🇺🇸 Fahrenheit and Celsius Converter Online
Convert Fahrenheit to Celsius and back online for free. Get exact temperature conversions with the standard formulas and a quick reference table you can use
What is this tool?
This converter changes temperatures between Fahrenheit, Celsius and Kelvin.How it works
It uses the standard formulas: °C = (°F − 32) × 5/9 and °F = °C × 9/5 + 32.Common reference points
Everyday temperatures and their values.
| Unit | °F | °C |
|---|---|---|
| Water freezes | 32 | 0 |
| Water boils | 212 | 100 |
| Body temperature | 98.6 | 37 |
| Room temperature | 68 | 20 |
| Absolute zero | -459.67 | -273.15 |
Conversion formulas
The math behind the conversion.
| Conversion | Formula |
|---|---|
| °F → °C | (°F − 32) × 5/9 |
| °C → °F | °C × 9/5 + 32 |
| °C → K | °C + 273.15 |
How to use
- Enter a value, choose a unit, see the result.
Frequently Asked Questions
What is the formula to convert Fahrenheit to Celsius?
Subtract 32, then multiply by 5/9: °C = (°F − 32) × 5/9.
Which countries use Fahrenheit?
The United States and a few Caribbean nations mainly use Fahrenheit; most of the world uses Celsius.
What is absolute zero in Fahrenheit?
Absolute zero is −459.67 °F, which equals −273.15 °C and 0 K.
Tips & Advice
Fahrenheit is common in the U.S.; most of the world uses Celsius.Related Tools
Sources & References
Last reviewed: September 2026.
- National Institute of Standards and Technology (NIST) – SI Units – Temperature.
Limitations
Converts between Fahrenheit, Celsius and Kelvin using the exact formulas (°C = (°F − 32) × 5/9; °F = °C × 9/5 + 32). Results are rounded for display, so converting back and forth can drift by a fraction of a degree. It is a unit converter only and does not model measurement uncertainty, sensor error or significant-figure rules.