Convert Celsius to Kelvin
1 Celsius (°C) = 274.15 Kelvin (K). Use the free converter below to instantly convert any celsius value to kelvin, or view the full conversion table and formula.
1 °C = 274.15 K
Celsius to Kelvin Conversion Table
How to Convert Celsius to Kelvin
To convert Celsius to Kelvin, add 273.15 to the Celsius temperature. The Kelvin scale starts at absolute zero (-273.15°C), so 0°C = 273.15 K. For example, room temperature of 25°C = 25 + 273.15 = 298.15 K. This is a simple offset — a 1-degree change in Celsius equals a 1-degree change in Kelvin.
Worked Example: Convert -20 °C to K
Start with the value in celsius
-20 °C
Apply the formula
K = -20 + 273.15
Calculate the result
-20 °C = 253.15 K
Celsius to Kelvin Examples
-273.15 °C is equal to 0 K. Using the formula °C + 273.15, -273.15 °C converts to 0 K.
-100 °C is equal to 173.15 K. Using the formula °C + 273.15, -100 °C converts to 173.15 K.
-40 °C is equal to 233.15 K. Using the formula °C + 273.15, -40 °C converts to 233.15 K.
-20 °C is equal to 253.15 K. Using the formula °C + 273.15, -20 °C converts to 253.15 K.
0 °C is equal to 273.15 K. Using the formula °C + 273.15, 0 °C converts to 273.15 K.
10 °C is equal to 283.15 K. Using the formula °C + 273.15, 10 °C converts to 283.15 K.
20 °C is equal to 293.15 K. Using the formula °C + 273.15, 20 °C converts to 293.15 K.
25 °C is equal to 298.15 K. Using the formula °C + 273.15, 25 °C converts to 298.15 K.
Converting Kelvin to Celsius
Need the reverse conversion? Use the table below for a quick reference converting kelvin back to celsius.
| Kelvin (K) | Celsius (°C) |
|---|---|
| 0 | -273.15 |
| 77 | -196.15 |
| 100 | -173.15 |
| 173 | -100.15 |
| 233 | -40.15 |
| 253 | -20.15 |
Celsius to Kelvin FAQ
What is 0°C in Kelvin?
0°C equals 273.15 K. This is the freezing point of water at standard pressure.
What is absolute zero in Celsius?
Absolute zero is 0 K, which equals -273.15°C. It is the lowest possible temperature.
How do I convert Celsius to Kelvin?
Add 273.15 to the Celsius temperature. For example, 25°C + 273.15 = 298.15 K.
Understanding Celsius and Kelvin
What is a Celsius (°C)?
The celsius (°C) is a unit of temperature in the metric system. It is commonly abbreviated as °C and relates to kelvin by a factor of 274.15.
What is a Kelvin (K)?
The kelvin (K) is a unit of temperature in the metric system. It is commonly abbreviated as K and relates to celsius by a factor of -272.15.