How Long Does an Oven Take to Preheat to 400: Everything You Need to Know
how long does an oven take to preheat to 400

Whether you’re baking, cooking, or simply reheating frozen foods, it’s no secret that ovens have become an indispensable part of your kitchen. Most times, in order to get good results, it’s important to adopt some basic practices, one of which is preheating your oven. 

Preheating your oven properly improves your cooking time and also prevents your food from being unevenly cooked. There are several temperatures you can preheat your oven to, from 300°F up to 450°F, with the most common temperature being 350°F. 

However, if you’re the type that loves the rich, appetizing aroma, and savory notes that are associated with browned well-cooked food, you might want to preheat your oven to a higher temperature such as 400°F. 

This is why most people who love brown foods would love an answer to the question “how long does an oven take to preheat to 400?” The answer depends on the type of oven you have and several other factors that will be discussed here at Cook Room Kitchen!

How Long Does an Oven Take to Preheat to 400 Answered

The time it takes to preheat an oven depends on your desired temperature. Since 375°F is the most commonly used temperature setting, we know on average it takes about 15 minutes to preheat at that temperature. Therefore, it will take an average of about 17 minutes to preheat an oven at 400°F. 

The type of oven also matters here, as gas ovens tend to preheat faster. With a gas oven, preheating at 400 will only take about 12-13 minutes, while electric ovens will take 17-19 minutes. Why is that? Continue reading to learn how ovens work and why their timing differs.

how long does an oven take to preheat to 400

How Ovens Work

Ovens work by making use of heat to raise the internal temperature of a chamber to alter the chemical and physical properties of food, thereby cooking the food.

Electrical Ovens

There are two types of electric ovens: thermal electric ovens and convection ovens. Thermal electric ovens generate heat by sending an electrical current through heating elements installed in the oven. 

While a convection oven works by using fans to distribute hot air throughout the oven cavities. This allows your food to cook evenly. However, these are generally slower at preheating than gas ovens.

Gas Ovens 

Gas ovens are designed in such a way that permits the use of gas to fuel the production of heat inside the oven chamber. The process starts when a lighter ignites the gas, which produces flames that heat the heating elements at the base of the oven compartment. Gas ovens regulate the temperature of the internal compartment by using thermostats. 

There are two kinds of gas ovens. Some gas ovens direct heat from heating elements below the cooking area while others heat the cooking area instantly.

How to Preheat an Oven

Follow these steps to preheat your electric oven:

  1. Remove extra oven racks and baking trays. Then place the rack in use on the right level as required by your recipe. Lasagna and Casseroles should go on the top rack to achieve a crispy top. At the middle rack should be cakes, cupcakes, and cookies. The bottom rack should be for pizzas and flatbreads to achieve a crispy bottom. 
  2. Switch on the oven, set the timer, and regulate the temperature.
  3. After some period of waiting, you know your oven is preheated when the indicator light switches on. However, some ovens have alarms that go off when they’re done while others depend on an oven thermometer placed on the inside. 
  4. Place your food into the preheated oven and make sure you don’t open the oven door too often while the food is cooking.

Factors that Affect the Rate at Which an Oven Preheats 

As mentioned earlier, several factors could influence how long an oven takes to preheat to 400. While some of them are out of your control, here are some factors you should look out for: 

  • Incessant opening of oven door while it’s preheating 
  • Forgetting to take out unused racks from the oven 
  • Ovens with large oven cavities could result in longer preheating times
  • For electric ovens, the Voltage it’s installed on matters. Lower voltages take a longer time while higher voltages will preheat faster.
  • The average temperature of a room could also affect the preheating time of your oven. Colder climates will result in lower room temperatures and will, in turn, result in a longer preheating period. 
  • Old ovens tend to take longer while modern ovens with advanced features have a shorter preheating time. 

Safety Precautions While Preheating 

Practicing good safety precautions while preheating your oven is very important. That being said, here are some simple safety tips that’ll come in handy:

  • It is imperative to always have a fire extinguisher around while using an oven, especially when using a gas oven.
  • Make use of an oven whenever you want to remove and add anything to the oven. Also, try not to keep the oven mitt in contact with the pan for too long because it will eventually start to get hot.
  • Never leave the oven door open while preheating or even while cooking.
  • If you’re a pet owner, make sure to keep your pets away from your oven when it’s in use.


Hopefully this article has answered your question, “how long does an oven take to preheat to 400?”. We also hope that you learned other relevant information, such as the factors that affect preheating, how to preheat, and the safety precautions to take while using an oven.

So, the next time you have to cook with an oven, you should be armed with the right knowledge to ensure that your cooking process goes from start to finish without any problems!

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