Temperature Converter
Convert temperatures between Celsius, Fahrenheit, and Kelvin instantly. See the conversion formula used for each result.
About Temperature Converter
Our Temperature Converter allows you to quickly and accurately convert between the three most common temperature scales: Celsius, Fahrenheit, and Kelvin. Whether you're checking a recipe from another country, working on a science project, or just curious about weather reports from around the world, this tool makes conversion effortless.
The Celsius scale is used in most countries worldwide and is part of the metric system. The Fahrenheit scale is primarily used in the United States for everyday temperature measurements. The Kelvin scale is used in scientific contexts and starts at absolute zero, the theoretical lowest possible temperature.
This converter shows you the exact formula used for each conversion, so you can understand the math behind the result. All calculations happen instantly in your browser with no server requests, ensuring fast and private conversions every time.
Frequently Asked Questions
Q How do you convert Celsius to Fahrenheit?
To convert Celsius to Fahrenheit, multiply the Celsius temperature by 9/5 (or 1.8) and then add 32. The formula is: °F = (°C × 9/5) + 32. For example, 100°C = (100 × 1.8) + 32 = 212°F, which is the boiling point of water.
Q What is absolute zero in each scale?
Absolute zero is the lowest theoretically possible temperature, where all thermal motion ceases. In Celsius, it's -273.15°C. In Fahrenheit, it's -459.67°F. In Kelvin, it's simply 0 K, which is why the Kelvin scale is preferred in scientific contexts — it starts from the most fundamental reference point.
Q Why does the US use Fahrenheit?
The United States adopted the Fahrenheit scale in the 18th century through German-Dutch physicist Daniel Gabriel Fahrenheit's influence. Despite most of the world switching to Celsius as part of metrication, the US retained Fahrenheit for everyday use due to the cost and effort of converting infrastructure, public familiarity, and cultural inertia. Scientific and medical fields in the US do commonly use Celsius and Kelvin.