Temperature Converter
Convert temperatures between Celsius, Fahrenheit, Kelvin, Rankine, and Reaumur with all conversions shown at once.
Related Tools
Frequently Asked Questions
What is the formula for Celsius to Fahrenheit?
°F = (°C × 9/5) + 32. For example, 100°C = (100 × 1.8) + 32 = 212°F.
What is absolute zero?
Absolute zero is the lowest theoretically possible temperature: 0 K = −273.15°C = −459.67°F. At this temperature, particles have minimal thermal motion.
When is Kelvin used instead of Celsius?
Kelvin is used in scientific and engineering contexts where absolute temperature matters, such as thermodynamics, astrophysics, and materials science. Kelvin has no negative values.