Celsius to Kelvin Converter (°C to K)
Kelvin uses the same degree size as Celsius but starts at absolute zero, so converting only means adding 273.15. It is the standard temperature unit in physics, thermodynamics and PV cell modelling.
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1 °C = 274.15 K
Calculation working
- Absolute temperature: convert through Celsius; temperature differences use a different rule.
- 1 °C
- 1 + 273.15 = 274.15 K
Display: 10 significant digits. More digits do not make the original measurement more accurate.
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Batch conversion
One value per line, up to 200. Uses the selected °C → K units. Invalid rows stay visible in the results and CSV.
Compare all units
Using this temperature converter
Convert absolute readings from weather reports, thermometers and equipment temperature limits.
These scales have different zero points. A temperature reading and a temperature rise are different quantities: a 10 °C rise is 18 °F, while an absolute reading of 10 °C is 50 °F.
Check before using the result
- Readings below absolute zero are rejected. Negative Celsius and Fahrenheit values can still be physically valid.
- Do not use this absolute-reading converter for a temperature difference, thermal rise or coefficient correction. Kelvin has no degree sign.
Definitions and method: NIST: unit conversion factors and rounding. Calculations use double-precision arithmetic; the display precision can be adjusted above.
Celsius to Kelvin conversion chart
| Celsius (°C) | Kelvin (K) |
|---|---|
| -273.15 | 0 |
| -40 | 233.15 |
| -10 | 263.15 |
| 0 | 273.15 |
| 10 | 283.15 |
| 20 | 293.15 |
| 25 | 298.15 |
| 37 | 310.15 |
| 50 | 323.15 |
| 100 | 373.15 |
| 200 | 473.15 |
| 1,000 | 1,273.15 |
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