Oven Temperature Conversion Chart: Fahrenheit, Celsius & Gas Mark
Oven Temperature Conversion Chart: Fahrenheit, Celsius, and Gas Mark
If you’ve ever followed a recipe from a UK or Australian cookbook and hit a temperature like “Gas Mark 4,” or tried to convert a European recipe listed in Celsius to your US oven, you know the frustration. Oven temperature conversions come up constantly in cooking and baking, and getting them wrong can mean undercooked centers, burnt edges, or bread that never rises properly.
This guide gives you the full conversion chart, explains what gas marks actually mean, and covers the adjustments worth knowing for baking specifically.
Fahrenheit to Celsius to Gas Mark Chart
| Fahrenheit (°F) | Celsius (°C) | Gas Mark | Description |
|---|---|---|---|
| 225°F | 110°C | ¼ | Very low / warming |
| 250°F | 120°C | ½ | Very low |
| 275°F | 140°C | 1 | Low |
| 300°F | 150°C | 2 | Low |
| 325°F | 160°C | 3 | Moderate/slow |
| 350°F | 180°C | 4 | Moderate (most common baking temp) |
| 375°F | 190°C | 5 | Moderately hot |
| 400°F | 200°C | 6 | Hot |
| 425°F | 220°C | 7 | Hot |
| 450°F | 230°C | 8 | Very hot |
| 475°F | 245°C | 9 | Very hot |
| 500°F | 260°C | 10 | Extremely hot / broiling range |
These are rounded to the nearest standard oven dial setting — ovens are rarely precise to the exact degree, so recipes and manufacturers round to these common points.
The Conversion Formulas
If you need an exact conversion rather than the rounded chart above:
°C = (°F − 32) × 5/9
°F = (°C × 9/5) + 32
Example: Converting 375°F to Celsius: (375 − 32) × 5/9 = 190.5°C, which rounds to the standard 190°C setting.
What Is a Gas Mark, and Why Does It Exist?
Gas Mark is a temperature scale used mainly in the UK and Ireland, originally developed for early gas ovens that didn’t have precise temperature dials. Instead of a thermostat reading in degrees, gas ovens were calibrated to numbered settings (¼ through 10), each corresponding to a rough temperature range.
Even though most modern UK ovens now have digital or dial temperature displays in Celsius, Gas Mark numbers still appear in a lot of British recipes and cookbooks out of tradition, which is why the conversion still matters for anyone following international recipes.
Fan (Convection) Oven Adjustment
One conversion that trips people up even more than Fahrenheit-to-Celsius is the difference between a conventional oven and a fan (convection) oven. Fan ovens circulate hot air, which cooks food faster and more evenly — so recipes written for one type need adjusting for the other:
- Conventional recipe → Fan oven: Reduce the temperature by about 20°C (or ~25°F), or reduce cooking time by about 10-20%.
- Fan oven recipe → Conventional oven: Increase the temperature by about 20°C (or ~25°F).
This matters most for baked goods like cakes and pastries, where an oven running hotter than expected can dry out the outside before the inside finishes cooking.
Why Getting This Right Matters for Baking Specifically
Baking is far less forgiving of temperature errors than most cooking. A few reasons oven temperature accuracy matters more here:
- Leavening timing: Baking soda and baking powder react to heat on a specific timeline — an oven that’s too cool can cause a cake to collapse before it sets.
- Gluten and structure: Bread and pastry rely on the right temperature to set their structure at the right moment; too low, and the dough spreads instead of rising.
- Sugar and fat behavior: Cookies spread differently depending on oven temperature — too hot, and the edges burn before the centers cook; too cool, and they spread too thin.
Quick Tips for Accurate Oven Temperatures
- Use an oven thermometer — many home ovens run 15-25°F off from their dial setting, which matters far more for baking accuracy than any conversion rounding.
- Preheat fully before putting food in — opening the door repeatedly to check can drop internal temperature by 25-50°F temporarily.
- Adjust for altitude if baking above 3,000 feet — high-altitude baking often requires slightly higher temperatures and shorter bake times due to lower air pressure.
Frequently Asked Questions
Is 180°C the same as 350°F?
Very close — 180°C converts exactly to 356°F, but 350°F is the standard rounded oven dial setting most recipes use interchangeably with 180°C.
Do I need to adjust cooking time as well as temperature when converting?
Usually not for a straight Fahrenheit-to-Celsius conversion, since you’re aiming for the same actual heat level. Time adjustments mainly come into play when converting between conventional and fan (convection) ovens.
Why do American and British recipes use different scales in the first place?
The US never adopted the metric system for everyday use, so it kept Fahrenheit, while the UK transitioned to Celsius as part of broader metrication in the 1960s-70s — though older gas mark references persisted in recipes.
Need to convert a specific temperature? Use our Temperature Converter for instant Fahrenheit-Celsius conversions.