Convert Celsius to Kelvin
Instantly convert Celsius (°C) to Kelvin (K) with our free online calculator.
Formula: °C to K — °C + 273.15
Reference Table
| Celsius (°C) | Kelvin (K) |
|---|---|
| 1 | 274.15 |
| 5 | 278.15 |
| 10 | 283.15 |
| 25 | 298.15 |
| 50 | 323.15 |
| 100 | 373.15 |
How to Convert Celsius to Kelvin
Formula
To convert Celsius (°C) to Kelvin (K): °C + 273.15
Step-by-Step
- Start with your value in Celsius (°C).
- °C + 273.15 to perform the conversion.
- The result is your value expressed in Kelvin (K).
Conversion Factor
1 °C = 274.15 K
Reverse Factor
1 K = -272.15 °C
Worked Example
Convert 25 Celsius to Kelvin: 25 °C = 298.15 K
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.
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.
Quick Facts
- 1 Celsius equals 274.15 Kelvin
- 1 Kelvin equals -272.15 Celsius
- Celsius is a unit of temperature
- Kelvin is a unit of temperature
- This conversion is commonly used in weather forecasting, cooking, scientific experiments, and HVAC
- The Celsius belongs to the metric system
Common Celsius to Kelvin Conversions
| Celsius (°C) | Kelvin (K) |
|---|---|
| -40 | 233.15 |
| -20 | 253.15 |
| -10 | 263.15 |
| 0 | 273.15 |
| 5 | 278.15 |
| 10 | 283.15 |
| 15 | 288.15 |
| 20 | 293.15 |
| 25 | 298.15 |
| 30 | 303.15 |
| 35 | 308.15 |
| 37 | 310.15 |
| 40 | 313.15 |
| 50 | 323.15 |
| 60 | 333.15 |
| 70 | 343.15 |
| 80 | 353.15 |
| 90 | 363.15 |
| 100 | 373.15 |
| 150 | 423.15 |
| 200 | 473.15 |
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.
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.
Why Convert Celsius to Kelvin?
Converting between Celsius and Kelvin 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 Celsius to Kelvin?
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. To convert Celsius to Kelvin, °C + 273.15. For example, 25 °C equals 298.15 K.
How many Kelvin are in 1 Celsius?
There are 274.15 Kelvin in 1 Celsius.
How many Celsius are in 1 Kelvin?
There are -272.15 Celsius in 1 Kelvin.
What is the formula for Celsius to Kelvin conversion?
The formula is: °C + 273.15. This means 1 °C = 274.15 K.
Is a Celsius bigger than a Kelvin?
No. One Celsius is smaller than one Kelvin because 1 °C equals 274.15 K, which is greater than 1.
When do you need to convert between Celsius and Kelvin?
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. Celsius and Kelvin 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.