Ninja Foodi 10-in-1 Smart XL Air Fry Oven Review

The Ninja Foodi 10-in-1 Smart XL Air Fry Oven (model DT251) is a large 1800-watt countertop convection oven that air fries, roasts, bakes, and dehydrates on two levels at once, with a built-in Foodi Smart Thermometer that tells you when meat reaches your chosen doneness. It is a strong pick for families who want to replace a toaster oven and a basket air fryer with one appliance, as long as you have the counter space for a unit about 20 inches wide and can live with a noticeable fan. This research-based review covers its specs, all 10 functions, the thermometer, how it compares with Ninja’s DT201 and newer Prestige models, and the ownership details listings tend to skip.

Key takeaways

Ninja Foodi XL Pro Air Fry Oven, 10-in-1, Stainless Steel, DT201 | Fits 5 lb chicken, Air fry, roast, bake, broil, toast, dehydrate, reheat, pizza, 1800W

Included for 'Ninja Foodi 10-in-1 Smart XL Air Fry Oven Review' because the listing specifies 10-in-1 and Stainless Steel, details this guide uses to compare options.

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Ninja Prestige Smart XL Countertop Oven, 10-in-1, Stainless Steel, DT501 | Bakes 20 cookies, Fits 12 lb turkey, Air fry, bake, toast, pizza, reheat, 1800W

Included for 'Ninja Foodi 10-in-1 Smart XL Air Fry Oven Review' because the listing specifies 10-in-1 and Stainless Steel, details this guide uses to compare options.

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Ninja Digital Air Fry Countertop Oven, 8-in-1, XL, Silver, SP101 | Air fry, air roast, broil, bake, toast, bagel, dehydrate, keep warm, 1800W, Flip up & away

Included for 'Ninja Foodi 10-in-1 Smart XL Air Fry Oven Review' because the listing specifies 8-in-1 and Silver, details this guide uses to compare options.

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Ninja French Door Premier Air Fry Oven, 10-in-1, 20.3 Qt, Stainless, FO101 | 450F cyclonic air, PFAS-free surface, Air fry, sear crisp, bake, broil, toast, dehydrate

Included for 'Ninja Foodi 10-in-1 Smart XL Air Fry Oven Review' because the listing specifies 10-in-1 and 20.3 Qt, details this guide uses to compare options.

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• Ninja rates it to fit a 5-lb chicken plus a sheet pan of vegetables, two 12-inch pizzas, or a 12-lb turkey.
• The built-in Smart Thermometer offers 4 protein settings and 9 doneness levels, the main upgrade over the non-smart DT201.
• True Surround Convection cooks on two racks without rotating pans, and Ninja quotes a 90-second preheat.
• It measures about 17.1 x 20.2 x 13.3 inches, so measure your counter and cabinet clearance first.
• The DT251 is now mostly found as remaining or renewed stock; the Prestige Smart XL Pro (DT551) is Ninja’s newer smart-thermometer option.

Ninja Foodi 10-in-1 Smart XL Air Fry Oven at a Glance

Here are the core specifications, taken from Ninja’s owner’s manual and retailer spec listings.

Ninja also claims up to 30 percent faster cooking than a traditional convection oven and up to 75 percent less fat when air frying compared with deep frying. Read those as manufacturer figures; actual results depend on food, load size, and rack position.

The 10 Functions and When to Use Each

Ninja Foodi Smart XL Air Fry Oven: How the Smart Thermometer Works

The thermometer is what puts “Smart” in the name. It plugs into the oven and monitors internal temperature, so the oven can stop cooking when the food reaches your target. Here is the typical flow, based on the owner’s manual:

1. Choose a function such as Whole Roast or Air Roast. The thermometer works with roasting and similar modes where a protein cooks for a while.
2. Insert the probe into the thickest part of the meat. Avoid touching bone or fat pockets; both give false readings.
3. Plug the thermometer into its jack on the oven. The display switches to show thermometer mode.
4. Select the protein and doneness. Pick one of 4 protein settings and a doneness from rare to well done, across 9 levels.
5. Start cooking and watch the target vs current readout. The display shows both values, so you can see progress without opening the door.
6. Let the meat rest. Internal temperature keeps rising a few degrees after cooking, which is why doneness presets account for resting.

For food safety guidance, follow recognized minimum internal temperatures, such as 165°F for poultry, and use the thermometer to confirm rather than guess.

Ninja Foodi 10 in 1 Review: Strengths and Weak Spots

What it does well

• Two-level cooking without rotation. Owners and reviewers consistently highlight sheet-pan dinners on both racks as the standout use.
• Built-in thermometer. Removes guesswork for roasts, chicken, and pork, which is the most common reason people choose the DT251 over the DT201.
• Fast preheat. A 90-second preheat (per Ninja) makes it practical for weeknight meals instead of heating a full oven.
• Large capacity. Fits family-size portions, a 12-inch pizza per level, and a whole turkey on the Whole Roast setting.
• Helpful display handle. The handle shows rack positions and pauses settings changes while the door is open.

