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Fahrenheit to Celsius
Fahrenheit to Celsius: type a value and read the result as you type, free and without signing up. The page also shows the value in every other temperature unit. Nothing is uploaded: the maths runs in your browser.
How to convert temperature units online
- 1Type the number you want to convert
- 2Check the units in From and To, or press Swap
- 3Read the result under the fields
- The converted value, plus every other unit.
What happens to your numbers
- Nothing is uploaded.The sum is done by your browser. The number you type never leaves your device.
- Exact formulas.Fahrenheit is Celsius × 9/5 + 32, and Kelvin is Celsius + 273.15.
- Works offline.Once the tool has been opened, it needs no connection.
What you can do
- Convert any value, including decimals and negative numbers. The result changes as you type.
- A worked example: 20 Fahrenheit = -6.66667 Celsius.
- Press Swap to turn the conversion around without retyping the number.
- See the same value in every other temperature unit in one table: Celsius, Fahrenheit and Kelvin.
- Check oven settings, weather and lab values, or move between everyday scales and the scientific Kelvin scale.
Good to know
- Fahrenheit puts the freezing point of water at 32 degrees and its boiling point at 212. It is the everyday scale in the US and a few other countries.
- Celsius sets 0 degrees at the freezing point of water and 100 at its boiling point (at sea level). It is the everyday scale in most countries.
- Results show up to 10 significant digits. Very large or very small values appear in exponent form, such as 1.500000e-7.
- Temperatures are converted by formula, not by one factor, and the value field starts at 20 as a typical room temperature. Absolute zero is 0 Kelvin, -273.15 Celsius and -459.67 Fahrenheit.
Questions
Is this temperature converter free?
Yes. It is free and needs no account or sign-up. Nothing you type is uploaded.
How exact is the result?
The formulas are exact: Fahrenheit = Celsius × 9/5 + 32 and Kelvin = Celsius + 273.15. The result shows up to 10 significant digits.
Can I convert temperatures below zero?
Yes. Type a negative number, for example -40. It is the same in Celsius and Fahrenheit.
Can I convert to a different unit?
Yes. Change the To unit, or read the table below the result, which lists the value in every other unit.