Understanding Microwave Cutout Dimensions
What are cutout dimensions?
Cutout dimensions are the exact measurements of the hole or opening you need to cut into your cabinetry to install a built-in, over-the-range (OTR), or drawer microwave. They're different from the microwave's physical dimensions because they account for trim kits, flanges, and installation clearances.
Example:
- Physical width: 29 15/16"
- Cutout width: 30" (for standard range)
- Why the difference? The 30" opening accounts for the trim kit frame and mounting hardware
Why they matter
- Installing a microwave in a cabinet opening that's too small can cause damage to both the unit and cabinet
- An opening that's too large leaves gaps that are difficult to seal and look unfinished
- Improper installation can void warranties and affect venting/clearance safety
- Some models require specific clearances for ventilation or trim kit installation
Finding official cutout dimensions
For GE and Café brands:
- Visit GE Appliances Support
- Search for your model number (e.g., "CVM517P2MS1")
- Download the Installation Instructions PDF
- Look for a section titled "Cabinet Preparation," "Dimensions," or "Cutout Size"
- The cutout opening width and height will be clearly labeled with measurements in inches
For other brands:
Most microwave manufacturers provide installation guides. Here's how to find them:
- Visit the manufacturer's website (Samsung, LG, Panasonic, Sharp, etc.)
- Look for "Support" or "Manuals" section
- Enter your model number (found on a sticker inside the microwave or on the product documentation)
- Download the Installation Guide or Specification Sheet
- Search the PDF for: "cutout," "opening," "cabinet preparation," or "dimensions"
Understanding "Estimated" labels
On MicrowaveFit, some models show an "Estimated" label on cutout dimensions. This means:
- We've calculated the opening size from the physical dimensions and industry standards
- The estimate is based on similar products and manufacturer specifications
- It's likely accurate but not confirmed from the official installation manual
⚠️ Always verify with the official installation manual before cutting your cabinet opening.
What to look for in the manual
When you download the installation guide, look for:
- Cabinet opening size or "rough opening" dimensions
- Cutout width and height (usually in inches)
- Depth requirements (for OTR or drawer units)
- Clearance diagrams showing ventilation requirements
- Trim kit compatibility notes (some models require specific trim kits)
Quick reference: Standard sizes
Most over-the-range microwaves follow these standards, but always verify your specific model:
| Type | Standard Opening Width | Standard Opening Height |
|---|---|---|
| Standard OTR | 30" | 16–17" |
| Compact OTR | 24" | 15–16" |
| Small OTR | 20" | 14–15" |
| Built-in/Drawer | 24–30" | 12–18" |
Getting help
- GE/Café support: GE Appliances Product Support or call 1-800-626-2005
- Other brands: Check the manufacturer's website or call customer service with your model number
- Retailers: Best Buy, Lowe's, and The Home Depot often have specification sheets available
- Installers: A qualified kitchen cabinet installer can verify dimensions before cutting
Pro tip
Before you cut anything, have your contractor or installer review the cutout dimensions from the official manual. It takes 5 minutes and can prevent expensive cabinet repairs.