Convert Fahrenheit to Celsius
Instantly convert Fahrenheit (°F) to Celsius (°C) with our free online calculator.
Formula: °F to °C — (°F − 32) × 5/9
Reference Table
| Fahrenheit (°F) | Celsius (°C) |
|---|---|
| 1 | -17.2222 |
| 5 | -15 |
| 10 | -12.2222 |
| 25 | -3.88889 |
| 50 | 10 |
| 100 | 37.7778 |
Fahrenheit-to-celsius conversion is essential for international travelers reading US weather reports, patients reviewing US medical records (normal body temperature 98.6°F = 37°C), and home cooks adapting US recipes. The formula °C = (°F − 32) × 5/9 captures both scales' different degree sizes (1°C = 1.8°F). A comfortable 72°F room is 22.2°C; a "100-degree" US heat wave is 37.8°C; freezing 32°F is exactly 0°C — a useful landmark for anyone learning the conversion.
How to Convert Fahrenheit to Celsius
Formula
To convert Fahrenheit (°F) to Celsius (°C): (°F − 32) × 5/9
Step-by-Step
- Start with your value in Fahrenheit (°F).
- (°F − 32) × 5/9 to perform the conversion.
- The result is your value expressed in Celsius (°C).
Conversion Factor
1 °F = -17.2222 °C
Reverse Factor
1 °C = 33.8 °F
Worked Example
Convert 25 Fahrenheit to Celsius: 25 °F = -3.88889 °C
About Fahrenheit (°F)
A temperature scale introduced by physicist Daniel Gabriel Fahrenheit in 1724, on which water freezes at 32° and boils at 212° under standard atmospheric pressure. Fahrenheit remains the dominant temperature scale in the United States for weather reporting, oven and cooking temperatures, and HVAC settings. The smaller degree interval (5°F ≈ 2.78°C) gives more precision in everyday conversation about weather — partly why American forecasters and thermostats still prefer it despite global metric adoption.
About Celsius (°C)
A temperature scale on which water freezes at 0° and boils at 100° under standard atmospheric pressure, devised by Swedish astronomer Anders Celsius in 1742. Celsius is the global standard for weather forecasts, cooking, human body temperature (normal ~37°C), and most scientific measurement outside the US. Because its degree interval is identical to the kelvin, Celsius is the everyday face of SI temperature: scientists and laypeople alike use it without any conversion penalty.
Quick Facts
- 1 Fahrenheit equals -17.2222 Celsius
- 1 Celsius equals 33.8 Fahrenheit
- Fahrenheit is a unit of temperature
- Celsius is a unit of temperature
- This conversion is commonly used in weather forecasting, cooking, scientific experiments, and HVAC
- The Fahrenheit belongs to the imperial system
- The Celsius belongs to the metric system
Common Fahrenheit to Celsius Conversions
| Fahrenheit (°F) | Celsius (°C) |
|---|---|
| -40 | -40 |
| -20 | -28.8889 |
| -10 | -23.3333 |
| 0 | -17.7778 |
| 5 | -15 |
| 10 | -12.2222 |
| 15 | -9.44444 |
| 20 | -6.66667 |
| 25 | -3.88889 |
| 30 | -1.11111 |
| 35 | 1.66667 |
| 37 | 2.77778 |
| 40 | 4.44444 |
| 50 | 10 |
| 60 | 15.5556 |
| 70 | 21.1111 |
| 80 | 26.6667 |
| 90 | 32.2222 |
| 100 | 37.7778 |
| 150 | 65.5556 |
| 200 | 93.3333 |
Understanding Fahrenheit
The Fahrenheit (symbol: °F) is a unit of temperature. A temperature scale introduced by physicist Daniel Gabriel Fahrenheit in 1724, on which water freezes at 32° and boils at 212° under standard atmospheric pressure. Fahrenheit remains the dominant temperature scale in the United States for weather reporting, oven and cooking temperatures, and HVAC settings. The smaller degree interval (5°F ≈ 2.78°C) gives more precision in everyday conversation about weather — partly why American forecasters and thermostats still prefer it despite global metric adoption.
It belongs to the imperial measurement system.
Fahrenheit are commonly used in weather forecasting, cooking, scientific experiments, and HVAC.
Understanding Celsius
The Celsius (symbol: °C) is a unit of temperature. A temperature scale on which water freezes at 0° and boils at 100° under standard atmospheric pressure, devised by Swedish astronomer Anders Celsius in 1742. Celsius is the global standard for weather forecasts, cooking, human body temperature (normal ~37°C), and most scientific measurement outside the US. Because its degree interval is identical to the kelvin, Celsius is the everyday face of SI temperature: scientists and laypeople alike use it without any conversion penalty.
It belongs to the metric measurement system.
Celsius are commonly used in weather forecasting, cooking, scientific experiments, and HVAC.
Why Convert Fahrenheit to Celsius?
Converting between Fahrenheit and Celsius is essential for a variety of everyday and professional tasks. International recipes list oven temperatures in different scales, weather reports from other countries use unfamiliar units, and scientists must reconcile data recorded under different conventions. Medical professionals also compare body temperature readings that may be reported in different units depending on the country or device.
Frequently Asked Questions
How do I convert Fahrenheit to Celsius?
A temperature scale introduced by physicist Daniel Gabriel Fahrenheit in 1724, on which water freezes at 32° and boils at 212° under standard atmospheric pressure. To convert Fahrenheit to Celsius, (°F − 32) × 5/9. For example, 25 °F equals -3.88889 °C.
How many Celsius are in 1 Fahrenheit?
There are -17.2222 Celsius in 1 Fahrenheit.
How many Fahrenheit are in 1 Celsius?
There are 33.8 Fahrenheit in 1 Celsius.
What is the formula for Fahrenheit to Celsius conversion?
The formula is: (°F − 32) × 5/9. This means 1 °F = -17.2222 °C.
Is a Fahrenheit bigger than a Celsius?
Yes. One Fahrenheit is larger than one Celsius because 1 °F equals -17.2222 °C, which is less than 1.
When do you need to convert between Fahrenheit and Celsius?
A temperature scale on which water freezes at 0° and boils at 100° under standard atmospheric pressure, devised by Swedish astronomer Anders Celsius in 1742. Fahrenheit and Celsius are both temperature units, so conversion comes up whenever one source of information uses one unit and another uses the other — a classic cross-reference challenge in engineering, trade, travel, and everyday life.