25 Celsius to kelvin
298.15 K
25 °C = 298.15 K.
kelvin
298.15K
25 °C = 298.15 K
In short
How many kelvin is 25 Celsius?
25 °C = 298.15 K. 1 Celsius = 1.000000 kelvin, then + 273.15, so the working is 25 × 1.000000 + 273.1500 = 298.15.
The working
The factor below is an exact definition rather than a measurement, so nothing is approximated in the arithmetic. The only rounding on this page happens where a number is displayed.
1 Celsius = 1.000000 kelvin, then + 273.15 25 × 1.000000 + 273.1500 = 298.15
How much precision do you need?
Each row is the same answer cut at a different number of decimals, with what that choice costs you. Pick the shortest row whose error is smaller than whatever you are measuring with.
| Rounded to | Answer (K) | Off by |
|---|---|---|
| Whole number | 298 | −0.15000 |
| 1 decimal | 298.1 | −0.05000 |
| 2 decimals | 298.15 | exact |
Round trip: take 298.15 K back the other way and you land on 25.0000 °C — a drift of 0.0000 °C. That gap is the rounding, not the conversion.
What 25 °C looks like
25 °C
Standard chemistry conditions are quoted at 25 degrees Celsius, which is 298.15 kelvin, the number that heads most thermodynamic tables.
Frequently asked questions
What is 25 Celsius in kelvin?
25 Celsius is 298.15 kelvin. 1 Celsius = 1.000000 kelvin, then + 273.15, so the working is 25 × 1.000000 + 273.1500 = 298.15.
How accurate is 298.15 K?
Rounding to 298.15 K and converting straight back gives 25.0000 °C, a drift of 0.0000 °C from the 25 you started with. The factor itself is exact; every bit of that difference comes from the rounding, not the conversion.
Nearby values
Any value at all
Celsius to Kelvin Converter
Convert Celsius to kelvin — gas-law problems, absolute temperature, and lab work.
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