Unit Converter
Celsius to Kelvin Converter
Convert Celsius to Kelvin instantly. Use the formula K = °C + 273.15. Example: 1 °C = 274.15 K. Free, accurate, client-side.
Kelvin
274.15 K
1 °C = 274.15 K
Celsius to Kelvin formula
K = °C + 273.15Kelvin is the absolute temperature scale used in physics and chemistry, while Celsius is the everyday scale where 0°C is water's freezing point. The conversion factor 273.15 reflects the zero-point offset between scales: absolute zero (0 K) equals −273.15°C, so adding 273.15 to any Celsius value gives its Kelvin equivalent.
Celsius to Kelvin conversion table
| Celsius (°C) | Kelvin (K) |
|---|---|
| -40 °C | 233.15 K |
| -20 °C | 253.15 K |
| -10 °C | 263.15 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 |
| 40 °C | 313.15 K |
| 50 °C | 323.15 K |
| 100 °C | 373.15 K |
When you need to convert celsius to kelvin
- Physics and chemistry experiments requiring absolute temperature for gas laws and thermodynamic calculations
- Cooking and kitchen use when recipes specify temperatures in Kelvin or when working with industrial ovens
- Astronomy and astrophysics work where stellar temperatures and cosmic phenomena are measured in Kelvin
- Laboratory and scientific research where precise temperature control demands the absolute scale
- Engineering and manufacturing processes involving materials science and high-temperature equipment
Frequently asked questions
Why do physicists use Kelvin instead of Celsius?
Kelvin is an absolute scale starting at zero energy, making it essential for gas laws, thermodynamics, and equations where temperature ratios matter. Celsius's arbitrary zero point makes calculations awkward in physics.
Is there a quick mental trick to convert Celsius to Kelvin?
Add 273 for rough estimates; use 273.15 for accuracy. Room temperature around 20°C becomes 293 K. Water boils at 100°C = 373 K. Absolute zero is −273.15°C = 0 K.
Can Kelvin be negative?
No. Kelvin starts at absolute zero (0 K) and only increases. Negative Kelvin temperatures are physically impossible under normal circumstances, making it the true absolute scale.