Kelvin to Celsius Real-World Size Comparison Table
These are the temperatures students and scientists meet most often, from absolute zero to the Sun.
| Kelvin (K) | Celsius (°C) | Real-World Size Benchmark |
|---|---|---|
| 0 K | -273.15 °C | Absolute zero, the lowest possible temperature |
| 4.22 K | -268.93 °C | Liquid helium boils at this temperature |
| 77.36 K | -195.79 °C | Liquid nitrogen boils at this temperature |
| 194.65 K | -78.5 °C | Dry ice turns directly to gas |
| 233.15 K | -40 °C | The point where Celsius and Fahrenheit match |
| 273.15 K | 0 °C | Water freezes at standard pressure |
| 288.15 K | 15 °C | The standard sea-level atmosphere temperature |
| 298.15 K | 25 °C | Standard ambient temperature used in chemistry |
| 310.15 K | 37 °C | Average human body temperature |
| 373.15 K | 100 °C | Water boils at sea level |
| 5772 K | 5498.85 °C | The effective temperature of the Sun's surface |
Kelvin to Celsius Conversion Formula — How to Convert K to °C
°C = K − 273.15
A kelvin and a Celsius degree are the same size, so a temperature difference stays unchanged: a 10 K rise is a 10°C rise.
Step-by-Step K to °C Conversion Examples:
- •A lab at 293.15 K:293.15 − 273.15 =20°C
- •300 K, a common textbook figure:300 − 273.15 =26.85°C
- •Dry ice sublimation at 194.65 K:194.65 − 273.15 =−78.5°C
- •Water boiling at 373.15 K:373.15 − 273.15 =100°C
Why the Kelvin to Celsius Conversion Works & Common K to °C Converter Mistakes to Avoid
The kelvin scale starts at absolute zero, the lowest temperature that can exist, which equals −273.15°C. Both scales use degrees of the same size, so you only slide the zero point. Since 2019 the kelvin has been defined from a fixed value of the Boltzmann constant, but the 273.15 offset to Celsius is unchanged.
The Common K to °C Converter Mistake: Using 273 instead of 273.15 when the answer needs precision. It makes 300 K come out at 27°C instead of 26.85°C, which can cost marks. Another mix-up is writing the result in kelvins with a degree sign, such as 300°K. Also watch for impossible inputs: a kelvin value below zero cannot occur, so a negative number means a typing error or a value that is already in Celsius.
Where Kelvin-to-Celsius matters
Kelvin is the standard unit in physics, chemistry, astronomy and engineering, while ordinary thermometers and weather reports use Celsius. You need the conversion when a scientific result has to be understood or reported in everyday terms.
- • Use K For: Physics and chemistry problem sets, Scientific papers and datasheets, Astronomy and space science data, Gas-law and thermodynamics results
- • Use °C For: Weather and household temperatures, Reports for general readers, Lab equipment in Celsius, Everyday interpretation of a scientific value
Rule of Thumb: Subtract 273.15, or about 273 for a rough figure. 300 K is roughly 27°C, a warm room.
K to °C Converter in Spreadsheets — Spreadsheet Shortcut (Excel & Google Sheets)
With kelvins in cell A1, =A1-273.15 returns Celsius. For the reverse, use =A1+273.15. The built-in =CONVERT(A1,"K","C") does the same and shows the unit pair in the formula.
Kelvin to Celsius Conversion — Frequently Asked Questions
How do I convert Kelvin to Celsius?
Subtract 273.15 from the kelvin value. For example, 300 K − 273.15 = 26.85°C.
What is 0 K in Celsius?
0 K is −273.15°C, absolute zero.
What is 273 K in Celsius?
273 K is −0.15°C. Many people round 273.15 K to 273 K, but the exact freezing point of water is 273.15 K.
What is 300 K in Celsius?
300 K is 26.85°C, a warm room temperature.
What is 373 K in Celsius?
373 K is 99.85°C. Water boils at 373.15 K, which is exactly 100°C.
Is the degree sign used with Kelvin?
No. The unit is written K, not °K. Since 1967 the scale has been named kelvin with a capital K and no degree sign.
Can a kelvin temperature be negative?
No. Absolute zero is 0 K, the lowest possible temperature, so a negative value signals a mistake.
Are a Celsius degree and a kelvin the same size?
Yes. A change of 1 K equals a change of 1°C. Only the starting point differs.
K to °C Quick-Reference Conversion Table
The temperature conversions that sit around Kelvin to Celsius.
| To convert | Operation | Example |
|---|---|---|
| K → °C | − 273.15 | 300 K → 26.85°C |
| °C → K | + 273.15 | 25°C → 298.15 K |
| K → °F | (− 273.15) × 9/5 + 32 | 373.15 K → 212°F |
| °F → K | (− 32) × 5/9 + 273.15 | 68°F → 293.15 K |