Temperature conversion
Kelvin to Celsius converter
Convert K to °C instantly, choose the displayed precision, and verify the result with the formula and reference table below.
Celsius (°C)
Rounded for display only; calculations retain full precision.
Rounding and precision rules
- Convr calculates first and rounds the displayed result only once, at the final step.
- The default is a maximum of 6 decimal places; trailing zeros are removed.
- Very small values that would appear as zero, and values of 10¹² or more, use scientific notation.
- Display precision is not measurement uncertainty. For scientific, engineering, or regulated work, retain only the digits justified by the source measurement.
Practical context
Understanding this conversion
Kelvin values are common in thermodynamics, material specifications, astronomy, lighting color temperature, and scientific literature. Celsius expresses the corresponding temperature on a scale familiar for weather and everyday use.
The scales use equal increments, so conversion requires subtraction rather than multiplication. A temperature interval of 10 K is the same size as an interval of 10 °C, even though the scale readings differ.
Reviewed August 16, 2026.
Calculation
Kelvin to Celsius formula
°C = K − 273.15
Calculations retain full precision and the result is rounded only for display.
Worked example
For 25 K, the result is -248.15 °C. Substitute 25 K into the formula to obtain -248.15 °C.
Temperature scales use both scale and offset, so this conversion is not a simple multiplication.
Kelvin to Celsius reference table
Common values rounded to a maximum of 6 decimal places.
| Kelvin (K) | Celsius (°C) |
|---|---|
| 1 K | -272.15 °C |
| 5 K | -268.15 °C |
| 10 K | -263.15 °C |
| 50 K | -223.15 °C |
| 100 K | -173.15 °C |
Understanding the units
About Kelvin and Celsius
Kelvin (K)
The kelvin is the SI unit of thermodynamic temperature and begins at absolute zero.
Celsius (°C)
The Celsius scale sets water’s freezing point at 0 °C and boiling point at 100 °C at standard atmospheric pressure.
When this conversion is useful
Kelvin to Celsius conversion is useful for weather reports, cooking instructions, laboratory readings, engineering specifications, and scientific data. It lets you compare the same temperature reading across documents, tools, or standards that use different units.
Learn with Convr
Conversion guides
Celsius, Fahrenheit, Kelvin, and Rankine Explained
Learn how the four major temperature scales differ, why offsets matter, and which formulas convert between them correctly.
Read guide →FoundationsSignificant Figures and Rounding in Unit Conversions
Learn when to round conversion results, how significant figures preserve measurement meaning, and why more decimals do not guarantee more accuracy.
Read guide →Answers at a glance
Frequently asked questions
What is 300 K in Celsius?
Subtracting 273.15 from 300 gives 26.85 °C.
Can a kelvin temperature be negative?
Ordinary thermodynamic temperature starts at 0 K, absolute zero. Negative kelvin values arise only in specialized descriptions of certain nonstandard systems.
How does Convr round Kelvin to Celsius results?
Convr keeps full numeric precision during the calculation and rounds only the displayed result. The default is a maximum of 6 decimal places, with selectable precision on this page.
Can I convert negative or decimal kelvin values?
Yes. The converter accepts positive, negative, decimal, and scientific-notation values. Negative values are physically meaningful for some scales, such as temperature, but not for every measured quantity.
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