Where it falls short

• Footprint. At roughly 20 inches wide and 17 inches deep, it occupies more counter than most basket air fryers or toaster ovens.
• Fan noise. Some buyers comment on the noise level of the convection fan, which runs hard in air fry modes.
• Exterior heat. Like most countertop ovens at 450°F, the top and sides get hot; allow clearance and avoid placing items on top.
• Availability. As a 2020-era model, new stock is limited and much of what remains is renewed; newer Ninja ovens may be easier to find.

Will It Fit? A Worked Counter-Space Check

Measure before buying. The oven’s body is about 20.2 inches wide, 17.1 inches deep, and 13.3 inches tall.

• Footprint: 20.2 x 17.1 inches is about 345 square inches, or roughly 2.4 square feet of counter.
• Depth: Standard counters are about 25 inches deep, so the oven fits with around 8 inches to spare front to back, enough for the door to open forward without hanging over the edge too much.
• Height: Upper cabinets usually sit about 18 inches above the counter. With a 13.3-inch oven, that leaves under 5 inches above it. Check the clearance Ninja specifies in the manual for your unit; if in doubt, pull the oven forward from under the cabinets while cooking, because hot air vents upward.
• Door swing: The door opens down and forward; allow space in front for sliding out the sheet pans.

Example: a 30-inch stretch of counter between a sink and a fridge fits the oven with about 5 inches of side space on each side, which is workable for a dedicated appliance spot.

Ninja DT251 vs DT201 vs Newer Ninja Models

If you can find a DT251 in good condition, it covers almost everything the newer XL models do. If not, the DT551 is the closest current match for a thermometer-equipped XL oven, and the DT201 is the simpler choice if you already own a separate meat thermometer.

Cleaning and Long-Term Ownership

Countertop ovens stay pleasant to use only with regular cleaning. Ownership realities to plan for:

• Empty the crumb tray after most uses. Built-up crumbs smoke at high temperatures and can scorch.
• Line the bottom pan for messy roasts. Use the roast tray over a sheet pan so drippings stay contained.
• Hand wash accessories gently. Nonstick-coated pans and the air fry basket last longer without abrasive scrubbers. Follow Ninja’s manual on what is dishwasher safe.
• Wipe the door glass while warm (not hot). Grease is easier to remove before it bakes on during the next cook.
• Keep vents clear. Do not block the top or back with containers or a cutting board.
• What wears first: on most air fry ovens, the coating on sheet pans and baskets shows wear before the oven itself. Ninja sells replacement accessories for many models; check availability for the DT251 specifically.

Tips to Get Better Results

1. Follow the display handle’s rack guidance. It reflects how the convection airflow is designed for each function.
2. Do not overcrowd the air fry basket. Air needs to reach every side to crisp food.
3. Toss or flip halfway for small items. Even with surround convection, fries and wings brown more evenly when moved once.
4. Use a light oil spray, not pooled oil. A thin coat crisps; excess oil drips and smokes.
5. Reduce oven-recipe times when adapting. Convection cooks faster; check 5 to 10 minutes early on traditional recipes.

Who Should Buy It, and Who Should Skip It

Buy it if you cook for three to six people, want sheet-pan meals on two racks, like the idea of a built-in thermometer, and have about 2.5 square feet of free counter.

Skip it if you cook mostly for one or two people (a smaller basket air fryer or compact toaster oven is quicker to clean), your counter is shallow or crowded, or you are sensitive to fan noise.

How We Evaluated

This is a research-based review. We did not personally use the DT251. We compiled specifications from Ninja’s owner’s manual and retailer spec sheets, compared it with Ninja’s current XL and French-door ovens, and summarized recurring owner feedback, such as fan noise and capacity praise, from public retailer listings and owner discussions.

Frequently Asked Questions

What is the difference between the Ninja DT251 and DT201?

Both are 10-in-1 XL air fry ovens with two-level cooking. The DT251 adds the built-in Foodi Smart Thermometer with protein and doneness presets. The DT201 skips the thermometer.

Can the Ninja Foodi Smart XL Air Fry Oven cook a whole turkey?

Ninja states it fits up to a 12-lb turkey using the Whole Roast function. Larger birds will not fit, and you should confirm doneness with the thermometer.

How hot does the Ninja DT251 get?

It reaches up to 450°F. The exterior also gets hot during use, so keep clearance around it and do not store items on top.

Is the Ninja Foodi 10-in-1 Smart XL Air Fry Oven loud?

Some owners describe the fan as noticeably loud, particularly in air fry mode. It is typical of powerful convection ovens, but worth considering for open-plan kitchens.

Can I use both racks at the same time?

Yes. True Surround Convection is designed for two-level cooking without rotating pans, such as a protein on one rack and vegetables on the other.

Is the Ninja DT251 still sold?

New units are increasingly scarce, and many listings are renewed. Ninja’s Prestige Smart XL Pro (DT551) is a newer XL oven with a smart thermometer, and the DT201 remains a non-thermometer alternative.