425°F to Celsius Conversion: Fan, Convection & Air Fryer

Few numbers cause more head-scratching in the kitchen than 425 degrees Fahrenheit when all you have is a Celsius dial. A recipe calls for 425°F, your oven reads metric, and suddenly you’re second-guessing every conversion chart you’ve ever seen. The good news: 425°F is one of the most straightforward temperatures to translate, and once you know the formula and the oven-specific adjustments, you’ll never need to guess again.

425°F in Celsius: 218.33°C ·
Fan oven: 200°C ·
Convection oven: 400°F (204°C) ·
Air fryer: 425°F (no change) ·
Gas mark: 7

Here are the core numbers for 425°F across every common oven type.

What is 425°F in Celsius?

The exact conversion

425°F converts to 218.33°C. That’s the precise math you get when you run the formula C = (F - 32) × 5/9. The Doves Farm conversion table confirms this value, making it the standard reference for UK bakers.

The formula explained

Subtract 32 from 425 (that’s 393), multiply by 5 (1,965), then divide by 9. Result: 218.33°C. RapidTables’ temperature converter uses the same formula and returns the same result, so you can trust it for any conversion.

The implication: Once you know the base Celsius figure, you can apply the same formula to any Fahrenheit number without a chart.

What is 425°F in a fan oven?

Fan oven temperature reduction rule

Fan ovens circulate hot air more efficiently, so you need to reduce the temperature by about 20°C compared with a conventional oven. BBC Good Food’s kitchen team states this rule explicitly: 425°F conventional becomes 200°C fan. That’s a 20°C drop from 218°C.

Common fan oven setting for 425°F

Set your fan oven to 200°C. The heat distribution is more even, which often means food cooks faster. Doves Farm also lists 200°C fan as the equivalent for 425°F, so there’s consensus between editorial and retail sources.

What this means: The 20°C reduction is a safe rule, but you should always start checking for doneness 5 minutes early — fan ovens are rarely identical.

What is 425°F in a convection oven?

Convection vs. conventional settings

In the US, “convection oven” typically means a fan-assisted oven, but the reduction is usually smaller than for European fan ovens. Allrecipes advises reducing the temperature by 25°F — so 425°F conventional becomes 400°F convection (about 204°C). RapidTables’ conversion matches: 400°F = 204.44°C.

Adjusting time and temperature

Because convection ovens cook faster, you should also reduce baking time by about 20%. Arla’s air fryer conversion chart notes that time reductions of 20% are standard — and the same principle applies to convection ovens. For a recipe that originally called for 425°F conventional, set your convection to 400°F and check for doneness 15–20% earlier.

The pattern: Convection adjustments are less aggressive than fan oven rules. The US convection standard of 25°F reduction is close to the 20°C European rule but not identical — always check the manufacturer’s manual.

What is 425°F in an air fryer?

Air fryer temperature conversion

Surprisingly, most air fryer conversion guides say you can set the air fryer to the same temperature as a conventional oven — i.e., 425°F. Everyday Family Cooking advises reducing the temperature by 25°F and reducing time by 20%, but Love And Other Spices suggests a reduction of 25–30°F (or 15–20°C). Arla leans toward a 15–20°C drop. The variation comes from different air fryer models and their heat efficiency.

Cooking time adjustments

All sources agree that air fryers cook faster. Everyday Family Cooking specifies a 20% time reduction. Drizzle and Dip’s guide gives an example: roasted potatoes at 200°C/400°F conventional reduce to 180°C/356°F in the air fryer, and the time drops from 30–35 minutes to 20–25 minutes. For 425°F, you can start with 425°F and check 4–6 minutes earlier than the recipe says.

The trade-off: You can keep 425°F in the air fryer for most recipes, but you must reduce cooking time. The exact reduction depends on your model, so the rule is: check early, check often.

How to convert any conventional oven recipe to 425°F across oven types

1. Identify your oven type. Is it conventional (static heat), fan (forced air), convection (US fan), or air fryer?
2. Apply the temperature rule: For fan oven reduce by 20°C → 200°C. For convection reduce by 25°F → 400°F. For air fryer keep at 425°F or reduce by 25°F if your model runs hot (refer to Everyday Family Cooking).
3. Reduce time by 20%. For a fan oven, convection, or air fryer, start checking 15–20% before the recipe’s end time. Arla confirms this for air fryers; the same logic applies to fan and convection ovens.
4. Check for doneness early. Use a thermometer or visual cue. Everyday Family Cooking advises that times can vary by model.
5. Adjust future attempts. Note what worked. If food is undercooked, add 2–3 minutes next time; if overcooked, reduce time or lower temperature by 10°F/5°C.

What the experts say

425°F converts to about 218°C. That’s based on the standard formula C = (F – 32) × 5/9.

— Doves Farm (flour mill and baking authority)

For fan ovens, reduce the temperature by 20°C. So 425°F conventional becomes 200°C fan.

— BBC Good Food (UK’s leading food media brand)

A good rule of thumb for air fryers is to reduce the temperature by 25–30°F and check for doneness a few minutes earlier.

— Love And Other Spices (cooking conversion resource)

For anyone who bakes or roasts regularly, the conversion from 425°F to Celsius is a cornerstone of high-heat cooking. The base figure of 218.33°C is reliable, but the real utility comes from knowing how to adjust for fan, convection, and air fryer ovens — each with its own reduction rule and time-saving potential. The home cook who owns a fan oven should set to 200°C and start checking 20% earlier, or risk overcooking by relying on the chart alone.

For oven temperatures slightly lower than 425°F, the 400°F to Celsius guide offers helpful conversion tips.

Frequently asked questions