Oven Temperature Converter
Fahrenheit, Celsius, and the Odd One Out: Gas Mark
Fahrenheit and Celsius convert to each other with a clean linear formula. Gas Mark, the numbering system used on many UK and older gas ovens, doesn't — it's a published lookup table rather than a formula, built up in uneven steps that don't correspond to a fixed number of degrees each. Converting to or from Gas Mark means matching against that reference table, interpolating between points for values that fall in between.
The Formula
F = C × 9/5 + 32
Gas Mark converts via the standard published Gas Mark/Celsius/Fahrenheit oven chart
All conversions route through Celsius internally: Fahrenheit and Gas Mark inputs are first converted to Celsius, then from Celsius to whichever unit is requested.
Where This Matters
- Following UK recipes — many British and European recipes specify Gas Mark or Celsius rather than Fahrenheit.
- Older ovens — some vintage gas ovens are dialed in Gas Mark numbers only.
- Recipe adaptation — converting a recipe's temperature to match whatever scale your oven actually displays.
Standard Gas Mark Reference Table
| Gas Mark | Celsius | Fahrenheit |
|---|---|---|
| ¼ | 110°C | 230°F |
| ½ | 120°C | 248°F |
| 1 | 140°C | 284°F |
| 2 | 150°C | 302°F |
| 3 | 160°C | 320°F |
| 4 | 180°C | 356°F |
| 5 | 190°C | 374°F |
| 6 | 200°C | 392°F |
| 7 | 220°C | 428°F |
| 8 | 230°C | 446°F |
| 9 | 240°C | 464°F |
Fahrenheit values are computed exactly from Celsius (F = C × 9/5 + 32); Gas Mark values not on this table are interpolated between the nearest published points.
How to Use This Calculator
- Enter the Temperature Value (or the Gas Mark number if converting from Gas Mark).
- Select the source unit — Fahrenheit, Celsius, or Gas Mark.
- Select the target unit you want to convert to.
- Select Calculate to get the converted temperature.
Related Calculations
Once the oven temperature is set, estimate roasting time with the Cooking Time Calculator, or convert ingredient quantities with the Unit Converter for Recipes.