Convert Kelvin to Celsius
Instantly convert Kelvin (K) to Celsius (°C) with our free online calculator.
Formula: K to °C — K − 273.15
Reference Table
| Kelvin (K) | Celsius (°C) |
|---|---|
| 1 | -272.15 |
| 5 | -268.15 |
| 10 | -263.15 |
| 25 | -248.15 |
| 50 | -223.15 |
| 100 | -173.15 |
How to Convert Kelvin to Celsius
Formula
To convert Kelvin (K) to Celsius (°C): K − 273.15
Step-by-Step
- Start with your value in Kelvin (K).
- K − 273.15 to perform the conversion.
- The result is your value expressed in Celsius (°C).
Conversion Factor
1 K = -272.15 °C
Reverse Factor
1 °C = 274.15 K
Worked Example
Convert 25 Kelvin to Celsius: 25 K = -248.15 °C
About Kelvin (K)
The SI base unit of temperature, measured on an absolute scale where 0 K is absolute zero — the theoretical point at which all thermal motion stops. Named after Lord Kelvin and defined since 2019 by fixing the numerical value of the Boltzmann constant. Kelvin shares its degree interval with Celsius (1 K = 1°C), so conversion is a straight offset. Scientific publications, thermodynamic formulas, cryogenic physics, and plasma physics exclusively use kelvin because absolute-zero-referenced math stays dimensionally clean.
About Celsius (°C)
A temperature scale on which water freezes at 0° and boils at 100° under standard atmospheric pressure, devised by Swedish astronomer Anders Celsius in 1742. Celsius is the global standard for weather forecasts, cooking, human body temperature (normal ~37°C), and most scientific measurement outside the US. Because its degree interval is identical to the kelvin, Celsius is the everyday face of SI temperature: scientists and laypeople alike use it without any conversion penalty.
Quick Facts
- 1 Kelvin equals -272.15 Celsius
- 1 Celsius equals 274.15 Kelvin
- Kelvin is a unit of temperature
- Celsius is a unit of temperature
- This conversion is commonly used in weather forecasting, cooking, scientific experiments, and HVAC
- The Kelvin belongs to the metric system
Common Kelvin to Celsius Conversions
| Kelvin (K) | Celsius (°C) |
|---|---|
| -40 | -313.15 |
| -20 | -293.15 |
| -10 | -283.15 |
| 0 | -273.15 |
| 5 | -268.15 |
| 10 | -263.15 |
| 15 | -258.15 |
| 20 | -253.15 |
| 25 | -248.15 |
| 30 | -243.15 |
| 35 | -238.15 |
| 37 | -236.15 |
| 40 | -233.15 |
| 50 | -223.15 |
| 60 | -213.15 |
| 70 | -203.15 |
| 80 | -193.15 |
| 90 | -183.15 |
| 100 | -173.15 |
| 150 | -123.15 |
| 200 | -73.15 |
Understanding Kelvin
The Kelvin (symbol: K) is a unit of temperature. The SI base unit of temperature, measured on an absolute scale where 0 K is absolute zero — the theoretical point at which all thermal motion stops. Named after Lord Kelvin and defined since 2019 by fixing the numerical value of the Boltzmann constant. Kelvin shares its degree interval with Celsius (1 K = 1°C), so conversion is a straight offset. Scientific publications, thermodynamic formulas, cryogenic physics, and plasma physics exclusively use kelvin because absolute-zero-referenced math stays dimensionally clean.
It belongs to the metric measurement system.
Kelvin are commonly used in weather forecasting, cooking, scientific experiments, and HVAC.
Understanding Celsius
The Celsius (symbol: °C) is a unit of temperature. A temperature scale on which water freezes at 0° and boils at 100° under standard atmospheric pressure, devised by Swedish astronomer Anders Celsius in 1742. Celsius is the global standard for weather forecasts, cooking, human body temperature (normal ~37°C), and most scientific measurement outside the US. Because its degree interval is identical to the kelvin, Celsius is the everyday face of SI temperature: scientists and laypeople alike use it without any conversion penalty.
It belongs to the metric measurement system.
Celsius are commonly used in weather forecasting, cooking, scientific experiments, and HVAC.
Why Convert Kelvin to Celsius?
Converting between Kelvin and Celsius is essential for a variety of everyday and professional tasks. International recipes list oven temperatures in different scales, weather reports from other countries use unfamiliar units, and scientists must reconcile data recorded under different conventions. Medical professionals also compare body temperature readings that may be reported in different units depending on the country or device.
Frequently Asked Questions
How do I convert Kelvin to Celsius?
The SI base unit of temperature, measured on an absolute scale where 0 K is absolute zero — the theoretical point at which all thermal motion stops. To convert Kelvin to Celsius, K − 273.15. For example, 25 K equals -248.15 °C.
How many Celsius are in 1 Kelvin?
There are -272.15 Celsius in 1 Kelvin.
How many Kelvin are in 1 Celsius?
There are 274.15 Kelvin in 1 Celsius.
What is the formula for Kelvin to Celsius conversion?
The formula is: K − 273.15. This means 1 K = -272.15 °C.
Is a Kelvin bigger than a Celsius?
Yes. One Kelvin is larger than one Celsius because 1 K equals -272.15 °C, which is less than 1.
When do you need to convert between Kelvin and Celsius?
A temperature scale on which water freezes at 0° and boils at 100° under standard atmospheric pressure, devised by Swedish astronomer Anders Celsius in 1742. Kelvin and Celsius are both temperature units, so conversion comes up whenever one source of information uses one unit and another uses the other — a classic cross-reference challenge in engineering, trade, travel, and everyday life.