Oven Temperature Converter

What is an oven temperature converter?

An oven temperature converter turns an oven setting from one scale into the others, giving you the Celsius value, the Fahrenheit value and the nearest UK gas mark at once. You enter a temperature, pick whether it is in °C or °F, and the tool above returns the equivalent so a recipe written for another country’s oven becomes usable on yours without guesswork.

This matters because recipes travel but ovens do not. A British baking book quotes Celsius or gas marks, an American one quotes Fahrenheit, and an old recipe card might use a gas mark with no temperature at all. Getting the conversion right is the difference between a properly risen cake and one that is raw in the middle or scorched on top. The converter handles the arithmetic exactly and matches the gas mark for you, so you can set the dial with confidence.

How does the oven temperature conversion work?

The Celsius-to-Fahrenheit part is pure arithmetic with a single, exact formula:

°F = °C × 9/5 + 32
°C = (°F − 32) × 5/9

Terms and units: °C (Celsius) is the metric scale where water freezes at 0° and boils at 100°; °F (Fahrenheit) is the US scale where water freezes at 32° and boils at 212°. The × 9/5 accounts for Fahrenheit degrees being smaller, and the + 32 shifts the zero point because the two scales start in different places. To reverse the conversion, subtract 32 first, then multiply by 5/9.

Gas marks are a separate UK oven scale that has no formula — it is a fixed lookup table. The marks run from gas mark 1 (about 140°C) rising in steps to gas mark 9 (about 240°C). Because the steps are spaced roughly 10 to 20°C apart, the tool matches your temperature to the nearest standard step rather than calculating it. So a value of 177°C, which sits between the gas mark 4 (180°C) point and the gas mark 3 (170°C) point, is matched to whichever is closer — here gas mark 4.

Temperatures can be entered as whole numbers, and oven dials are coarse instruments, so treat the gas mark and rounded results as the practical setting rather than a laboratory figure.

Examples

Each example below uses the tool’s exact logic: °F = °C × 9/5 + 32, with the gas mark matched to the nearest standard step.

Example 1 — 180°C to Fahrenheit and gas mark

• Fahrenheit: 180 × 9/5 + 32 = 324 + 32 = 356°F
• nearest gas mark: the 180°C step is gas mark 4
• so 180°C = 356°F ≈ gas mark 4, the standard moderate baking temperature

Example 2 — 200°C to Fahrenheit and gas mark

• Fahrenheit: 200 × 9/5 + 32 = 360 + 32 = 392°F
• nearest gas mark: the 200°C step is gas mark 6
• so 200°C = 392°F ≈ gas mark 6, a moderately hot setting for roasting

Example 3 — 350°F to Celsius and gas mark

• Celsius: (350 − 32) × 5/9 = 318 × 5/9 ≈ 177°C
• nearest gas mark: 177°C is closest to the 180°C step, so gas mark 4
• so 350°F ≈ 177°C ≈ gas mark 4

Notice that Example 1 and Example 3 land on the same gas mark: 356°F (from 180°C) and 350°F (the rounded recipe value) both sit at gas mark 4. That is exactly why US recipes round 356°F down to a tidy 350°F — the difference is smaller than an oven dial can resolve.

Oven temperature reference chart

This table shows the standard conversions the tool produces. The exact Fahrenheit column comes straight from the formula; the recipe Fahrenheit column is the round number ovens are usually set to; and the gas mark is the nearest standard step.

Celsius (°C)	Exact °F	Recipe °F	Gas mark	Description
140	284	275	1	Very slow
150	302	300	2	Slow
170	338	325	3	Slow / warm
180	356	350	4	Moderate (most baking)
190	374	375	5	Moderate
200	392	400	6	Moderately hot
220	428	425	7	Hot
230	446	450	8	Hot
240	464	475	9	Very hot

For any temperature not listed, type it into the tool and read the exact Fahrenheit value and matched gas mark.

Common uses

• Baking from a foreign recipe: turn a UK Celsius or gas-mark instruction into Fahrenheit for a US oven, or the reverse.
• Reading an old recipe card: translate a gas mark with no temperature into a number your modern dial uses.
• Setting a US oven from metric: convert 180°C or 200°C to the round Fahrenheit value to dial in.
• Roasting and slow cooking: match a quoted temperature to the right gas mark for a gas oven.
• Following a video or blog: quickly convert a temperature mentioned in another scale while you cook.
• Teaching or homework: show the C-to-F formula at work with a familiar everyday example.

Tips and common mistakes

• Do not forget the +32. Multiplying by 1.8 alone is wrong for everything except 0°C; 200 × 1.8 = 360, but 200°C is actually 392°F.
• Reverse the formula in the right order. Going from Fahrenheit to Celsius, subtract 32 before multiplying by 5/9, not after.
• Round to your oven’s marks. The exact value of 180°C is 356°F, but set the nearest dial mark, which is 350°F.
• Lower the temperature for a fan oven. Fan (convection) ovens cook hotter, so drop the conventional temperature by about 20°C, or roughly one gas mark, as a starting point.
• Gas marks are steps, not a formula. Each mark covers a small range, so the tool matches the nearest one; expect a few degrees of difference from a hand calculation.
• Use an oven thermometer. Many ovens run hotter or cooler than the dial says, so verify with a cheap thermometer if bakes consistently over- or under-cook.

Limitations and notes

This converter handles temperature only — it does not adjust baking time, rack position, pan size or whether your oven is fan-assisted. The Celsius-to-Fahrenheit formula is exact, but oven dials are coarse, so the practical setting is always rounded to the nearest available mark. Gas marks are matched to the nearest standard step on the gas mark 1 (about 140°C) to gas mark 9 (about 240°C) table, which means a temperature falling between two marks is rounded to whichever is closer and may differ slightly from another chart that rounds the other way.

Real ovens also vary: a stated 180°C may read several degrees off from the true cavity temperature, and a fan oven at the same dial setting effectively cooks hotter than a conventional one. Treat the converted figure as the correct setting on paper and let your eyes, a thermometer and an early check confirm the bake. Everything runs privately in your browser; no temperatures you enter are sent to a server or stored anywhere.

For more kitchen conversions, try the air fryer conversion calculator, the recipe scaler and the water to rice ratio calculator on the cooking category page.