May 25

How Long to Preheat Oven | Why is it Important to Set the Thermometer Properly?

Author: Gisele Perez and its partners may earn a commission if you purchase a product through one of our links.

For the most part, the issue with perfectly preheating your oven until it reaches the correct temperature has been eradicated in most households. How long it takes to preheat the oven to all desired temperatures is now controlled by a sophisticated oven thermometer.

Hence, preheating the oven to the temperature a recipe calls for is usually as simple as setting the thermometer to the appropriate Fahrenheit level and allowing it to do its thing.


Nevertheless, not all modern ovens are quite as capable or accurate as they might be when it comes to heating themselves up to the perfect temperature. This applies to both the traditional gas oven and conventional electric ovens alike, which in both instances may need a little TLC to preheat perfectly. However, if your oven is not heating up properly, this post may prove useful.

And just for the record, the answer is yes - preheating your oven to the perfect temperature really does make a difference. How accurately you preheat your gas oven or electric oven not only affects how long it takes to cook whatever is inside but can actually make your favorite baked goods taste even better than they already do.

Preheat Your Oven Properly: How Does Preheating Work?

Ovens preheat when the heating mechanism inside your oven is activated, gradually preheating the cavity to the required temperature. The gas flame or heating element gets to work on both the cold air inside the oven and its thermal mass - i.e., the floor, ceiling, walls, trays, and pans, etc.

chicken in oven

Proper preheating is only possible when the oven door is kept closed throughout the process so as to ensure the heat is evenly dispersed and every part of the interior reaches the correct temperature.  Whether looking to bake cookies or slow cook a roast, it is essential to preheat your oven before you place the food inside.

Why is it Important to Preheat the Oven?

Allowing your oven to preheat is important for several major reasons. First and foremost, where a recipe calls for an oven to be preheated to a specific oven temperature, this is exactly what you need to do to make sure the dish is a success. Unless it specifically states that the ingredients should be placed into a cold oven (which is occasionally the case), the temperature indicated in the preheated temperature required.

In addition, when you place items and ingredients in cold ovens, you subsequently subject them to a range of temperatures that may adversely affect the way they cook. For example, if something needs to be cooked at 350 degrees Fahrenheit for 20 minutes, it could spend the first 15 minutes at 100 degrees, 150 degrees, 220 degrees, and so on. Subsequently, it spends 10 to 15 minutes of the cooking time not at the right temperature.

egg shaped timer

Again, if a recipe states that you need to set the oven to 350 degrees, this always indicates the preheated temperature - unless specifically stated otherwise.

That is unless you want a loaf of bread that’s still raw in the middle, a dish that is undercooked in the middle, or cakes that never fail to sink.

How Long Does It Take for An Electric Oven to Heat Up?

If you have a decent electric oven, chances are it has a fairly reliable thermostat. In addition, most electric ovens have at least a basic thermometer for you to keep an eye on the temperature.

In any case, most modern ovens with an electric heating element take between 10 and 15 minutes to preheat. It, of course, depends on the target temperature and other factors (such as the quality of the oven), but more often than not, this is the approximate time frame.

If in doubt, wait 15 minutes, and your oven will almost certainly be at the right temperature. If not, it could be time to consider upgrading to something a little more efficient.

silver oven in the kitchen

How Long Does It Take for A Gas Oven to Heat Up?

One of the biggest benefits of a traditional gas oven is the way in which they preheat significantly faster than their electric counterparts. It can be slightly more difficult to control temperatures with pinpoint precision, but ovens powered by gas are nonetheless great for speeding things along.

Depending on the type of cooker you have (and its size etc.), it is often possible to perfectly preheat a gas oven in as little as 5 minutes.


What Kinds of Things Can Affect Preheating Times?

All appliances and cookers are unique; therefore, they often take different amounts of time to reach the temperature required. Though in all instances, there are several factors that can affect how long it takes before an oven reaches the temperature required, which are the same for all different types of ovens.

Examples of which include:

  • The number of racks and trays there are in the oven at the time. Every additional pot, pan, or accessory in the oven will need to be fully heated before the oven is ready to use, extending the preheating time.
  • Whether or not you keep the door closed while you preheat your oven, as to open the door for even a second or two can result in much of its hot air content escaping into the open.
  • Bigger ovens with larger cavities will always take significantly longer to heat than their smaller counterparts. However, larger ovens of a higher standard tend to distribute heat more evenly and ensure that foods are cooked fully throughout.
  • The temperature of the room the cooker is in can also be a factor. If it is particularly hot or cold when you decide to bake a batch of cookies, your oven may heat up faster or more slowly accordingly.
  • Power ratings and the general quality of the oven will also play a major role in determining how long it takes to heat up. Powerful modern ovens can be heated to any required temperature in no time - preheating older ovens with minimal power is a much more laborious experience.
made in oven

Quick note - if your oven seems to be taking much longer than normal to heat up, there could be something wrong with the heating element, the gas delivery system, or the seals designed to keep the hot air inside. If in doubt, arrange for a professional electrician to inspect your oven at the earliest juncture, just to be safe.

How To Prepare An Oven For Preheating

Anything you can do to speed up the process of bringing up your oven to the desired temperature is worth considering.  It is worth remembering that along with the inconvenience of waiting around for your oven to preheat, appliances that take longer to warm up are often far less energy-efficient and expensive to run.

Actually, preparing an oven for efficient preheating is fairly straightforward. All you need to do is remove every pot, pan, and baking tray you don’t intend to use while ensuring the interior of the oven is relatively clean and keeping the door properly closed. On the side of maintenance, this article on how to clean the oven burners is also a good read.

clean oven

Additional tip - if you are cooking something you would prefer to be crispy on the top, position your tray or rack higher in the oven. For dishes like pizza, where a crispy bottom is preferred, place the tray lower down.

Additional Tips and Extras

Rounding things off, we will now be taking a brief look at a few additional tips and tricks for avoiding uneven heat and preventing heat loss. Both of which could have a major impact on your recipes and result in using more electricity or gas than necessary.

First up, avoid the temptation at all costs to open the door of the oven unless it is absolutely necessary to do so. You’d be amazed just how much heat can escape from inside your oven in just a second or two, which could make all the difference with various types of recipes and baked goods. Baking projects, in particular, can be ruined outright with unnecessary door openings.

dont open the doors

In addition, it can be useful to get into the habit of setting your oven to a temperature around 75° F higher than the recipe states. Then, when you open the door of your oven and place the ingredients into it, you close the door and immediately turn the temperature down to the specified temperature. This is to compensate for the inevitable heat loss when opening the oven door, which typically averages around 75°.

Last but not least, adding further thermal mass to your oven may seem counterproductive but can be useful if maintaining accurate and even temperatures is an issue. A prime example of this is a pizza stone, which effectively works as a storage heater when placed on the bottom rack. It will subsequently take slightly longer to preheat your oven, but the heat absorbed and stored by the stone will help make sure the required temperature is maintained much more evenly.

About the author

Gisele Perez

When not giving in-home, hands-on cooking classes, or developing recipes, Gisele "cooks" wonderful posts for us. She writes about various topics related to cooking appliances and cooking methods.


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