A recipe says to bake at 180°C, but your oven dial only shows Fahrenheit. To convert oven temperature Celsius Fahrenheit accurately, you only need one simple formula – and a little sensible rounding. That matters because a temperature that is slightly off may only change cooking time, while one that is far off can leave a cake dry, a roast undercooked, or cookies spread too thin.
How to Convert Oven Temperature Celsius to Fahrenheit
To change Celsius to Fahrenheit, multiply the Celsius temperature by 9, divide by 5, then add 32.
Fahrenheit = (Celsius × 9/5) + 32
For example, a recipe calling for 180°C becomes:
(180 × 9/5) + 32 = 356°F
Most American ovens are marked in 25°F increments, so set the oven to 350°F or 375°F depending on the recipe and your oven’s available settings. For 180°C, 350°F is the usual practical choice.
You can also use a simpler kitchen shortcut: double the Celsius number and add 30. It is not exact, but it works well enough for many everyday recipes. Using this method, 180°C becomes about 390°F, so it is less reliable at higher temperatures. For baking, the full formula or a conversion chart is the better option.
How to Convert Fahrenheit to Celsius
If you are using an American recipe with a Celsius-marked oven, reverse the calculation:
Celsius = (Fahrenheit – 32) × 5/9
For example, 350°F converts as follows:
(350 – 32) × 5/9 = 176.7°C
Since most ovens cannot be set to a decimal, round it to 175°C or 180°C. In this case, 180°C is the common equivalent for a 350°F recipe.
Rounding is normal in cooking. Recipes are generally designed around practical oven settings, not laboratory-level precision. The best setting depends on whether you are baking a delicate sponge cake, roasting vegetables, or reheating a casserole.
Oven Temperature Conversion Chart
This quick chart covers the temperatures that appear most often in home recipes. The Fahrenheit numbers are rounded to settings available on most US ovens.
| Celsius | Fahrenheit | Common use | | — | — | — | | 120°C | 250°F | Slow cooking, meringues, warming | | 150°C | 300°F | Gentle baking, slow roasting | | 160°C | 325°F | Cakes, custards, casseroles | | 175°C | 350°F | Cookies, cakes, baked dishes | | 180°C | 350°F | General baking and roasting | | 190°C | 375°F | Pies, breads, roasted vegetables | | 200°C | 400°F | Roasting, pastries, crisping | | 220°C | 425°F | Pizza, scones, high-heat roasting | | 230°C | 450°F | Fast roasting and pizza | | 250°C | 475°F | Very hot baking and finishing |
You may notice that 175°C and 180°C both often become 350°F. That is not a mistake. Their exact Fahrenheit values are 347°F and 356°F, respectively, and 350°F is the most useful setting for both on many ovens.
Why Exact Conversion Is Not Always Necessary
Oven temperatures are not as exact as recipe numbers can make them seem. Many household ovens run a little hot or cool, and their temperature can rise and fall as the heating element cycles. A conversion difference of 5°F to 10°F is rarely a problem for everyday cooking.
Baking is where accuracy matters most. Yeast breads, soufflés, sponge cakes, macarons, and custards can react noticeably to too much or too little heat. If you make these foods regularly, an inexpensive oven thermometer can be more helpful than trying to calculate to the nearest degree. It tells you the temperature inside the oven, rather than the temperature selected on the control panel.
For roasting meat and vegetables, use visual cues and internal temperature as well as the oven setting. Vegetables should be browned at the edges and tender in the center. Meat should reach the safe internal temperature recommended for the type of food. A converted oven temperature provides the starting point, but it does not replace checking doneness.
Conventional Oven vs. Convection Oven
Before converting a recipe temperature, check what type of oven the recipe expects. A conventional oven heats mostly through still air. A convection oven uses a fan to circulate hot air, which can cook food more quickly and brown it more evenly.
When adapting a conventional recipe for a convection oven, reduce the converted temperature by about 25°F. For example, if a recipe calls for 350°F, try setting a convection oven to 325°F. If your oven uses Celsius, that is approximately 160°C instead of 175°C or 180°C.
Some modern ovens automatically make this adjustment when convection mode is selected. Others do not. Your oven manual can clarify how its convection setting works, but your own results are useful too. If cookies brown too quickly or a casserole dries out, lower the temperature slightly next time.
Preheating Makes the Conversion Work
A correct conversion only helps if the oven is fully preheated. Putting food into an oven that is still climbing toward the target temperature can affect texture, rise, browning, and total cooking time.
Give the oven time to preheat, even if its signal says it is ready quickly. Many ovens indicate that they have reached the selected temperature before the walls, racks, and air inside have fully stabilized. For most baking, waiting another five to 10 minutes is a practical habit.
Try to avoid opening the door repeatedly during the first part of baking. Each opening releases heat, and the oven needs time to recover. This is especially relevant for cakes, quick breads, and pastries, which can lose height if the temperature drops early.
Common Conversion Mistakes to Avoid
The most common mistake is treating Celsius and Fahrenheit as though they increase at the same rate. They do not. A change of 10°C equals a change of 18°F, which is why simply adding or subtracting a fixed number does not work.
Another issue is confusing a fan-assisted temperature with a conventional temperature. British, Australian, and European recipes may state “fan oven” or “convection,” often with a lower recommended setting. If a recipe calls for 180°C fan, setting a conventional American oven to 350°F may be too low. In many cases, a conventional equivalent would be closer to 375°F.
Finally, do not assume every oven heats the same way. Rack position, dark versus light baking pans, pan size, and the amount of food in the oven all affect results. A dark metal pan absorbs heat faster than a light-colored pan, so baked goods may brown sooner even at the correct converted temperature.
A Practical Approach for Any Recipe
Start by converting the stated temperature using the formula or chart. Choose the closest setting your oven allows, then consider the recipe itself. For delicate baking, use an oven thermometer and follow the time closely. For roasting and casseroles, check food near the end of the recommended cooking time and adjust if needed.
Once you learn the common matches – 160°C to 325°F, 180°C to 350°F, 190°C to 375°F, and 200°C to 400°F – reading recipes from different countries becomes much easier. A good conversion gets the oven in the right range; careful observation helps you make the meal turn out the way you intended.
