Converting temperatures from Kelvin to Celsius is straightforward: subtract 273.15 from the Kelvin value. The formula is: °C = K - 273.15. For example, 300 K equals 26.85 °C. The Kelvin scale starts at absolute zero (0 K), the point where molecular motion ceases, corresponding to -273.15 °C on the Celsius scale. Both scales share the same unit increment; a change of 1 K is equivalent to a change of 1 °C. While Celsius is commonly used in daily applications and weather reports, Kelvin is essential in scientific fields requiring absolute temperature measurements.