Our Celsius to Kelvin converter uses the internationally recognized scientific formula: K = °C + 273.15 – critical for absolute temperature measurements in physics, chemistry, and engineering.
Precision: 2 Decimal Places | Formula: K = °C + 273.15
Understand the science behind absolute temperature scales and accurate conversion methods.
Standard Scientific Formula:
Formula: K = °C + 273.15
1 Kelvin = 1 Celsius degree (temperature interval)
Reverse Conversion:
Formula: °C = K - 273.15
Note: Kelvin values cannot be negative (0 K = absolute zero)
1. Convert 25°C (room temperature) to Kelvin:
K = 25 + 273.15 = 298.15 K
2. Convert 0 K (absolute zero) to Celsius:
°C = 0 - 273.15 = -273.15 °C
Quick reference for common temperatures in scientific and everyday contexts.
| Celsius (°C) | Kelvin (K) | Common Context |
|---|---|---|
| -273.15 | 0 | Absolute zero (theoretical minimum temperature) |
| -196 | 77.15 | Boiling point of liquid nitrogen |
| -100 | 173.15 | Extreme cold (polar regions record low) |
| -40 | 233.15 | Celsius-Fahrenheit equivalence (-40°C = -40°F) |
| 0 | 273.15 | Water freezing point (1 atm pressure) |
| 25 | 298.15 | Standard room temperature |
| 37 | 310.15 | Human body temperature (average) |
| 100 | 373.15 | Water boiling point (1 atm pressure) |
| 200 | 473.15 | Oven temperature (baking) |
| 1000 | 1273.15 | Temperature of red-hot metal |
Note: All values are based on standard atmospheric pressure (1 atmosphere = 101.325 kPa). Temperature values may vary slightly at different pressures (e.g., high altitude boiling points).
Answers to common questions about Celsius to Kelvin conversion and temperature scales.
The value 273.15 comes from the definition of absolute zero, the lowest possible temperature in the universe. By international scientific agreement, absolute zero is defined as exactly -273.15°C, which corresponds to 0 K on the Kelvin scale. This precise offset ensures consistency in scientific measurements worldwide.
Historically, the Kelvin scale was defined based on the triple point of water (0.01°C = 273.16 K), but the modern definition (2019 redefinition of SI units) fixes the Boltzmann constant, which indirectly maintains the 273.15 offset for practical purposes.
Kelvin is an absolute temperature scale, meaning it measures temperature relative to absolute zero—the theoretical point where all molecular motion ceases. At absolute zero (0 K), there is no thermal energy left to remove from a system.
Negative temperatures would imply a system with less than zero thermal energy, which is physically impossible according to the laws of thermodynamics. In contrast, Celsius is a relative scale (based on water's properties), so negative values simply mean temperatures below water's freezing point.
Kelvin is required for any scientific or engineering calculation where absolute temperature values matter, including:
Celsius is more appropriate for everyday use (weather, cooking, household temperatures) and situations where relative temperature differences are sufficient.
The required precision depends on your application:
This converter uses the standard 273.15 offset, which is accepted in nearly all scientific contexts. You can adjust the decimal precision (0-4 places) to match your specific needs.
Both Kelvin and Rankine are absolute temperature scales (no negative values), but they use different size intervals and reference points:
Conversion between scales: K = °R × 5/9 | °R = K × 9/5. For most scientific applications, Kelvin is the standard absolute scale.
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