# Oven temperature and pan size converter

> Convert oven temperatures between °C, °F, fan oven and gas mark, and work out how much to scale a recipe for a different round, square or rectangular pan.

交互版本：https://www.calcopenly.com/zh/everyday/oven-temperature-and-pan-size-converter
主题：日常计算器

Oven temperatures convert with °F = °C × 9/5 + 32. A fan oven is set about 20 °C below a conventional one, and gas mark 1 is 275 °F (140 °C), with each mark adding 25 °F. For pans, the ingredient factor is the area of your pan divided by the area of the recipe's pan, which keeps the batter at the same depth.

The default converts 350 °F: 176.7 °C, which recipes round to 180 °C, or 156.7 °C in a fan oven (usually written 160 °C), and gas mark 4. In pan mode, a 9-inch round pan (63.6 sq in) and an 8-inch square pan (64 sq in) hold almost the same amount, a factor of 1.006.

Oven thermostats and fans vary, so treat the converted setting as a starting point. When batter ends up deeper or shallower than the recipe intended, check for doneness early.

## 输入

- **单位换算** (选项：Oven temperature, Pan size)
- **Oven setting**
- **Setting is in** (选项：°C, °F, Fan °C, Gas mark)
- **Convert to** (选项：°C, °F, Fan °C, Gas mark)
- **Recipe pan shape** (选项：Round, Square, Rectangle)
- **Recipe pan diameter**
- **Recipe pan side**
- **Recipe pan length**
- **Recipe pan width**
- **Your pan shape** (选项：Round, Square, Rectangle)
- **Your pan diameter**
- **Your pan side**
- **Your pan length**
- **Your pan width**

## 结果

- Conventional oven (°C) — 主要结果
- Conventional oven (°F)
- Fan oven (°C)
- Gas mark
- Multiply ingredients by
- Recipe pan area (cm²)
- Your pan area (cm²)
- Recipe pan area (in²)
- Your pan area (in²)

## 公式

$$
\begin{gathered}{}^\circ F = {}^\circ C \times \tfrac{9}{5} + 32 \\ \text{fan} = {}^\circ C - 20 \\ \text{pan factor} = \frac{A_{\text{your pan}}}{A_{\text{recipe pan}}}\end{gathered}
$$

## 计算示例

### 350 °F → °C

- 单位换算: Oven temperature
- Oven setting: 350
- Setting is in: °F
- Convert to: °C
- **Conventional oven: 176.7 °C**
- **Fan oven: 156.7 °C**
- **Gas mark: 4**
- 核验来源：Python decimal: (350 − 32) × 5/9; gas mark 4 = 350 °F (gas mark table)

### 180 °C → °F

- 单位换算: Oven temperature
- Oven setting: 180
- Setting is in: °C
- Convert to: °F
- **Conventional oven: 356 °F**
- **Gas mark: 4**
- 核验来源：180 × 9/5 + 32 = 356; nearest mark is 4 (350 °F)

### Gas mark 1/4

- 单位换算: Oven temperature
- Oven setting: 1/4
- Setting is in: Gas mark
- Convert to: °C
- **Conventional oven: 107.2 °C**
- **Conventional oven: 225 °F**
- 核验来源：Gas mark table: 1/4 = 225 °F; Python decimal (225 − 32) × 5/9

### Fan 160 °C to °F

- 单位换算: Oven temperature
- Oven setting: 160
- Setting is in: Fan °C
- Convert to: °F
- **Conventional oven: 356 °F**
- **Conventional oven: 180 °C**
- 核验来源：Which? rule: fan + 20 = 180 °C conventional; 180 × 9/5 + 32

### 200 °C to gas mark

- 单位换算: Oven temperature
- Oven setting: 200
- Setting is in: °C
- Convert to: Gas mark
- **Gas mark: 6**
- 核验来源：200 °C = 392 °F; nearest mark 6 = 400 °F (gas mark table lists 200 °C as mark 6)

### Boiling point is below gas mark 1/4

- 单位换算: Oven temperature
- Oven setting: 100
- Setting is in: °C
- Convert to: °F
- **Conventional oven: 212 °F**
- **Gas mark: Below 1/4**
- 核验来源：100 × 9/5 + 32 = 212 °F, under 225 °F

## 常见问题

### What is 180 °C in Fahrenheit?

356 °F, from 180 × 9/5 + 32. Recipes round it to 350 °F, which is gas mark 4, and the Which? oven conversion table puts 180 °C, 160 °C fan, 350 °F and gas mark 4 on the same row. Going the other way, 350 °F is exactly 176.7 °C.

### How much lower should a fan oven be?

About 20 °C lower than the conventional temperature, according to Which?, so 180 °C becomes 160 °C fan and 200 °C becomes 180 °C fan. The fan moves hot air over the food, and leaving the setting unchanged can cook the outside too quickly. Oven makers' manuals give the figure for a specific model.

### What temperature is gas mark 4?

180 °C (350 °F), or 160 °C in a fan oven. Gas mark 1 is 140 °C (275 °F) and each mark adds 25 °F, about 14 °C: gas 6 is 200 °C (400 °F) and gas 9 is 240 °C (475 °F), as listed in the Which? table. The Celsius values are rounded to the nearest 10 °C.

### Can I use an 8-inch square pan instead of a 9-inch round one?

Yes. A 9-inch round pan has an area of π × 4.5² = 63.6 square inches and an 8-inch square pan has 64, so the recipe needs no change. A 9 × 13 inch pan has 117 square inches, 1.84 times the 9-inch round, so batter for the rectangle fills nearly two round pans to the same depth.

### How do you adjust a recipe for a different cake tin?

Multiply every ingredient by the new tin's area divided by the old tin's area. For round tins that is the ratio of the diameters squared: moving from a 20 cm to a 23 cm tin is (23 ÷ 20)² = 1.32, so use about a third more of everything. The batter then sits at the same depth, so the baking time stays close to the original.

### “Oven temperature and pan size converter”有多准确？

准确性取决于输入值和方法的假设。十进制运算使用50位有效数字，但估算、数值方法和源数据的精度可能较低；显示时的舍入并不能消除这些限制。 已按独立来源核验的计算示例：9。 例如，“350 °F → °C”根据Python decimal: (350 − 32) × 5/9; gas mark 4 = 350 °F (gas mark table)进行核验。

### 这种方法出自哪里？

Gas mark — conversion table (1 = 275 °F, +25 °F per mark); Which? — Oven temperature conversion table (fan ovens 20 °C lower).

## 来源

- [Gas mark — conversion table (1 = 275 °F, +25 °F per mark)](https://en.wikipedia.org/wiki/Gas_mark)
- [Which? — Oven temperature conversion table (fan ovens 20 °C lower)](https://www.which.co.uk/reviews/built-in-ovens/article/oven-temperature-conversion-table-aA5Ol9b157On)