Home/Mathematics/Celsius to Kelvin

Formula & Calculator

Celsius to Kelvin

Converts a temperature reading from degrees Celsius into Kelvin, the absolute temperature scale used throughout science.

Written by the Vorzep Team

MathematicsUnit ConversionDaily Life

Celsius to Kelvin CalculatorTemperature Conversion

K = °C + 273.15
K = Kelvin  ·  °C = Celsius
⟹ Solve⟷K, °C
°C
K
Please fix the errors above.
Solve for:
Presets:
Kelvin—
—
°C: —K: —
✓ Copied!
Temperature Gauge (Kelvin)—
Very Cold (< 200 K) Cold (200–300 K) Warm (300–400 K) Hot (> 400 K)
K = °C + 273.15  ·  Absolute zero is 0 K (−273.15°C)

Interpretation

K = C + 273.15. Converts Celsius to Kelvin. Kelvin is the SI unit for temperature. Used in science and engineering.

K = C + 273.15
Celsius to Kelvin

Variables

SymbolQuantityUnit
KTemperature in Kelvin
CTemperature in Celsius°C

What it means

The Kelvin scale is the SI base unit of thermodynamic temperature. The conversion from Celsius to Kelvin is simply adding 273.15 (since 0°C = 273.15 K). This scale is used in physics, chemistry, and engineering for gas laws (ideal gas equation), for thermodynamic calculations, and for cryogenics. Unlike Celsius, Kelvin is an absolute scale where 0 K is absolute zero. Understanding this conversion is essential for scientific work, especially when using equations like PV = nRT.

Worked example

Celsius to Kelvin – Two Examples

Real‑World
Scenario: Water freezes at 0°C. Convert to K.
ParameterValue
C0
1K = 0 + 273.15 = 273.15 K
Result 273.15 K ✓ Freezing point
Scenario: Body temperature 37°C. Convert to K.
ParameterValue
C37
1K = 37 + 273.15 = 310.15 K
Result 310.15 K ✓ Body temp
Insight: K = °C + 273.15. No negative Kelvin – absolute zero is 0 K (−273.15°C).

Common mistakes

  • Conversion factor: 0°C = 273.15 K – add 273.15 to Celsius.
  • Direction: This converts °C to K – for K to °C, subtract 273.15.
  • Precision: Use 273.15 for exact (or 273 for approximate).
  • Kelvin: Absolute temperature – no negative values.
  • Applications: Used in thermodynamics and scientific research.

Applications

Celsius to Kelvin conversion, K = C + 273.15, is essential in scientific and engineering work where absolute temperature is required. The Kelvin scale is used in thermodynamics, physics, and many engineering calculations (e.g., ideal gas law). Engineers convert Celsius to Kelvin for accurate energy and entropy computations. In cryogenics and space science, Kelvin is the standard. By using this conversion, professionals can apply fundamental equations correctly and avoid errors due to offset scales. This conversion is a basic skill for any scientist or engineer working with temperature‑dependent phenomena.

  • Thermodynamic calculations (ideal gas law, Carnot efficiency)
  • Heat transfer and thermal analysis in engineering
  • Physics and chemistry – absolute temperature in equations
  • Cryogenic and low‑temperature research
  • Astrophysics and space science temperature measurements

Frequently Asked Questions

Q01What is the formula for converting Celsius to Kelvin?
A01

The conversion is K = °C + 273.15. This adds the offset to get absolute temperature.

Q02What is the common mistake when using this formula?
A02

Writing the result with a degree symbol, when the Kelvin scale conventionally omits it.

Q03What is the absolute zero in Celsius?
A03

–273.15°C.

Q04What is the freezing point of water in Kelvin?
A04

273.15 K.

Q05What is the boiling point of water in Kelvin?
A05

373.15 K.

Q06What is the inverse conversion from Kelvin to Celsius?
A06

°C = K – 273.15.

Q07Why is the Kelvin scale used in scientific work?
A07

It is an absolute scale, making it convenient for gas laws and thermodynamics.

Q08What are the applications of this conversion?
A08

Scientific experiments, chemistry, and physics.