Converter
Celsius to Kelvin Converter
Type a value in celsius and get the kelvin answer instantly — with the formula and a reference table right below.
K = °C + 273.15
Celsius to Kelvin Converter guide
What does this converter do?
This page converts celsius (°C) to kelvin (K) instantly as you type. It is one focused pair from the full Temperature converter, which handles every supported temperature unit in both directions.
How is the conversion calculated?
K = °C + 273.15. Add 273.15 to the Celsius value. The factor is fixed, so the math is deterministic and repeatable.
When °C to K comes up
You are solving a chemistry or physics problem — gas laws, reaction kinetics, thermodynamics — where every temperature must be absolute, converting room and body temperatures for a lab report, entering a temperature into scientific software or a datasheet that specifies Kelvin, or checking the color temperature or cryogenic figures in an engineering spec. Anyone using a formula that multiplies or divides by temperature needs Kelvin, not Celsius.
Quick mental rule
Add 273: 20 °C + 273 = 293 K against the exact 293.15 K. Dropping the 0.15 leaves an error of only 0.05% at room temperature, which is fine for rough gas-law estimates but not for lab work. The degree size is identical, so temperature differences in °C and K are the same number.
Worked example
Worked example: 20 °C converts to 293.15 K. Change the input above to convert your own value.
Common values
The reference table lists frequently searched amounts such as 1, 10, and 100 °C. Amounts are shown rounded for readability; the live result keeps full precision.
Common questions
Frequently asked questions
What is 20 °C in Kelvin?
20 + 273.15 = 293.15 K, the value used for room temperature in many physics problems.
What is 0 °C in Kelvin?
0 °C is 273.15 K — the freezing point of water and the offset between the two scales.
What is 25 °C in Kelvin?
25 °C is 298.15 K, the standard temperature quoted for most thermodynamic tables.
What is absolute zero in Celsius?
Absolute zero, 0 K, is −273.15 °C. Nothing can be colder, so no Celsius value below −273.15 has a Kelvin equivalent.