Convert Celsius to Kelvin
Live bidirectional calculator for Celsius (°C) and Kelvin (K) with verified formula and conversion charts.
Temperature4 units
How the Calculation Works (Affine Transformation)
Add 273.15 to convert from the relative Celsius scale to the absolute thermodynamic Kelvin scale.
Celsius to Kelvin Conversion Table
Precomputed values for quick reference and printing.
| Celsius | Kelvin |
|---|---|
| 1 °C | 274.15 K |
| 2 °C | 275.15 K |
| 3 °C | 276.15 K |
| 4 °C | 277.15 K |
| 5 °C | 278.15 K |
| 6 °C | 279.15 K |
| 7 °C | 280.15 K |
| 8 °C | 281.15 K |
| 9 °C | 282.15 K |
| 10 °C | 283.15 K |
| 15 °C | 288.15 K |
| 20 °C | 293.15 K |
| 25 °C | 298.15 K |
| 30 °C | 303.15 K |
| 40 °C | 313.15 K |
| 50 °C | 323.15 K |
| 75 °C | 348.15 K |
| 100 °C | 373.15 K |
| Kelvin | Celsius |
|---|---|
| 1 K | -272.15 °C |
| 2 K | -271.15 °C |
| 3 K | -270.15 °C |
| 4 K | -269.15 °C |
| 5 K | -268.15 °C |
| 6 K | -267.15 °C |
| 7 K | -266.15 °C |
| 8 K | -265.15 °C |
| 9 K | -264.15 °C |
| 10 K | -263.15 °C |
| 15 K | -258.15 °C |
| 20 K | -253.15 °C |
| 25 K | -248.15 °C |
| 30 K | -243.15 °C |
| 40 K | -233.15 °C |
| 50 K | -223.15 °C |
| 75 K | -198.15 °C |
| 100 K | -173.15 °C |
📌 Standard Benchmark Reference Values
Absolute zero (thermodynamic minimum).
Exact RatioTriple point of water.
Exact RatioAbout Celsius (°C)
The Celsius scale is defined so that 0 °C is the freezing point of water and 100 °C is the boiling point of water at standard atmospheric pressure.
History: Proposed by Anders Celsius in 1742 (originally inverted). The modern direction was established by Carl Linnaeus. Renamed from "centigrade" to "Celsius" in 1948 by the 9th CGPM.
Common Uses: Daily weather, cooking, scientific measurement, and industrial processes worldwide (except the US for everyday use).
About Kelvin (K)
The kelvin is the SI base unit of thermodynamic temperature. It is defined by setting the Boltzmann constant to exactly 1.380649 × 10⁻²³ J/K. 0 K is absolute zero.
History: Named after Lord Kelvin (William Thomson), who proposed the absolute temperature scale in 1848. Adopted as an SI base unit in 1954.
Common Uses: Physics, chemistry, engineering, color temperature in photography and lighting, and cryogenics.
❓ Frequently Asked Questions
What is 1 °C in K?
1 Celsius (°C) is equal to 274.15 Kelvin (K). Unlike linear units, temperature scales have differing zero offsets.
What is the formula to convert Celsius to Kelvin?
The formula is: K = °C + 273.15. Add 273.15 to convert from the relative Celsius scale to the absolute thermodynamic Kelvin scale.
How do I convert 1 °C to K manually?
To convert 1 °C to K: apply the formula K = °C + 273.15. Substituting gives: 1 + 273.15 = 274.15 K.