Convert Celsius (°C) (celsius) to Kelvin (K) (kelvin)
Category: Temperature
0 celsius = 273.15 kelvin
High-precision rounding: 6 decimals
How to convert celsius (°c) to kelvin (k)
We convert by pivoting through the SI base unit for Temperature and applying exact factors where applicable.
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Quick conversion table
Handy values for Celsius (°C) → Kelvin (K). Click a value to open that exact result.
Conversion formula
Use the exact formula:
K = °C + 273.15
Temperature conversions use exact affine formulas (ratio + offset).
Common mistakes
- Using only a ratio (×1.8 or ×0.555…) without adding/subtracting the offset (±32, +273.15).
- Rounding too early; convert first, then round to the desired precision.
Unit facts
- Celsius (°C): Celsius (°C) is an offset scale: 0 °C at water’s freezing point, 100 °C at boiling (1 atm).
- Kelvin (K): Kelvin (K) is the absolute thermodynamic scale; SI base unit for temperature.
About Temperature
Temperature scales combine ratios and offsets. Kelvin is absolute (no negative values), Celsius offsets Kelvin by 273.15, and Fahrenheit uses a different step and zero point. Because offsets exist, temperature conversions require both a factor and an addition/subtraction.
About Celsius (°C)
Celsius (°C)
Offset scale with 0 °C at water’s freezing point and 100 °C at boiling (at 1 atm). Converts to Kelvin by adding 273.15. Widely used in daily weather and science.
History: Named for Anders Celsius (1740s). Redefined through absolute thermodynamic scales as metrology advanced.
About Kelvin (K)
Kelvin (K)
Absolute SI scale starting at 0 K with no negative values. Used for thermodynamics, cryogenics, and color temperature (K).
History: Defined via the Boltzmann constant since 2019, linking temperature directly to energy at the particle level.
Related conversions from celsius
- celsius → fahrenheit Fahrenheit (°F)
- celsius → rankine Rankine (°R)
Related conversions to kelvin
- fahrenheit → kelvin Fahrenheit (°F)
- rankine → kelvin Rankine (°R)