Kelvin Converter — K to °C, °F and Rankine
Enter a temperature in Kelvin to get the exact Celsius, Fahrenheit, and Rankine equivalents in one step, plus a linear chart of the K → °C relationship.
K
°C = K − 273.15
- 1
Kelvin input
300 K - 2
Subtract offset (−273.15)
300 − 273.15 = 26.8500The Celsius scale shifts the Kelvin scale by exactly 273.15 — the Kelvin equivalent of 0 °C.
How does this calculator work?
Subtract 273.15 from Kelvin to get Celsius; multiply that by 9/5 and add 32 for Fahrenheit; or multiply Kelvin by 9/5 for Rankine. All conversions are linear. Key anchors: 0 K = −273.15 °C = −459.67 °F; 273.15 K = 0 °C = 32 °F; 373.15 K = 100 °C = 212 °F.
Formula
How this is calculated
Kelvin is the SI base unit of thermodynamic temperature, anchored at absolute zero — the lowest possible temperature where particles have minimum thermal energy. Because of this anchor, Kelvin values are always non-negative. The Celsius scale uses the same degree size as Kelvin but shifts the zero point to the freezing point of water, so the conversion is simply a subtraction: °C = K − 273.15.
Fahrenheit uses a different degree size (each Fahrenheit degree is 5/9 of a Celsius degree) and a different zero point, making the conversion a two-step operation: shift from Kelvin to Celsius first, then rescale and offset to Fahrenheit. The Rankine scale keeps Fahrenheit degree sizes but anchors at absolute zero like Kelvin, so °R = K × 9/5 with no additive offset.
All four conversions are linear, meaning a fixed difference in Kelvin always corresponds to a fixed difference in the target scale. The chart shows the K → °C line for a range centred on your input value.
Frequently asked questions
0 K = −273.15 °C = −459.67 °F. This is absolute zero, the theoretical lower limit of temperature. It has never been reached experimentally, though laboratories have come within nanokelvins of it.
Kelvin is an SI base unit, not a "degree" scale. It is written as "300 K", not "300 °K". The degree symbol (°) is reserved for Celsius and Fahrenheit, which are offset-based scales.
Kelvin is preferred in physics, chemistry, astronomy, and engineering because equations for thermodynamics, radiation, and gas laws require an absolute temperature scale — one where zero means truly zero thermal energy. Celsius and Fahrenheit are relative scales unsuitable for direct use in most physical equations.
Also known as
TG we-Calculate Editorial Team. (2026). Kelvin Converter — K to °C, °F and Rankine [Online calculator]. TG we-Calculate. https://we-calculate.com/calculator/kelvin-converter
TG we-Calculate Editorial Team. "Kelvin Converter — K to °C, °F and Rankine." TG we-Calculate. 2026. https://we-calculate.com/calculator/kelvin-converter.
TG we-Calculate Editorial Team, "Kelvin Converter — K to °C, °F and Rankine," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/calculator/kelvin-converter
@misc{wecalculate_kelvin_converter, title = {Kelvin Converter — K to °C, °F and Rankine}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/calculator/kelvin-converter}}, year = {2026}, note = {TG we-Calculate} }
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