Celsius to Kelvin
Convert Celsius (°C) to Kelvin (K). K = °C + 273.15. Runs locally in your browser.
Celsius to Kelvin table
| Celsius | Kelvin |
|---|---|
| -40 °C | 233.15 K |
| 0 °C | 273.15 K |
| 10 °C | 283.15 K |
| 20 °C | 293.15 K |
| 25 °C | 298.15 K |
| 30 °C | 303.15 K |
| 37 °C | 310.15 K |
| 50 °C | 323.15 K |
| 100 °C | 373.15 K |
Where this conversion shows up
This is the science-class conversion. Gas laws, thermodynamics and chemistry equations need absolute temperature — kelvin — because doubling the temperature only doubles the energy if your zero is true zero. Everyday Celsius readings must be shifted before they go into any formula.
Worked example
A lab at 25 °C: 25 + 273.15 = 298.15 K, the standard temperature in chemistry. Water boils at 100 °C = 373.15 K, and absolute zero is 0 K = −273.15 °C.
Rounding and precision
The shift is exact — just addition, no scaling — so kelvin values carry the same precision as the Celsius reading. Note the style rule: kelvin takes no degree sign (298 K, not 298 °K), and the unit is lowercase when written out.
FAQ
What is the formula to convert Celsius to Kelvin?
K = °C + 273.15. For example, 25 °C = 298.15 K.
Is Celsius to Kelvin done in my browser?
Yes — the conversion runs locally; nothing is uploaded.
Why add exactly 273.15?
Absolute zero — where particles have minimal thermal energy — sits at −273.15 °C. The kelvin scale starts there and uses the same step size as Celsius, so converting is a pure offset.
Can a temperature in kelvin be negative?
No. Zero kelvin is absolute zero, the floor of the scale, so ordinary temperatures are always positive. (Negative-kelvin states in physics papers are exotic population inversions, not "colder than zero".)