What is Celsius to Gas Mark Conversion?

Converting Celsius temperatures to Gas Mark is essential when using a British gas oven with international recipes. Most modern recipes specify temperatures in Celsius, but traditional gas ovens in the UK use the Gas Mark scale.

When You Need This Conversion

This converter is invaluable for:

Using international recipes - Convert metric temperatures for your gas oven
Following cooking shows - Many chefs now specify Celsius
Adapting cookbooks - Modern cookbooks often omit Gas Mark
Sharing recipes - Help friends with gas ovens understand metric temps

Understanding the Scale

Gas Mark isn't a linear scale—it was designed empirically rather than mathematically. The converter uses interpolation to provide accurate settings even for temperatures between standard marks.

Roasting Temperature Guide

140-150°C (Gas 1-2): Slow roasting, pot roasts
160-180°C (Gas 3-4): Standard roasting
190-200°C (Gas 5-6): Crispy skin, fast roasting
220-240°C (Gas 7-9): High heat searing, Yorkshire pudding

How to Use the Celsius to Gas Mark Converter

Simple Steps

Enter Celsius temperature - Type the value from your recipe
Read Gas Mark result - See the appropriate oven setting
Set your oven dial - Turn to the displayed Gas Mark

Common Roasting Conversions

140°C = Gas Mark 1 - Slow roasting, stews
160°C = Gas Mark 3 - Pot roasts, casseroles
180°C = Gas Mark 4 - Chicken, most roasting
200°C = Gas Mark 6 - Crispy potatoes, vegetables
220°C = Gas Mark 7 - High-heat finishing
240°C = Gas Mark 9 - Maximum heat, pizza

Handling In-Between Values

If your recipe calls for 175°C, the converter calculates the closest Gas Mark. You might need to set your oven between two marks or choose the closer whole number.

Temperature Range

Gas Mark covers approximately 107°C (Gas ¼) to 260°C (Gas 10). For temperatures outside this range, your gas oven may not reach the required heat.

Converter Features

Accurate Interpolation

The converter calculates precise Gas Mark values for any Celsius input, including temperatures that fall between standard marks. Get results like "Gas 4.5" for 185°C.

Roasting-Focused Reference

The quick reference table shows common roasting temperatures:

140°C → Gas 1: Very slow roasting
160°C → Gas 3: Gentle heat
180°C → Gas 4: Standard roasting
200°C → Gas 6: High heat
220°C → Gas 7: Very high heat
240°C → Gas 9: Maximum

Real-Time Updates

Results appear instantly as you type, making it easy to check multiple temperatures while planning a roast dinner.

Swap Direction

Click the swap button to convert Gas Mark back to Celsius. Useful when checking traditional recipes against modern cooking guidance.

Works Offline

Once loaded, the converter works without internet connection—convenient when cooking in areas with poor signal.

Frequently Asked Questions

What Gas Mark is 180°C?

Gas Mark 4 is equivalent to 180°C. This is the most common baking and roasting temperature, suitable for cakes, cookies, and poultry.

What Gas Mark is 200°C?

Gas Mark 6 equals 200°C. Use this for roasting vegetables, cooking casseroles with crispy tops, and baking pastries.

What is the hottest Gas Mark?

Gas Mark 10 (260°C/500°F) is the highest setting. Most home cooking uses Gas 4-7, with higher marks reserved for bread, pizza, or quick browning.

My recipe says 175°C - which Gas Mark?

175°C falls between Gas Mark 3 (160°C) and Gas Mark 4 (180°C). The converter calculates approximately Gas Mark 3.75. In practice, set your oven halfway between 3 and 4, or use Gas 4 for slightly higher heat.

Are Gas Mark and oven temperature exact?

Gas Mark is approximate. Individual ovens vary, and the dial positions are not precisely calibrated. Use an oven thermometer if precision matters for your recipe.

Can I use this for fan-assisted gas ovens?

Yes, but reduce by about half a mark for fan-assisted gas ovens, as the circulating air cooks more efficiently. For example, use Gas 3.5 instead of Gas 4.

Celsius to Gas Mark