Celsius to Gas Mark Conversion
Quickly convert your oven temp from °C to Gas Mark, including fan/convection ovens
Learn why fan ovens, region differences, and Gas Mark numbers matter. Baking success depends on accurate conversion.
Quick Reference: Celsius to Gas Mark
Use this quick lookup for common oven temperatures, including fan adjustments.
140°C
150°C
165°C
180°C
190°C
200°C
220°C
230°C
240°C
250°C
Gas Mark to Fahrenheit & Celsius Comparison
Compare Gas Mark with Fahrenheit, Celsius, and Fan-adjusted Celsius for oven settings.
| Gas Mark | °F | °C | Fan °C |
|---|---|---|---|
| 1 | 275 | 140 | 120 |
| 2 | 300 | 150 | 130 |
| 3 | 325 | 170 | 150 |
| 4 | 350 | 180 | 160 |
| 5 | 375 | 190 | 170 |
| 6 | 400 | 200 | 180 |
| 7 | 425 | 220 | 200 |
| 8 | 450 | 230 | 210 |
| 9 | 475 | 240 | 220 |
| 10 | 500 | 250 | 230 |
| 11 | 525 | 260 | 240 |
| 12 | 550 | 290 | 270 |
| 13 | 575 | 300 | 280 |
| 14 | 600 | 315 | 295 |
| 15 | 625 | 330 | 310 |
Why Celsius to Gas Mark Conversion Can Be Tricky
Understanding oven temperature systems, fan/convection adjustments, and historical differences.
Different Systems, Different Numbers
Gas Mark originated in the UK and is a simple 1–10 scale for ovens. Celsius is metric, Fahrenheit is imperial. When you ask 'c to gas mark conversion', you are translating one system to another. 180°C may equal Gas Mark 4, but fan oven lowers effective temperature, often by 20°C. That is why recipes sometimes fail if you ignore oven type. Convection spreads heat differently, so fan ovens cook faster. If recipe says 180°C conventional, you set 160°C in fan oven.
- 180°C conventional = Gas Mark 4
- 180°C fan oven = Gas Mark 4, but set oven 160°C
Fan Oven vs Conventional
Fan or convection ovens circulate air, which increases heat efficiency. So same Celsius gives faster cooking. Gas Mark does not account for fan ovens inherently. This means 'c to gas mark conversion' is trickier in modern kitchens. Many people set fan oven same as conventional; mistake. Three-quarter or half hour recipes change drastically. Fan oven reduces time, may require lower temp.
- 200°C conventional = Gas Mark 6
- 200°C fan = Gas Mark 6, adjust to 180°C
Region Usage and Standards
UK uses Gas Mark historically, Celsius now common. US uses Fahrenheit. Some recipes mix these; online recipes vary. 'C to Gas Mark conversion' needs context: country, oven type, convection or not. Metric countries often prefer Celsius, UK older cookbooks Gas Mark. Mistaking system leads to wrong baking temperature. Even Gas Mark numbers differ slightly by manufacturer.
- UK Gas Mark 4 ≈ 180°C
- US 350°F ≈ 180°C
- Fan ovens require subtract 20°C for same Gas Mark
Convection vs Fan Circulation Impact
Fan or convection changes heat transfer, reduces hot/cold spots, cooks faster. 0.5–1 hour recipe may finish 5–10 minutes early. 'c to gas mark conversion' must consider this. Gas Mark numbers do not differentiate between fan and conventional, so user must manually adjust. Incorrect assumptions cause burnt bottoms, dry cakes, uneven browning.
- 180°C conventional = 160°C fan for same Gas Mark
- 200°C conventional = 180°C fan for same Gas Mark
Practical Cooking Implications
When converting 180°C to Gas Mark 4, remember recipe may assume conventional oven. If using fan oven, set 160°C for same Gas Mark. Same applies for all numbers 140–250°C, Gas Mark 1–10. Conversion is simple math, but real-life usage depends on oven efficiency, fan, pan type, altitude. Historical recipes often use Gas Mark; modern European ones Celsius. Understanding differences ensures proper baking.
- 140°C = Gas Mark 1, fan 120°C
- 250°C = Gas Mark 10, fan 230°C
Common Mistakes in C to Gas Mark Conversion
Ignoring fan oven adjustments
Confusing Fahrenheit with Celsius
Assuming Gas Mark is universal
Tips for Accurate Celsius to Gas Mark Conversion
- Always check if your oven is fan/convection or conventional
- Subtract ~20°C when using fan oven compared to conventional Gas Mark
- Use oven thermometer for precise temperature, many ovens are off by 5–10°C
- For unfamiliar recipes, verify Gas Mark number from multiple sources
- Remember US recipes use Fahrenheit, UK older recipes use Gas Mark, Europe uses Celsius
- Avoid rounding too much; small errors in high temperatures can burn baked goods
- Pan type affects heat; dark pans cook faster, light pans slower
- Convection circulates air; adjust both temp and baking time if needed