Fan Oven Temperature
Converter

How do I convert a conventional oven temperature to fan oven?

The simple rule: reduce the temperature by 20°C (35°F). So if a recipe says 200°C in a conventional oven, set your fan oven to 180°C. Alternatively, keep the same temperature but reduce cooking time by 10–15%.

Why is a fan oven hotter than a conventional oven?

Fan ovens (also called convection ovens or fan-assisted ovens) use a fan to circulate hot air constantly around the food. This transfers heat more efficiently than a conventional oven where heat simply rises. The circulating air removes the cool boundary layer around food, which is why it cooks faster at a lower setting.

What is the fan oven equivalent of 180°C?

180°C conventional is 160°C fan, which is Gas Mark 3. This is a common temperature for most cakes, Victoria sponge, and biscuits. In Fahrenheit: 356°F conventional becomes 325°F fan.

Do I always need to reduce the temperature for a fan oven?

As a general rule, yes — reduce by 20°C. Some modern fan ovens are more subtle in their effect. If you notice food browning faster than expected, reduce further. For very delicate bakes like soufflés or chiffon cakes, some bakers prefer to keep the temperature the same but reduce time by 10%.

Can I use a fan oven for all recipes?

Most recipes work well with the 20°C reduction. The main exceptions are recipes that rely on dry, still heat — meringues (which can crack from airflow) and some delicate custards. If a recipe specifies a conventional oven, apply the reduction and check earlier than the stated time.

What is the fan oven equivalent of Gas Mark 6?

Gas Mark 6 is 200°C in a conventional oven. In a fan oven that becomes 180°C (356°F). This is a hot oven temperature used for roasting chicken, cooking chips, and baking bread.