How to convert Celsius to Fahrenheit
- 1 Type a value in the degrees Celsius box; the degrees Fahrenheit appear as you type.
- 2 Or type in the degrees Fahrenheit box to convert the other way.
- 3 Use the conversion table below for common values, or copy the result.
Remembering key temperatures
A few anchors make estimates easy: 0 °C is 32 °F, 10 °C is 50 °F, 20 °C is 68 °F, 30 °C is 86 °F and 37 °C is 98.6 °F. Every 5 °C is 9 °F, so you can count up from the nearest anchor.
Cooking from a metric recipe? Convert weights with Grams to Ounces. To convert °F back, use Fahrenheit to Celsius, or the Temperature Converter for Kelvin.
- Ovens vary, so use an oven thermometer if a converted recipe browns too fast.
- For fevers, the thermometer type matters more than the conversion; follow its instructions.
- Weather apps can switch units, which avoids converting every forecast.
Features
Exact formula
°F = °C × 1.8 + 32, with negative values supported.
Everyday chart
Weather, fever and oven temperatures in one table.
Two-way
Type °F to get °C.
When to use it
Fever checks
37 °C is 98.6 °F, and 38 °C, a common fever threshold, is 100.4 °F. Reading a US thermometer? Use Fahrenheit to Celsius.
Weather
30 °C is 86 °F and 0 °C is 32 °F, the freezing point of water.
Baking
An oven at 180 °C is 356 °F, usually set as 350 °F in US recipes. Converting recipe weights too? See Grams to Ounces.
Travel packing
Checking the forecast for a trip to the US? Converting the local Celsius forecast helps you compare with what you are used to, and decide on coats or summer clothes.
Related Unit tasks
Frequently asked questions
How do I convert Celsius to Fahrenheit?
Multiply by 9, divide by 5, then add 32. 25 °C × 9/5 = 45, plus 32 = 77 °F.
What is 37 °C in Fahrenheit?
37 °C is 98.6 °F, the traditional normal body temperature.
What is 0 °C in Fahrenheit?
0 °C is 32 °F, the temperature at which water freezes.
Is there a quick way to estimate?
Double the Celsius figure and add 30. 20 °C gives 70 °F; the exact answer is 68 °F.
When are Celsius and Fahrenheit the same?
At −40 degrees, which is −40 °C and −40 °F.
What is 100 °C in Fahrenheit?
100 °C is 212 °F, the boiling point of water at sea level.
How do I convert a temperature change?
For a difference, multiply by 1.8 without adding 32. A rise of 10 °C is a rise of 18 °F.
What is 40 °C in Fahrenheit?
40 °C is 104 °F, a very hot summer day.
What is 20 °C in Fahrenheit?
20 °C is 68 °F, a comfortable room temperature.
What is −18 °C in Fahrenheit?
−18 °C is about 0 °F (−0.4 °F), the usual setting for a home freezer.
Why does the United States use Fahrenheit?
The Fahrenheit scale was widely used in Britain and its colonies before the metric system. Most countries later switched to Celsius, but the United States kept Fahrenheit for weather, cooking and medicine at home.
Is the result rounded?
The tool shows two decimal places. For weather and cooking you can round to the nearest whole degree without any practical difference.
Which scale do scientists use?
Scientists use Celsius and Kelvin. Kelvin starts at absolute zero, so zero kelvin equals minus two hundred and seventy-three point one five degrees Celsius.
Why is body temperature sometimes given as 98.6?
It is the Fahrenheit equivalent of 37 degrees Celsius, the average normal body temperature measured in a famous nineteenth century study. Normal temperature actually varies between people and through the day, so a small difference is not a concern.
Built and reviewed by Hamza Farooq, founder and lead developer
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