Temperature Converter
Convert between Celsius, Fahrenheit, and Kelvin in real-time.
What is a Temperature Converter?
This tool converts between Fahrenheit, Celsius, and Kelvin-the three most common temperature scales. Celsius is used by most of the world for everyday weather and cooking, Fahrenheit is primarily used in the United States, and Kelvin is the SI unit used in scientific contexts where absolute zero (0 K = −273.15°C) serves as the baseline.
How to Use
- Select the temperature scale you're converting from.
- Enter the temperature value you want to convert.
- View the equivalent values in the other two scales, along with the conversion formulas used.
Frequently Asked Questions
Why does the US use Fahrenheit?
The Fahrenheit scale was created by Daniel Fahrenheit in 1724 and was widely adopted in English-speaking countries. While most nations switched to Celsius during metrication in the 20th century, the US retained Fahrenheit for everyday use due to familiarity and the cost of transition. Some argue Fahrenheit is more intuitive for weather since its 0–100 range roughly corresponds to the extremes of human-habitable temperatures. Only the US, the Bahamas, Palau, and the Cayman Islands still use Fahrenheit as their primary scale.
What is absolute zero?
Absolute zero (0 K, −273.15°C, −459.67°F) is the theoretical lowest temperature where all molecular motion ceases. It cannot actually be reached but has been approached to within billionths of a degree in laboratory settings. The Kelvin scale starts at absolute zero, making it essential for scientific calculations involving gas laws, thermal radiation, and thermodynamic efficiency. The coldest natural temperature recorded in the universe is about 1 K in the Boomerang Nebula.
At what temperature are Fahrenheit and Celsius equal?
The two scales intersect at −40°. That is, −40°F = −40°C exactly. This is derived from solving the conversion formula °F = (°C × 9/5) + 32 where both sides are equal. This temperature is actually experienced in places like northern Canada and Siberia during winter. Another useful reference point: 28°C = 82°F (just swap the digits), which is a handy mental shortcut for warm weather conversions.
