How to convert celsius to kelvin
Apply the documented celsius-to-kelvin relationship below, keeping the full stored constant until the displayed result is rounded.
Kelvin = Celsius + 273.15
For example, 10 °C equals 283.15 K.
Celsius to Kelvin reference table
| Celsius | Kelvin |
|---|---|
| 1 °C | 274.15 K |
| 5 °C | 278.15 K |
| 10 °C | 283.15 K |
| 25 °C | 298.15 K |
| 50 °C | 323.15 K |
| 100 °C | 373.15 K |
Method and quality checks
- Calculation
- Kelvin = Celsius + 273.15. The calculator keeps the stored factor through the operation and rounds only the displayed result to the selected or page-supported precision.
- Unit convention
- This is a point-temperature conversion, so the scale offset is included. Temperature intervals use a different rule.
- Input validation
- Finite numeric inputs are accepted, while values below absolute zero for the source scale are rejected.
- Reasonableness check
- 10 °C produces 283.15 K. Check the direction and approximate scale before relying on a more precise displayed value.
Deeper method: Temperature scales compared.
Celsius and kelvin share the same interval size
A temperature change of 1 degree Celsius has the same size as a change of 1 kelvin. The scales differ only in origin: add exactly 273.15 to a Celsius temperature to express it in kelvins, so 0 °C equals 273.15 K.
- Write kelvin values with K, not a degree sign.
- A Celsius temperature below −273.15 °C would convert below absolute zero and is not physically valid.
- For temperature differences, the numerical values in degrees Celsius and kelvins are identical.
Reference: NIST: Kelvin introduction.