-20 Celsius to kelvin
253.15 K
-20 °C = 253.15 K.
kelvin
253.15K
-20 °C = 253.15 K
In short
How many kelvin is -20 Celsius?
-20 °C = 253.15 K. 1 Celsius = 1.000000 kelvin, then + 273.15, so the working is -20 × 1.000000 + 273.1500 = 253.15.
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 -20 × 1.000000 + 273.1500 = 253.15
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 | 253 | −0.15000 |
| 1 decimal | 253.1 | −0.05000 |
| 2 decimals | 253.15 | +0.00000 |
Round trip: take 253.15 K back the other way and you land on -20.0000 °C — a drift of 0.0000 °C. That gap is the rounding, not the conversion.
What -20 °C looks like
-18 °C
A home freezer at the FDA advised setting of 0 degrees Fahrenheit sits just below here, at 255.37 kelvin.
Frequently asked questions
What is -20 Celsius in kelvin?
-20 Celsius is 253.15 kelvin. 1 Celsius = 1.000000 kelvin, then + 273.15, so the working is -20 × 1.000000 + 273.1500 = 253.15.
How accurate is 253.15 K?
Rounding to 253.15 K and converting straight back gives -20.0000 °C, a drift of 0.0000 °C from the -20 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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