Introduction
This Fahrenheit to Celsius calculator lets you convert temperatures between °F and °C in seconds. Just type in a number, and the tool does the math for you. It shows the answer right away, along with a step-by-step breakdown of how the conversion works.
Fahrenheit and Celsius are two scales used to measure temperature. The United States mainly uses Fahrenheit, while most other countries use Celsius. The formula to convert Fahrenheit to Celsius is simple: subtract 32 from the Fahrenheit value, then divide by 1.8. For example, 32°F equals 0°C, which is the point where water freezes.
You can also swap the direction and convert Celsius to Fahrenheit with one click. The calculator includes a chart that plots the conversion line, a reference table of common temperatures, and clear steps so you can follow the math on your own. Whether you need it for school, travel, cooking, or science, this tool gives you a fast and accurate answer every time.
How to Use Our Fahrenheit to Celsius Calculator
Type a temperature value and this calculator will convert it for you. It shows the answer, the math steps, a chart, and a reference table.
Enter a temperature: Type the number you want to convert into the input field on the left. The calculator starts in Fahrenheit (°F) by default.
Change the sign: Click the ± button to switch your number between positive and negative. Use this for below-zero temperatures.
Swap the direction: Click the swap button in the middle to switch between Fahrenheit to Celsius and Celsius to Fahrenheit.
Get your result: Click the Calculate button to see the converted temperature. The answer appears on the right and in the result box below.
Start over: Click the Reset button to clear your work and go back to the default value of 32°F.
How to Convert Fahrenheit to Celsius
Fahrenheit and Celsius are two scales used to measure temperature. Fahrenheit (°F) is mostly used in the United States. Celsius (°C) is used in most other countries around the world. Both scales tell you how hot or cold something is, but they use different numbers to do it.
The Conversion Formula
To change Fahrenheit to Celsius, subtract 32 from the Fahrenheit number, then divide by 1.8. The formula looks like this:
°C = (°F − 32) ÷ 1.8
To go the other way and change Celsius to Fahrenheit, multiply the Celsius number by 1.8, then add 32:
°F = (°C × 1.8) + 32
Key Temperatures to Know
Some temperatures are helpful to remember. Water freezes at 32°F, which is 0°C. Water boils at 212°F, which is 100°C. Normal human body temperature is about 98.6°F, or 37°C. Room temperature is around 72°F, or about 22°C.
Why Two Scales Exist
Daniel Gabriel Fahrenheit created the Fahrenheit scale in 1724. He based it on three fixed points, including the temperature of a salt and ice mixture. Anders Celsius created the Celsius scale in 1742. He based it on water — 0 for freezing and 100 for boiling. Because the Celsius scale ties directly to water, most scientists and most countries prefer it. The Celsius scale is also part of the metric system, which is why it pairs well with tools like the meters to feet calculator when working across measurement systems.
When You Need to Convert
You may need to convert temperatures when you travel, cook with a recipe from another country, or read weather reports from places that use a different scale. Temperature conversions also come up when calculating values like the heat index, the wind chill, or the dew point, since these formulas often require consistent units. In science and engineering, accurate temperature values are essential for calculations involving thermal expansion or the ideal gas law. This calculator does the math for you instantly and shows each step so you can learn how it works.