Gas Mark to Celsius (GM to °C) Converter

About Gas Mark to Celsius Conversion

This tool converts Gas Mark (GM) to Celsius (°C) instantly and accurately. Just type a value and the equivalent appears in real time — useful for everyday checks, study, cooking, and technical work alike.

Gas Mark is an empirical scale, not a linear formula. The tool maps each value to its standard oven temperature and interpolates in between.

Why Use This Converter

Use international recipes correctly on a British gas oven
Adapt traditional UK cookbooks for modern electric ovens
Find the right roasting and baking setting every time

Common Use Cases

Roasting & Baking

Match recipe temperatures to the right gas oven setting.

UK Cookbooks

Follow traditional British recipes that list Gas Mark settings.

Everyday Cooking

Quickly look up the setting you need while preparing a meal.

How to Use the Converter

Enter the Gas Mark value

Type your temperature in the input field. Decimals and negative values are fully supported.

Read the Celsius result

The equivalent in Celsius appears instantly as you type — no calculate button needed.

Copy or swap

Click copy to save the result to your clipboard, or use the swap button to reverse the direction and convert Celsius back to Gas Mark.

Worked Example: Gas Mark 4 → 180°C (Gas Mark 4 corresponds to a 180°C oven setting)

Quick Reference Points

Gas Mark	Celsius
Gas 1	140°C
Gas 2	150°C
Gas 3	160°C
Gas 4	180°C
Gas 5	190°C
Gas 6	200°C
Gas 7	220°C
Gas 8	230°C

Converter Features

Real-Time Conversion

Results update as you type, so you can compare several temperatures quickly without pressing any button.

Two-Way Conversion

The swap button instantly reverses the direction, turning the tool into a Celsius to Gas Mark converter without leaving the page.

One-Click Copy

Copy the converted value to your clipboard with a single click and paste it into documents, messages, or other apps.

Accurate Calculation

Conversions use the exact mathematical formula and are rounded to 4 decimal places for practical, reliable accuracy.

Mobile-Friendly

Large touch targets and a responsive layout make the converter easy to use on phones and tablets, even while cooking or on the go.

Private & Offline

All calculations run locally in your browser. Nothing is sent to a server, and the tool keeps working once loaded, even without internet.

Frequently Asked Questions

What is Gas Mark 4 in Celsius?

Gas Mark 4 equals 180°C (356°F), the most common temperature for cakes, cookies, and general baking.

What is Gas Mark 6 in Celsius?

Gas Mark 6 equals 200°C (400°F), standard for roasting vegetables, casseroles, and pastries.

Should I adjust for a fan oven?

Yes. Fan ovens cook more efficiently — reduce the converted temperature by 20°C. Gas Mark 6 (200°C) becomes 180°C in a fan oven.

What is the lowest Gas Mark?

The lowest common setting is Gas Mark ¼ (107°C) for very slow cooking; Gas Mark ½ (121°C) suits meringues and slow drying.

Gas Mark to Celsius