Kelvin to Celsius Converter

Celsius is kelvin minus 273.15 — same size of degree, different zero. This converts both ways, shows Fahrenheit too, and lists the landmark temperatures.

Kelvin	Celsius
0 K	-273.15 °C
77 K	-196.15 °C
100 K	-173.15 °C
195.15 K	-78 °C
233.15 K	-40 °C
273.15 K	0 °C
283.15 K	10 °C
293.15 K	20 °C
298.15 K	25 °C
300 K	26.85 °C
310.15 K	37 °C
373.15 K	100 °C
400 K	126.85 °C
500 K	226.85 °C
1,000 K	726.85 °C
5,772 K	5,498.85 °C

Celsius	Kelvin
-273.15 °C	0 K
-196 °C	77.15 K
-40 °C	233.15 K
-20 °C	253.15 K
-10 °C	263.15 K
0 °C	273.15 K
10 °C	283.15 K
20 °C	293.15 K
25 °C	298.15 K
30 °C	303.15 K
37 °C	310.15 K
100 °C	373.15 K
200 °C	473.15 K
500 °C	773.15 K
1,000 °C	1,273.15 K

Same degree, different zero

The kelvin and the Celsius degree are the same size; the scales differ only in where zero sits. Celsius puts 0 at the freezing point of water, kelvin puts 0 at absolute zero, the point at which molecular motion is minimal. That gap is exactly 273.15, so converting is a subtraction or an addition and nothing else. Kelvin has no degree sign — it is written 300 K, not 300 °K.

°C = K − 273.15 | K = °C + 273.15 | °F = °C × 9/5 + 32

Where kelvin shows up

Kelvin is the scientific temperature scale: gas laws, blackbody radiation and thermodynamics all need a true zero, because doubling the temperature only means something when zero really is zero. Colour temperature of light bulbs (2,700 K warm white, 6,500 K daylight) and the surface of the Sun (about 5,772 K) are the two places most people meet it outside a lab. Room temperature is roughly 293–298 K.

Landmarks

Absolute zero is 0 K = −273.15 °C. Liquid nitrogen boils at 77 K (−196 °C). Water freezes at 273.15 K and boils at 373.15 K at sea level. Body temperature is 310.15 K. The Rankine row is the Fahrenheit-sized absolute scale used in some US engineering work: °R = K × 1.8.

Frequently asked questions

What is 300 K in Celsius?

300 K is 26.85 °C (80.33 °F) — a warm room. Subtract 273.15 from any kelvin figure to get Celsius.

What is 0 kelvin in Celsius?

0 K is absolute zero: −273.15 °C or −459.67 °F. No temperature can be lower.

How do I convert Celsius to kelvin?

Add 273.15. Water's boiling point of 100 °C is 373.15 K; body temperature of 37 °C is 310.15 K.

Why is there no degree symbol on kelvin?

Since 1967 the kelvin is a unit in its own right, not a degree on a scale, so it is written 300 K. Celsius and Fahrenheit keep the degree sign.

What is room temperature in kelvin?

About 293 to 298 K (20 to 25 °C). Many physics problems use 298.15 K, which is exactly 25 °C.

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