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Celsius to Kelvin Converter

Convert Celsius to Kelvin and Kelvin to Celsius instantly. Bidirectional temperature converter with formula and common values.

°C

Kelvin

310.15

K

37 °C = 310.15 K

K = °C + 273.15

Celsius to Kelvin: To convert celsius to kelvin, apply K = °C + 273.15. Unlike linear unit conversions, celsius and kelvin use different zero points, so a fixed multiplier is not sufficient.

How to Convert Celsius to Kelvin

Converting between celsius and kelvin requires both a scale factor and an offset because the two scales use different zero points. The formula below handles both adjustments.

Conversion Formula

  • Celsius to Kelvin: K = °C + 273.15
  • Kelvin to Celsius: °C = K − 273.15

Celsius to Kelvin Conversion Chart

Celsius (°C)Kelvin (K)
0.1273.25
0.25273.4
0.5273.65
1274.15
2275.15
3276.15
5278.15
10283.15
20293.15
25298.15
50323.15
100373.15
250523.15
10001273.15

Understanding the Units

What is a Celsiu?

The degree Celsius is a derived SI unit of temperature where 0 °C corresponds to the freezing point of water and 100 °C to the boiling point at standard atmospheric pressure.

Named after Anders Celsius (1701–1744), Swedish astronomer who proposed the original scale in 1742.

Common contexts: weather, cooking, science.

What is a Kelvin?

The kelvin is the SI base unit of thermodynamic temperature, defined since 2019 by fixing the Boltzmann constant at exactly 1.380649 × 10⁻²³ J/K.

Named after William Thomson, 1st Baron Kelvin (1824–1907), who proposed an absolute thermodynamic scale in 1848.

Common contexts: physics, astronomy, cryogenics.

Real-World Reference Points

Item Celsius (°C) Kelvin (K)
Water freezing point0273.15
Comfortable room21294.15
Human body temperature37310.15
Water boiling point100373.15

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FAQ

How do I convert Celsius to Kelvin?

Add 273.15 to the Celsius value. For example, 23.7°C + 273.15 = 296.85 K.

What is 0 Kelvin in Celsius?

0 Kelvin (absolute zero) equals -273.15°C. It is the lowest possible temperature.

Why does the Kelvin scale not use a degree symbol?

Kelvin is an absolute scale where 0 represents absolute zero. It uses "K" without the degree symbol (°) as per SI convention.

What is room temperature in Kelvin?

Typical room temperature of about 22°C equals approximately 295.15 K.

How do you convert celsius to kelvin?

Apply the formula K = °C + 273.15. For example, celsius of 0 corresponds to 273.15 kelvin.

How do you convert kelvin back to celsius?

Use the inverse formula: °C = K − 273.15.

Why isn't celsius-to-kelvin a simple multiplication?

Celsius and Kelvin use different zero points, so the relationship includes both a scale factor and an offset. The scale factor alone gives the rate of change but not the absolute value.

What is the difference between Celsiu and Kelvin?

The degree Celsius is a derived SI unit of temperature where 0 °C corresponds to the freezing point of water and 100 °C to the boiling point at standard atmospheric pressure. The kelvin is the SI base unit of thermodynamic temperature, defined since 2019 by fixing the Boltzmann constant at exactly 1.380649 × 10⁻²³ J/K.