Oven Temperature Converter: Gas Mark, °C, °F & Fan

📏 Productivity & Units

Recipe says

Choose the mode used for the temperature printed in the recipe.

Your oven is

The selected oven mode determines the target temperature.

Temperature in the recipe

Recipe unit

Fan temperature difference

Default 20°C is a starting point. Follow the recipe and your oven manual.

°C

Set your oven to

Celsius—

Fahrenheit—

Gas mark reference—

Where this setting sits

Check an oven thermometer

Compare one thermometer reading with the converted dial setting. Ovens cycle around their setpoint, so repeat a reading before drawing conclusions.

Converted dial setting180°C

Thermometer reads (°C)

This comparison is a snapshot, not an oven calibration or repair diagnosis. Check the manufacturer’s guidance.

Gas mark and oven temperature conversion chart

The fan column uses the adjustable difference above. Fahrenheit recipe values are conventional chart equivalents, rounded independently.

Gas mark	Conventional °C	Fan °C	Typical US recipe °F	Typical use

Convert gas marks, Celsius and Fahrenheit

Use the converter to translate the temperature printed in a recipe into the setting for your own oven. It handles common searches such as gas mark 4 to Fahrenheit, 350°F to Celsius, and a conventional recipe to a fan oven. The mode controls matter: a recipe that already lists a fan temperature should not receive a second fan adjustment.

Gas mark 4 in Celsius and Fahrenheit

Gas mark 4 is conventionally listed as 180°C for a conventional oven, 160°C for a fan oven when using a 20°C chart difference, and 350°F in many US recipe charts. These are familiar chart values rounded for recipe use: 180°C converts mathematically to 356°F, while 350°F converts to about 176.7°C. The separate recipe charts do not match digit for digit.

Conventional and fan oven settings

Moving air changes how heat reaches food, so a fan-assisted oven may need a lower dial setting than a conventional recipe. The correct difference varies by oven and recipe. This tool starts at 20°C and lets you change the amount; check your oven manual and the recipe’s stated mode. For a recipe already written for a fan oven, select “Fan / convection” under “Recipe says” so the converter does not apply the correction twice.

Gas mark to fan oven conversions

The chart shows conventional and fan Celsius values side by side. Gas marks are best understood as conventional chart references; if a recipe gives a fan-specific value, enter its Celsius or Fahrenheit temperature and select the fan mode. At the top and bottom of the gas-mark scale, published charts can differ slightly because the Celsius equivalents are conventional approximations.

Check the oven dial with a thermometer

Place an oven thermometer as its maker directs, allow the oven to preheat, and compare the reading with the converted setting. A single reading can be affected by normal heating cycles, thermometer position and the measurement device. Repeat checks at the same shelf position and use the oven manufacturer’s instructions before changing any calibration setting.

Reference guidance

Oven manufacturers can use different fan-conversion rules. For example, some Bosch manuals recommend a 20–30°C reduction for fan cooking, while a US Bosch manual describes a 25°F adjustment when automatic conversion is disabled. Those examples are model-specific and are not exact equivalents: 20°C is 36°F. Follow the instructions for your oven and recipe.

Oven temperature conversion FAQs

What is gas mark 4 in Celsius and Fahrenheit?

Gas mark 4 is commonly charted as 180°C conventional, 160°C fan with a 20°C reduction, and 350°F in US recipes. The chart values are rounded independently: 180°C is 356°F by arithmetic conversion.

How do I convert a conventional recipe for a fan oven?

Choose Conventional under Recipe says and Fan / convection under Your oven. Start with the adjustable 20°C difference, then follow your recipe and oven manual.

What is 350°F in Celsius?

350°F is about 176.7°C by the formula. Recipe charts often round this to 180°C, which is why it may not exactly match a gas-mark chart.

Should I adjust a recipe that already gives a fan temperature?

No second adjustment is needed when the recipe mode and your oven mode match. Choose Fan / convection for both if the recipe already specifies a fan oven.

Is the fan temperature difference always 20°C?

No. It is a common starting point, not a universal rule. The amount depends on the oven and recipe; check the oven manual. Twenty degrees Celsius equals 36°F, not 25°F.

How can I check whether my oven dial is accurate?

After preheating, compare an oven thermometer reading with the target setting and repeat at the same location. Ovens cycle around their setpoint, so one reading is not a calibration result.

Can I convert a gas mark to a fan oven setting?

Use the chart’s fan column as a starting point. For recipes that provide a fan-specific Celsius or Fahrenheit number, enter that value and select Fan / convection as the recipe mode.

Related tools in Productivity & Units

📏Electricity Tariff UnitsNormalize energy prices before comparing utility and wholesale quotations. 📏Attachment LimitsAttachments are base64 encoded, which adds exactly a third. The limit applies after encoding, so the number on the file is not the number that counts. 📏Displacement CalcA millimetre of bore adds more capacity than a millimetre of stroke. And one cubic centimetre off the chamber moves compression from 10.5 to 10.68. 📏EV Charging CSVTurn one measured charging session into a reproducible local CSV row.

#cooking #temperature #conversion #everyday

Browse all Productivity & Units tools

The person who builds ecech., at the desk where the tools are written.

Made by one person

ecech. is not a content farm. Every tool here is written and checked by hand, one at a time, by someone who wanted the tool to exist and could not find a version that showed its working.

No accounts and no sign-in, and nothing you type reaches a server — every calculation on this page runs inside your browser. The ads are served by Google and do set their own cookies, which is set out in full on the privacy page. More about the site.