hitting a wall or cabinet.
• If your stove has a large backsplash or protruding trim, factor that in.

Other Measurements You Might Need

While width, height, and depth are the big three, there are a couple of extras to check if you want to be extra thorough (and avoid surprises during installation):

Check Venting Setup

Is your current microwave venting upward, out the back, or just recirculating air through a filter?

You can usually tell by:

• Looking for a vent grille on the top (upward venting)
• Feeling for air coming from the top front (recirculating)
• Looking for a duct going out the wall (rear venting)

Write this down so you can look for a compatible model, or plan to adjust the ductwork during installation.

Power Cord Location

Most microwaves plug into an outlet inside the upper cabinet. Make sure that outlet exists, and take note of where it is. If it’s in a weird spot, your new microwave’s power cord might need to be longer.

Now That You’ve Measured, What Next?

You’ve got your measurements. Now it’s time to shop smart.

What to Look For:

• A microwave that matches or is slightly smaller than your measured width and height.
• A depth that doesn’t stick out too far (especially if you have a narrow kitchen).
• A venting option that matches your current setup, or can be adjusted.
• Bonus features like smart sensors, convection options, or fingerprint-resistant finishes.

Where To Get More Help

Measuring for a new over-the-range microwave doesn’t have to be a chore, and now that you know what to look for, you can shop with confidence. If you need any replacement parts for your appliances, you can enter your model number at AppliancePartsPros.com to locate and order them quickly. Most orders arrive in just two business days, and we have tons of great information in our repair help section and YouTube videos to help you troubleshoot.

Stay connected with the latest DIY tips, tutorial videos, and repair guides by following us on Facebook, Instagram, and Twitter. We love hearing about your repair stories and successes. If you need more help, feel free to reach out. We’re ready to help you take on your next project with confidence!

The information in this article may not apply to your specific appliance model. We recommend consulting your manufacturer’s documentation or contact us with any questions.

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Where to put a microwave in the kitchen

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