ToolKit Pro

Kelvin to Celsius converter (K → °C)

1 K = -272.15 °C. Type any value below for an instant answer, or find your number in the conversion chart.

Exact NIST / BIPM factorReviewed Runs in your browser · no signup
Instant answer
Swap
-118.15 °C
155 Kelvin (K) = -118.15 Celsius
Most-searched values
Formula: °C = K − 273.15
Category: Temperature

K to °C formula

°C = K − 273.15

Worked example: 155 K = -118.15 °C. The defining value behind this factor is documented on our temperature standards page.

Kelvin to Celsius chart

Includes standard reference values plus the specific numbers people search for most.

K to °C conversion chart
Kelvin (K)Celsius (°C)
1 K-272.15 °C
2 K-271.15 °C
3 K-270.15 °C
4 K-269.15 °C
5 K-268.15 °C
6 K-267.15 °C
7 K-266.15 °C
8 K-265.15 °C
9 K-264.15 °C
10 K-263.15 °C
12 K-261.15 °C
15 K-258.15 °C
20 K-253.15 °C
25 K-248.15 °C
30 K-243.15 °C
33 K-240.15 °C
37 K-236.15 °C
40 K-233.15 °C
50 K-223.15 °C
67 K-206.15 °C
75 K-198.15 °C
77 K-196.15 °C
100 K-173.15 °C
135 K-138.15 °C
150 K-123.15 °C
155 K-118.15 °C
175 K-98.15 °C
176 K-97.15 °C
200 K-73.15 °C
245 K-28.15 °C
250 K-23.15 °C
253 K-20.15 °C
285 K11.85 °C
290 K16.85 °C
305 K31.85 °C
310 K36.85 °C
315 K41.85 °C
325 K51.85 °C
390 K116.85 °C
455 K181.85 °C
500 K226.85 °C
800 K526.85 °C
1000 K726.85 °C
1200 K926.85 °C
1600 K1,326.85 °C
2500 K2,226.85 °C
3100 K2,826.85 °C
4550 K4,276.85 °C

Most-searched K to °C answers

155 K to °C

-118.15 °C

285 K to °C

11.85 °C

390 K to °C

116.85 °C

290 K to °C

16.85 °C

310 K to °C

36.85 °C

315 K to °C

41.85 °C

305 K to °C

31.85 °C

67 K to °C

-206.15 °C

253 K to °C

-20.15 °C

37 K to °C

-236.15 °C

77 K to °C

-196.15 °C

1200 K to °C

926.85 °C

When to convert K to °C

  • ▸Weather forecasts — Celsius is the global standard; the US still uses Fahrenheit. 155° in one scale feels very different in the other.
  • ▸Cooking — oven recipes swap between °C and °F; a 155° setting in one manual matches a different number in another.
  • ▸Fever & medical thresholds — 100.4 °F = 38.0 °C is the classic fever cutoff; conversion errors matter clinically.
  • ▸Science & chemistry — reactions specify temperature in °C or K; the conversion is fundamental.

Common mistakes

  • ✕Applying the wrong direction of the °F/°C formula (many people multiply by 5/9 instead of 9/5).
  • ✕Forgetting the +32 offset for Fahrenheit or the +273.15 offset for Kelvin.
  • ✕Using degrees Kelvin — Kelvin has no degree symbol (write "300 K", not "300 °K").
  • ✕A temperature and a temperature difference convert differently. To convert a reading, use °F = °C × 9/5 + 32. To convert a difference or an interval, drop the offset: a rise of 10 °C is a rise of 18 °F, not 50 °F. This is the single most common temperature conversion error.

Regional usage & source

Celsius is the global standard. Fahrenheit is used in the US. Kelvin is standard in science and engineering.

Reference: °F = °C × 9/5 + 32. Kelvin = °C + 273.15. The Kelvin was redefined in 2019 in terms of the Boltzmann constant (BIPM).

How these numbers are produced and rounded: methodology.

Other temperature converters

⇄ Celsius to Kelvin°C to °F°F to °C°C to K°F to KK to °F

Kelvin to Celsius — FAQs

What is 155 K in °C?

155 K = -118.15 °C.

What is 285 K in °C?

285 K = 11.85 °C.

What is 390 K in °C?

390 K = 116.85 °C.

What is 290 K in °C?

290 K = 16.85 °C.

Is the K to °C result exact or rounded?

Temperature readings use an offset as well as a scale factor: °C = K − 273.15. This is not multiplication by a fixed per-degree value. Results are calculated before display rounding; a temperature difference uses only the scale factor, not the offset.

How do I convert °C back to K?

The reverse formula is K = °C + 273.15. For example, -272.15 °C converts back to approximately 1 K; a rounded intermediate result can introduce a small rounding difference.

You might also need

Universal Unit Converter
°C, °F and Kelvin in one place