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Kelvin to Celsius Converter

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

K

Celsius

36.85

°C

310 K = 36.85 °C

°C = K − 273.15

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

How to Convert Kelvin to Celsius

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

Conversion Formula

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

Kelvin to Celsius Conversion Chart

Kelvin (K)Celsius (°C)
0.1-273.05
0.25-272.9
0.5-272.65
1-272.15
2-271.15
3-270.15
5-268.15
10-263.15
20-253.15
25-248.15
50-223.15
100-173.15
250-23.15
1000726.85

Understanding the Units

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.

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.

Real-World Reference Points

Item Kelvin (K) Celsius (°C)
Absolute zero0-273.15
Water freezing point273.150
Surface of the Sun57785504.85

How to Convert Kelvin to Celsius

To convert Kelvin to Celsius, subtract 273.15. The Kelvin scale is an absolute thermodynamic scale starting at absolute zero (-273.15°C), making the conversion a simple offset with no multiplication required.

Conversion Formula

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

Common Conversions

KelvinCelsius
0-273.15
77-196.15
233-40.15
273.150
310.1537
373.15100
57785504.85

When to Use Kelvin

Kelvin is the SI base unit of temperature used in physics, chemistry, and engineering. Color temperature of light sources, gas law equations, and thermodynamic calculations all rely on the Kelvin scale.

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FAQ

How do I convert Kelvin to Celsius?

Subtract 273.15 from the Kelvin value. For example, 373.15 K − 273.15 = 100°C.

What is 0 Kelvin in Celsius?

0 Kelvin equals -273.15°C. This is absolute zero, the lowest theoretically possible temperature where all molecular motion stops.

Why does the Kelvin scale start at absolute zero?

Lord Kelvin designed the scale so that zero represents the complete absence of thermal energy. This makes Kelvin ideal for scientific calculations involving thermodynamics and gas laws.

Is a degree Kelvin the same size as a degree Celsius?

Yes, one kelvin increment is exactly the same magnitude as one degree Celsius. The scales differ only by their starting point: 0 K = -273.15°C.

How do you convert kelvin to celsius?

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

How do you convert celsius back to kelvin?

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

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

Kelvin and Celsius 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 Kelvin and Celsiu?

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. 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.