Owner’s manual
What is the standard size of a countertop microwave?
There is no single “standard” countertop microwave size, but most fall in a common range. For Kenmore model 40572129310, the external dimensions are 20.5 x 15.9 x 12.8 inches (W x D x H) with a 1.2 cu. ft. capacity; confirm placement and clearances in the owner's manual.
Most countertop microwaves are designed to fit on standard counters and under many upper cabinets. Common ranges are:
- Width: about 20 to 25 inches
- Depth: about 14 to 20 inches (not counting handle, if applicable)
- Height: about 11 to 15 inches
- Capacity: about 1.0 to 2.2 cu. ft.
Here are the model-specific specs pulled from the documentation:
| Spec | Kenmore 40572129310 |
|---|---|
| External dimensions (W x D x H) | 20.5 x 15.9 x 12.8 in |
| Oven capacity | 1.2 cu. ft. |
| Turntable diameter | 12.4 in |
| Rated output power | 1100 W |
Even if the microwave “fits,” it still needs airflow.
- Leave at least 3 inches between the microwave and adjacent walls
- Keep one side open
- Leave at least 12 inches of clearance above the microwave
- Do not block intake or outlet vents
- Use a level, stable surface and keep the unit away from heat sources
Correct sizing prevents blocked vents, overheating, and poor performance. It also helps you avoid buying a microwave that fits the footprint but fails due to inadequate top or side clearance.
Last updated: February 2026
Are Kenmore microwaves good?
Kenmore microwaves are a solid choice for everyday reheating, defrosting, and basic cooking, especially when you want straightforward controls and good value. For the Kenmore 40572129310 countertop microwave, following the safety, cookware, and use guidelines in the owner's manual helps you get the best performance and reliability.
Most customers judge a microwave on a few practical points. Here’s what typically matters most:
- Heating performance: how evenly it warms common foods (leftovers, beverages, frozen meals)
- Ease of use: clear keypad, simple presets, readable display
- Noise and vibration: fan and turntable sound during operation
- Durability: door feel, keypad response, and consistent heating over time
- Safety and proper use: using microwave-safe containers and avoiding arcing
Using the right cookware and habits makes a bigger difference than most people expect.
- Use microwave-safe glass, ceramic, and labeled microwave-safe plastics
- Avoid metal, metal-trimmed dishes, and aluminum trays (they can cause arcing)
- Vent or pierce covered foods and “boiling bags” as directed to prevent steam buildup
- Keep the oven openings clear; do not cover or block vents
- Clean the door and sealing surfaces with mild, nonabrasive soap and a soft cloth
| Material | Typical result | Recommendation |
|---|---|---|
| Glass/ceramic | Heats food well | Use |
| Microwave-safe plastic wrap/containers | Convenient for covering | Use (keep wrap off food) |
| Paper towels/wax paper | Helps prevent splatter | Use short-term with supervision |
| Metal or metal trim | Can spark and arc | Avoid |
| Aluminum tray | Can arc | Avoid; transfer food |
“Good” performance depends heavily on proper cookware and safe operation. Arcing from metal or using the wrong containers can cause burn marks, poor heating, and unnecessary wear.
For more troubleshooting if performance drops, we recommend our guide: why is my microwave not heating.
Last updated: February 2026
How many cubic feet is a Kenmore Model 40572129310 microwave?
The Kenmore 40572129310 countertop microwave has an oven capacity of 1.2 cubic feet. This capacity is listed in the specifications section of the owner's manual, along with key specs like wattage and exterior dimensions.
You will see the capacity listed as “Oven Capacity: 1.2 cu.ft.” in the specifications for model 405.72129310.
- Look for the Specifications section
- Confirm you are viewing model 405.72129310 (not a different 405.7212xxxx variant)
- Use capacity (cu. ft.) to compare interior space between countertop microwaves
A 1.2 cu. ft. countertop microwave is a mid-size unit that typically handles common items like dinner plates and standard microwave-safe containers.
- Good fit for most 10 to 12 inch plates
- Works well for reheating meals and cooking packaged foods
- Often paired with a 12 inch class turntable (this model lists a 12.4 inch turntable diameter)
| Spec | Value |
|---|---|
| Oven capacity | 1.2 cu. ft. |
| Output power | 1100W |
| Turntable diameter | 12.4 in |
| External dimensions (W x D x H) | 20.5 x 15.9 x 12.8 in |
Capacity helps you choose cookware that fits, estimate how evenly food will rotate on the turntable, and compare this Kenmore countertop microwave to other models when shopping for a replacement or planning counter space.
Last updated: February 2026
Where can I find my Kenmore microwave model number?
On your Kenmore countertop microwave model 40572129310, the model number is printed on the rating label, typically located around the door opening (door frame) or on the back panel. The owner's manual also lists the supported model series.
Look for a silver or white sticker or plate with the model number and electrical ratings.
- Door frame area behind the door (around the opening)
- Inside edge of the control panel area (near the door opening)
- Back panel of the microwave cabinet
- Side panel of the cabinet (less common on countertop units)
- On the packaging or purchase paperwork (if you still have it)
Most Kenmore microwaves use a rating label that includes the model number plus power information (watts) and sometimes a serial number.
| What you see on the label | What it means | Why you need it |
|---|---|---|
| Model number (example: 40572129310) | Exact product ID | Ensures correct parts and diagrams |
| Serial number | Production identifier | Helps match revisions when ordering parts |
| Electrical ratings (volts, amps, watts) | Power requirements | Helps confirm proper outlet and circuit |
We use the exact model number to match the correct Kenmore microwave parts list, diagrams, and troubleshooting information. Even small model number differences can change door switches, fuses, or control components.
- Copy the model number exactly as printed (all digits, no spaces).
- Take a clear photo of the label for reference.
- If the label is worn, check the back panel next; it often stays readable longer.
Last updated: February 2026
