How Do I Measure for a New Over-the-Range Microwave?
Q: I want to replace my over-the-range microwave. How do I measure my space so the new one fits under my cabinets and over my range safely?
A: For an over-the-range (OTR) microwave, you’ll want to confirm cabinet width, the clearance above your cooktop, cabinet depth, and the space needed for venting and mounting. Getting these measurements right helps your new microwave look built-in, mount securely, and maintain safe clearances in real Florida cooking conditions.
1) Measure the Cabinet Width
Most OTR microwaves are built to fit a 30-inch wide space:
- Measure the width between the left and right upper cabinets above your range.
- Write down the exact measurement (don’t assume it’s 30").
- If your opening is not close to 30", Beacon can help you choose a model or trim solution that fits cleanly.
2) Measure Clearance Above the Cooktop
This measurement helps confirm safe working space over the range:
- Measure from the top of the cooking surface to the bottom of the cabinet (or to the bottom of the current microwave).
- Many manufacturers target roughly 17–19 inches of clearance, but always compare to the new model’s installation guide.
- Think practically: if you use tall pots on the front burners, make sure there’s enough room to lift lids and stir safely.
3) Measure Cabinet Depth and Microwave Projection
Depth determines how the microwave will look and feel when installed:
- Measure from the wall to the front edge of the upper cabinets.
- Many OTR microwaves extend slightly beyond cabinet depth so you can see and reach the controls.
This helps you understand how far the new microwave may project over the range.
4) Check Venting Type and Mounting Locations
Most OTR microwaves are either ducted outside or set up to recirculate air back into the kitchen. Before ordering, note:
- Whether the current unit is ducted outside or recirculating.
- Any existing vent cutouts or duct connections in the top cabinet or the wall behind the microwave.
- The location of the upper cabinet bolt holes (the long bolts that hang the microwave) and the wall mounting bracket.
Many replacements can reuse existing venting and hardware locations, but it’s still worth confirming what you already have.
Safety note: If you’re unsure about venting or electrical connections, avoid disassembling anything. A few clear photos are often enough for Beacon to help you plan safely.
5) Measure for Delivery and Installation Access
Even though OTR microwaves are lighter than many appliances, installation requires stable access:
- Measure the narrowest doorway and hallway on the path to your kitchen.
- Confirm there’s enough clear space in front of the range for a ladder or step stool during installation.
If you’re also replacing the range, visit “How Do I Measure for a New Range or Oven?” so the two appliances coordinate properly.
Bring Your Measurements and Photos to Beacon
Once you’ve measured width, clearance, and depth (and noted your venting type):
- Write your dimensions down clearly.
- Take photos of the existing microwave area, the inside of the upper cabinet, and any visible ducting.
- Bring everything to Beacon so we can match you with an OTR microwave that fits and vents correctly.
Our friendly technicians in yellow can also handle installation so your new microwave is mounted securely and safely.
More Help With Appliance Measurements
For more step-by-step guides, visit the Appliance Measurement Help Center and explore:
You can also find microwave troubleshooting and usage tips in the Microwave Help Center.