Ninja Foodi 7-in-1 Multi-Cooker 7.5l OP450UK review 2022

An all-round gem of an air fryer, this Ninja could replace lots of pots in your kitchen. It cooks plenty – but you need some patience to master its 7 functions. And small kitchens beware, this Ninja is big and heavy.

  • Versatile cooking
  • Heavy and not suitable for small kitchens
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Capacity (litres)7.5
Functions includeAir fry, Grill, Roast, Bake, Steam, Sear/Saute, Pressure cook, Slow cook, Keep warm, Max crisp
Cooking zones1
Dishwasher-safe parts
Rotating basket
Capacity and size★★★★★
Stated functions★★★★★
Overall Finder score★★★★★

What can you cook in a Ninja Foodi 7-in-1 Multi-Cooker 7.5l OP450UK?

Ninja air fryers come with their own recipe book and this one is over 60 pages long, making it a great resource for multicooker newbies.

Multi-level meals can be made with grains at the bottom of the pot, roasted veg on the lower rack and protein on the top layer. The rack is included, which isn’t always the case with fryers.

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Air frying fish fingers only took a matter of minutes without preheating. Finder

The capacity of the cooking pot is huge. It can accommodate far more than several other Ninja models like the AF100 or OP350UK, which is 6 litres. This one can take an entire chicken or a lamb or pork shoulder. While the Ninja Foodi Dual Zone Air Fryer can take a similar amount in its 2 compartments, it can’t cook saucier dishes – which the OP450UK can do. This means curries, stews and soups are all on the menu.

How big is the Ninja Foodi 7-in-1 Multi-Cooker 7.5l OP450UK?

At 11.3kg the OP450UK is the heaviest of all the air fryers we’ve reviewed, 0.3kg heavier than the Ninja OP350UK 9-in-1 and a stonking 7kg heavier than the Ninja AF100. The heft is partly due to the pressure-cook function.

The size isn’t as striking – only the 39cm width comes in over the average for an air fryer. One thing to note is the height when the crisping lid is open. It will likely bang into low-hanging kitchen units as when fully open, the machine is 57cm tall.

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The Ninja jolts up in size when you open its crisping lid, which cannot be detached. Finder

The pressure lid, on the other hand, can be twisted off, but has to be stored separately.

If you want a smaller air fryer that does a similar job, the Instant Pot Duo Crisp is a worthy contender.

Is the Ninja Foodi 7-in-1 Multi-Cooker 7.5l OP450UK convenient to use?

You’ll need to learn the different functions, how to use the cooking racks and which lid to use. The controls are not intuitive and there are no presets for specific foods. However, air frying as a standalone function is simple to use, but it’s best to set the time lower and add more time if you need it, as the air crisper is fast.

Preheating is advised but not necessary, so you can get cooking straight away. There isn’t a rotating element involved but we found from cooking various foods – chips, burgers and fish fingers – that you get an even cook without having to turn anything.

Cleaning the pot, crisper basket and racks is a doddle in the dishwasher.

Where this machine falls short, as with other Ninjas, is the lack of a transparent viewing window, so you’ll have to check your food from time to time, especially as a new user. Leaving food in the air fryer after it’s finished cooking will dry it out.

If you want to see how your food’s doing without the guesswork, consider the Tefal Actifry Genius XL, which has a viewing window.

Ninja Foodi 7-in-1 Multi-Cooker 7.5l OP450UK customer reviews

This Ninja Foodi is hailed on Amazon, John Lewis, Argos and Very as an excellent machine. Some have called it a monster – it is quite large – but add that it does everything they want. The capacity is a highlight as are the multiple functions.

Critics dislike its size, which makes it hard to store unless you have a huge kitchen, or a spare barn. Some customers were annoyed with the crisping lid that doesn’t come off.

Pros and cons


  • Versatile for all-in-one meals
  • Excellent capacity
  • Easy to clean
  • Easy to use
  • Not noisy


  • Bulky
  • No viewing window
  • You’ll have to master the functions to get the best from it

Our verdict: Is Ninja Foodi 7-in-1 Multi-Cooker 7.5l OP450UK any good?

This Ninja earned a “Finder Recommended” accolade because it’s our top pick for complete meals. It is the sensei of fryers and if you learn its functions you’ll be slicing through recipes in no time. The dual crisp and pressure cooker functions combine the best elements of cooking in one (big) machine. Frying food is rapid. A viewing window would have been a bonus.

With pressure cooking, you can gently decompress the Ninja manually or let it do its thing naturally. Either way, it won’t be making a horrible noise.

It’ll cook for a large family, and the tiered rack makes stacked complete meals without much fuss. If you have a big household to feed and don’t mind learning this Ninja’s functions, we think you’ll grow to wonder how you got by without one.

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Review by

Reemul is a writer at Finder, specialising in product reviews and news. He's a qualified journalist having worked at local papers in the UK covering breaking news, food and restaurant reviews. He has an MA in Film from UCL and a BA in History and French from Durham University.

Expert review

This air fryer knocks plenty of others out of the park. It’s one of the most versatile we’ve seen and Ninja is targeting larger families with this model – its impressive 7.5-litre capacity can accommodate a whole turkey. However, 7 cooking functions may take some time to master, and you’ll need one lid for crisping and another for pressure cooking.

This Ninja will tower over your kettle, plus it’s very heavy. Based on our cooking tests, we think it takes a few tries to master all the aspects of this fryer. Happily, there’s a cooking guide to help.

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