20 kelvin to Celsius
-253.15 °C
20 K = -253.15 °C.
Celsius
-253.15°C
20 K = -253.15 °C
In short
How many Celsius is 20 kelvin?
20 K = -253.15 °C. 1 kelvin = 1.000000 Celsius, 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 kelvin = 1.000000 Celsius, 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 (°C) | Off by |
|---|---|---|
| Whole number | -253 | +0.15000 |
| 1 decimal | -253.1 | +0.05000 |
| 2 decimals | -253.15 | −0.00000 |
Round trip: take -253.15 °C back the other way and you land on 20.0000 K — a drift of 0.0000 K. That gap is the rounding, not the conversion.
What 20 K looks like
20 K
Hydrogen boils at about 20.3 kelvin at standard pressure, which is why liquid hydrogen rocket fuel needs vacuum-jacketed tanks.
Frequently asked questions
What is 20 kelvin in Celsius?
20 kelvin is -253.15 Celsius. 1 kelvin = 1.000000 Celsius, then − 273.15, so the working is 20 × 1.000000 − 273.1500 = -253.15.
How accurate is -253.15 °C?
Rounding to -253.15 °C and converting straight back gives 20.0000 K, a drift of 0.0000 K 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
Kelvin to Celsius Converter
Convert kelvin to Celsius — lab readings, physics homework, and colour temperature.
Open the kelvin to celsius converter →