Gas Mark Converter
350°F = 177°C
Reference Table
Temperature Scale
Context & Usage
Gas mark is a UK oven temperature scale still used in many British recipes and older gas ovens.
Each gas mark number corresponds to a fixed Fahrenheit and Celsius value, making it a simple lookup rather than a formula-based conversion.
Some British recipes list gas mark alongside a Celsius figure specifically for ovens without a gas mark dial, a dual-labeling convention that became more common as electric ovens spread throughout the UK market.
A Worked Example
Say a British scone recipe calls for Gas Mark 7. Cross-referencing the chart gives approximately 425°F or 220°C — a fairly hot oven suited to getting a quick rise and golden top on a small, delicate baked good like a scone.
Standards and Sources
The gas mark scale was standardized by British gas oven manufacturers in the early-to-mid 20th century as a simplified numeric dial, predating the widespread home use of precise thermostats.
Modern UK and Irish ovens increasingly print both gas mark and Celsius on the same dial, reflecting a gradual shift toward metric temperature display even as gas mark terminology persists in recipe writing.
The Good Housekeeping Institute, a long-standing UK testing authority for home appliances and recipes, has published gas mark conversion tables referenced by many British cookbook publishers for consistency.
Where This Shows Up
US bakers working from British cookbooks, a common source for classic scone, trifle, and pudding recipes, rely on this conversion to translate gas mark instructions to their own oven's display.
Vintage recipe collectors restoring or adapting decades-old British recipe cards frequently encounter gas mark as the only temperature reference given.
Common Mistakes
- Assuming gas mark numbers scale linearly with Fahrenheit or Celsius, when the actual relationship includes irregular jumps between marks.
- Confusing a gas oven's mark setting with an electric oven's equivalent Celsius or Fahrenheit dial, which aren't always identically calibrated.
- Using an outdated or incomplete gas mark chart that doesn't cover the full range from ¼ to 9.
Gas Mark Range: Low vs High
| Low Gas Marks (¼-3) | High Gas Marks (6-9) | |
|---|---|---|
| Approximate range | 225-325°F / 107-163°C | 400-475°F / 204-246°C |
| Common uses | Slow roasting, meringues | Bread, pastry, roasting |
Related Guides
Fahrenheit to Celsius Converter
US recipes almost always use Fahrenheit, while most of the rest of the world bakes in Celsius, makin
Celsius to Fahrenheit Converter
This conversion is essential when following a recipe written in Celsius on a US oven that only displ
Oven Temperature Guide
Recipe terms like 'moderate oven' or 'hot oven' come from older cookbooks and still appear in some b
Oven Calibration Guide
Most home ovens run 15–25°F hotter or cooler than their dial setting, which explains inconsistent ba
Frequently Asked Questions
What is Gas Mark 4 in Fahrenheit?+
350°F, equivalent to 180°C.
Is gas mark still used today?+
Yes, mainly in the UK and Ireland, though many modern ovens display Celsius alongside gas mark.
What is the highest gas mark setting?+
Gas Mark 9, equivalent to about 475°F / 240°C.
Why does gas mark start at ¼ instead of 1?+
The fractional low settings (¼, ½) were included specifically for very slow cooking and warming, below what a whole-number mark would represent.
Is gas mark used outside the UK and Ireland?+
Rarely — it's largely specific to British and Irish gas oven manufacturing history and isn't a common standard elsewhere.