What is the Kelvin formula for converting Celsius to Kelvin?

• A. K = C - 273.15
• B. K = C × 273.15
• C. K = 273.15 + C
• D. K = 273.15 × C

Answer: (C)

To convert Celsius to Kelvin, you add 273.15 to the Celsius temperature. The Kelvin scale is offset from Celsius by 273.15 because absolute zero is -273.15°C. So the correct formula is K = C + 273.15. For example, 0°C is 273.15 K, and 25°C is 298.15 K. Subtracting or multiplying would not reflect the fixed offset between the two scales, so those options aren’t correct.