Oven Temperature Converter
Convert Celsius, Fahrenheit, and Gas Mark for ovens.
What it does
British recipes speak Gas Mark while American ones speak Fahrenheit and most of the world speaks Celsius. Gas numbers climb unevenly against exact thermometers, which is why conversion tables beat formulas here.
The tool above converts any of the three into all three. Pick the source scale, enter the value, and read every equivalent with fan notes.
Fan assisted ovens circulate heat and cook near twenty degrees cooler than the same conventional setting. Recipes written for fan already adjusted; conventional ones need the subtraction.
Thermometers beat dials regardless of scale. Home ovens drift tens of degrees from their knobs, so an oven thermometer calibrates better than any chart.
How to use
- Pick the scale the recipe uses.
- Enter the value or Gas Mark.
- Read all three equivalents.
- Subtract 20 for fan unless the recipe says fan.
Formula
- Gas table
- Fixed UK equivalents, uneven by design.
- C↔F
- Exact linear conversion between the two.
- minus 20
- Fan adjustment from conventional figures.
American Fahrenheit steps of 25 land between Gas Marks: 375 sits at Gas 5 exactly while 400 sits at Gas 6.
Worked example
Example: Gas 4
British recipe calls for Gas 4.
- Table: Gas 4 reads 180 °C and 350 °F.
- Fan: 180 - 20 = 160 °C fan.
- US oven: set 350 °F conventional.
- Check with a thermometer, not the dial.
Reference table
| Gas | Celsius | Fahrenheit | For |
|---|---|---|---|
| 1 | 140 °C | 275 °F | Slow: meringues |
| 2 | 150 °C | 300 °F | Slow: rich fruit cake |
| 3 | 170 °C | 325 °F | Gentle baking |
| 4 | 180 °C | 350 °F | Everyday cakes |
| 5 | 190 °C | 375 °F | Bread, pies |
| 6 | 200 °C | 400 °F | Roasting |
| 7 | 220 °C | 425 °F | Hot roasting |
| 9 | 240 °C | 475 °F | Pizza, flatbreads |
Limits
- Conventional figures. Fan subtracts about 20.
- Dials drift. Thermometers rule.
- Nearest Gas shown for C/F inputs.
- Gas marks stop at 9 in tables.
Common mistakes
- Converting 350°F to 175°C by halving roughly.
- Skipping the fan subtraction.
- Trusting dial numbers over thermometers.
- Interpolating Gas Marks linearly.
- Opening the door to check constantly.
Try it yourself
Quick checks. Answers sit tucked under each question.
Recipe says 200 °C. US setting?
200 x 9/5 + 32 = 392 °F. Set 400 °F, near Gas 6.
Recipe says Gas 7?
220 °C and 425 °F conventional, 200 °C fan.
Questions
What is Gas 4 in Celsius?
180 °C conventional, 350 °F, 160 °C fan.
What temperature is 350°F?
About 177 °C exact, Gas 4 by table convention.
Do fan ovens differ?
Yes, about 20 °C lower for the same cooking.
Why are Gas Marks uneven?
History and thermostat steps. Tables capture the real mapping.
How do I convert quickly?
Double Celsius and add 30 lands near Fahrenheit for oven ranges.
Should I trust my dial?
Verify with an oven thermometer. Dials drift tens of degrees.