Convert Kelvin to Celsius
Convert Kelvin (K) to Celsius (°C) instantly and accurately.
Conversion Formula
°C = K − 273.15
About Kelvin
Kelvin (K) is the base unit of thermodynamic temperature in the International System of Units (SI), named after British physicist Lord Kelvin (William Thomson). It starts at absolute zero (0 K = -273.15°C), the theoretical point where all molecular motion ceases. Unlike other scales, Kelvin uses no degree symbol. This scale is essential in physics, chemistry, and astronomy: room temperature is about 295 K, water freezes at 273.15 K, and the Sun's surface is approximately 5,778 K. It's used in scientific calculations because it's directly proportional to molecular kinetic energy.
About Celsius
Celsius (°C) is the most widely used temperature scale worldwide, named after Swedish astronomer Anders Celsius (1742). It's based on the freezing point of water at 0°C and boiling point at 100°C under standard atmospheric pressure (1 atmosphere). This makes it intuitive for daily use: room temperature is around 20-22°C, body temperature is 37°C, and a hot summer day might reach 35-40°C. It's the standard in science, medicine, and weather reporting in most countries.
Quick Reference Table
| Kelvin (K) | Celsius (°C) |
|---|---|
| 233 K | -40.15 °C |
| 273 K | -0.15 °C |
| 293 K | 19.85 °C |
| 310 K | 36.85 °C |
| 373 K | 99.85 °C |
| 473 K | 199.85 °C |