Convert between Celsius, Fahrenheit, and Kelvin instantly. Whether you need to check weather temperatures, adjust recipes, or work with scientific measurements, our fast, accurate tools have you covered.
All converters are free, require no sign-up, and work instantly in your browser. Simply enter a value, and the result updates as you type. Swap units with a single click.
Three temperature scales are widely used worldwide: Celsius (metric), Fahrenheit (imperial), and Kelvin (scientific). Celsius and Fahrenheit are used for everyday temperature measurement, while Kelvin is the standard in science and physics.
Celsius is used in most countries and is based on the freezing point (0°C) and boiling point (100°C) of water. Fahrenheit is primarily used in the United States and is based on different reference points. Kelvin is used in scientific contexts and starts at absolute zero.
Understanding these scales is important for weather, cooking, science, and travel. Our converters handle all common temperature conversions instantly and accurately.
Some key reference points to help you understand the three scales:
The formula is: °F = (°C × 9/5) + 32. For example, 20°C = (20 × 9/5) + 32 = 68°F.
Absolute zero is the lowest possible temperature in the universe, where all molecular motion stops. It equals -273.15°C, -459.67°F, and 0 Kelvin. Nothing can be colder than absolute zero.
Kelvin is an absolute temperature scale starting at absolute zero, making it ideal for science and physics calculations. Unlike Celsius and Fahrenheit, Kelvin doesn't have negative temperatures, and ratios of temperatures are physically meaningful.
Room temperature is approximately 20°C, 68°F, or 293.15 K. Some definitions use 21–23°C, but 20°C (68°F) is the standard reference point.
Yes, completely free. No sign up, no account, no limits. Just open and convert.