Kelvin to Celsius Converter
Kelvin (K) → Celsius (°C)
Also: 77 °F Fahrenheit · 536.67 °R Rankine
Show Your Work
- 1. C = 298.15 − 273.15
- 2. C = 25°C
About this conversion
Reading a Kelvin output back into the Celsius scale used by lab instruments and everyday reporting is a one-step subtraction: C = K − 273.15. This page focuses on that single inverse, with a reference table sized for cryogenic, ambient, and high-temperature lab/industrial values.
Kelvin to Celsius Reference Table
| Kelvin (K) | Celsius (°C) |
|---|---|
| 0 | -273.15 |
| 50 | -223.15 |
| 77 | -196.15 |
| 100 | -173.15 |
| 150 | -123.15 |
| 200 | -73.15 |
| 250 | -23.15 |
| 273.15 | 0 |
| 280 | 6.85 |
| 290 | 16.85 |
| 298.15 | 25 |
| 300 | 26.85 |
| 310 | 36.85 |
| 350 | 76.85 |
| 373.15 | 100 |
| 400 | 126.85 |
| 500 | 226.85 |
| 600 | 326.85 |
| 800 | 526.85 |
| 1000 | 726.85 |
| 1500 | 1226.85 |
| 2000 | 1726.85 |
When to use Kelvin → Celsius
- Reporting a thermodynamic calculation result in everyday Celsius units
- Converting cryogenic temperatures (liquid nitrogen at 77 K, liquid helium at 4.2 K) into more familiar units
- Reading high-temperature engineering specs back into Celsius for a colleague
- Translating a star-temperature estimate (typically reported in K) into Celsius for popular-science contexts
Worked Example
A spectroscopy reading is 298.15 K. What is that in Celsius?
- Start with the Kelvin value: K = 298.15.
- Subtract 273.15: 298.15 − 273.15 = 25.
- So 298.15 K = 25°C.
298.15 K (25°C) is the IUPAC standard ambient temperature (SATP), so it shows up frequently in thermodynamic tables.
Frequently Asked Questions
What is the formula to convert Kelvin to Celsius?
C = K − 273.15. Subtract 273.15 from the Kelvin value.
What is 273.15 K in Celsius?
273.15 K = 0°C. This is the freezing point of water at standard atmospheric pressure.
What is 0 K in Celsius?
0 K = -273.15°C. Absolute zero — the theoretical minimum temperature where particles have no thermal kinetic energy.
Are negative Celsius values from a Kelvin input meaningful?
Only when the Kelvin input is positive but below 273.15. Cryogenic samples (e.g., 77 K = -196.15°C, the boiling point of liquid nitrogen) commonly produce strongly negative Celsius values.
More Temperature Conversions
- Celsius to Kelvin — the reverse direction
- Kelvin to Fahrenheit — same starting scale, different target
- Kelvin to Rankine — same starting scale, different target
- Fahrenheit to Celsius — different starting scale, same target
- Rankine to Celsius — different starting scale, same target
- All-scale Temperature Converter — see Celsius, Fahrenheit, Kelvin, and Rankine at once
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