Celsius to Kelvin Conversion Chart
| Celsius (°C) | Kelvin (K) | Reference Benchmark | Formula Step |
|---|---|---|---|
| -273.15 °C | 0 K | Absolute Zero (Zero Molecular Motion) | -273.15 + 273.15 = 0 K |
| -196 °C | 77.15 K | Liquid Nitrogen Boiling Point | -196 + 273.15 = 77.15 K |
| -78.5 °C | 194.65 K | Dry Ice (Solid CO2) Sublimation | -78.5 + 273.15 = 194.65 K |
| -40 °C | 233.15 K | Celsius & Fahrenheit Equal Point | -40 + 273.15 = 233.15 K |
| -18 °C | 255.15 K | Standard Commercial Deep Freezer | -18 + 273.15 = 255.15 K |
| 0 °C | 273.15 K | Freezing Point of Pure Water (1 atm) | 0 + 273.15 = 273.15 K |
| 15 °C | 288.15 K | ICAO Standard Atmosphere Sea Level | 15 + 273.15 = 288.15 K |
| 20 °C | 293.15 K | Standard Lab Room Temperature | 20 + 273.15 = 293.15 K |
| 22 °C | 295.15 K | Optimal Office Living Climate | 22 + 273.15 = 295.15 K |
| 25 °C | 298.15 K | IUPAC Standard Ambient Temperature | 25 + 273.15 = 298.15 K |
| 37 °C | 310.15 K | Normal Human Body Temperature | 37 + 273.15 = 310.15 K |
| 40 °C | 313.15 K | Severe Clinical Fever Threshold | 40 + 273.15 = 313.15 K |
| 100 °C | 373.15 K | Boiling Point of Water (1 atm) | 100 + 273.15 = 373.15 K |
| 180 °C | 453.15 K | Moderate European Oven Baking | 180 + 273.15 = 453.15 K |
| 200 °C | 473.15 K | Hot Culinary Roasting Setting | 200 + 273.15 = 473.15 K |
| 500 °C | 773.15 K | Lead Melting Point (Approximate) | 500 + 273.15 = 773.15 K |
| 1000 °C | 1273.15 K | Industrial Metal Annealing Furnace | 1000 + 273.15 = 1273.15 K |
Celsius to Kelvin Formula & Unit Definitions
Because the unit scale size is identical (1:1 ratio), there is no fractional multiplication (no 1.8 multiplier). The formula is a pure additive linear translation: K = °C + 273.15. To find thermodynamic absolute temperature, simply add 273.15 to your Celsius reading.
Quick Estimation: Add 273 to the Celsius value for a quick mental estimate (e.g., 20°C + 273 = 293 K, exact is 293.15 K).
Celsius Scale (°C)
Everyday Metric Scale- Creator & Origin: Proposed by Anders Celsius in 1742 as a centigrade scale defined between the freezing (0°C) and boiling (100°C) points of water.
- Relative Baseline: Anchored to earthly physical properties of water; permits negative values for freezing weather and cryogenics.
- Daily Application: Used by meteorologists, civil infrastructure, culinary recipes, and medical diagnostics worldwide.
Kelvin Scale (K)
SI Base Unit- Creator & Origin: Established by physicist William Thomson (1st Baron Kelvin) in 1848 based on absolute thermodynamic entropy.
- Absolute Zero: 0 K represents absolute zero: the theoretical temperature where enthalpy and entropy of a cooled ideal gas reach minimum value.
- No Degree Symbol: Written simply as 'K' (not °K), as Kelvin is an absolute fundamental SI base dimension, not a relative scale.
Frequently Asked Questions
Q.What is the exact formula to convert Celsius to Kelvin?
The official formula is K = °C + 273.15. Because the degree increment of Celsius is identical to the kelvin, you simply add 273.15 to shift the zero point. To convert in the opposite direction, use our Kelvin to Celsius converter.
Q.Why is there no degree symbol (° ) used with Kelvin?
Unlike Celsius and Fahrenheit which are relative scales, Kelvin is an absolute thermodynamic scale and an official SI base unit. Therefore, temperatures in Kelvin are written simply as 'K' (e.g., 300 K, not 300°K).
Q.What is 0°C in Kelvin?
0°C equals exactly 273.15 K. This represents the freezing point of pure water at standard atmospheric pressure (1 atm).
Q.What is 20°C room temperature in Kelvin?
20°C equals exactly 293.15 K (20 + 273.15 = 293.15 K). This is the standard room temperature baseline used in physics and chemical experiments.
Q.What is absolute zero in Celsius?
Absolute zero (0 K) equals exactly −273.15°C. At this temperature, all classical molecular kinetic energy reaches its minimum possible state.
Q.Can Kelvin temperatures be negative?
Under classical thermodynamics, Kelvin cannot be negative because 0 K is the absolute lower limit of temperature. While specialized quantum systems can exhibit effective negative Kelvin spin temperatures, everyday physical matter cannot drop below 0 K.