Celsius to Kelvin Converter °C → K
1 °C equals 274.15 K — note this scale uses an offset formula, not simple multiplication. Type a value below — the conversion happens instantly, entirely on your device.
25 °C = 298.15 K
25 degrees Celsius = 298.15 kelvins
25 × 1 + 273.15 = 298.15
These scales have different zero points, so the conversion multiplies by 1 and then shifts by +273.15.
How to convert degrees Celsius to kelvins
K = °C + 273.15 — add 273.15 to the Celsius temperature.
Example: 25 °C = 298.15 K.
To convert the other way: °C = K − 273.15 — or use the dedicated K to °C converter .
Celsius-to-Kelvin is a pure offset: add 273.15. Kelvin is required in science because it starts at absolute zero, making ratios of temperatures physically meaningful. Standard lab temperature of 25 °C is 298.15 K.
Celsius to Kelvin conversion table
| Celsius (°C) | Kelvin (K) |
|---|---|
| -273.15 | 0 |
| -100 | 173.15 |
| -40 | 233.15 |
| 0 | 273.15 |
| 20 | 293.15 |
| 25 | 298.15 |
| 37 | 310.15 |
| 100 | 373.15 |
| 1000 | 1273.15 |
About the units
What is the Celsius scale?
Degrees Celsius (°C) set 0° at the freezing point of water and 100° at its boiling point (at standard pressure). It is the everyday temperature scale in almost every country.
What is the Kelvin scale?
The kelvin (K) is the SI base unit of temperature, starting at absolute zero (0 K = −273.15 °C). A change of 1 K equals a change of 1 °C; kelvins are standard in science and engineering.
Frequently asked questions
How many kelvins are in 1 °C?
1 °C equals 274.15 K — note this scale uses an offset formula, not simple multiplication.
What is the formula to convert degrees Celsius to kelvins?
K = °C + 273.15 — add 273.15 to the Celsius temperature.
Is this °C-to-K converter accurate and private?
Yes. It uses the exact internationally defined conversion factors and computes results locally in your browser — your input is never sent to a server, and the page keeps working offline.