Quick Answer: Kelvin to Celsius
0 K equals -273.15 °C, and 1 K equals -272.15 °C (°C = K − 273.15).
Conversely, 1 °C = 274.15 K.
Formula: °C = K − 273.15
Worked examples
- 0 K = -273.15 °C
- 100 K = -173.15 °C
- 200 K = -73.15 °C
Method and limitations
To convert Kelvin to Celsius, subtract 273.15 from the Kelvin value. Calculations use full-precision constants; answers in this box are rounded for readability (≈ marks a rounded value) and the calculator shows up to 9 significant figures. This converts a temperature reading (K = °C + 273.15). A temperature difference converts 1:1: a 1 °C interval is a 1 K interval. Kelvin is written K, not °K, and 0 K is absolute zero.
Each factor is exact by definition, derived from exact definitions, or a documented conventional value — see the methodology and sources.
Conversion Formula
To convert Kelvin to Celsius, subtract 273.15 from the Kelvin value.
Step-by-Step Conversion Guide
Follow these steps to convert kelvin to celsius manually:
Start with your value in kelvin
Example: You want to convert 200 K
Apply the conversion formula
Use the formula: °C = K − 273.15
Calculate the result
200 K = -73.15 °C
Verify your answer
Use our calculator above to double-check your manual calculation.
Quick Mental Math Tip
To convert Kelvin to Celsius, subtract 273.15 from the Kelvin value.
Common Conversions
| Kelvin (K) | Celsius (°C) | Celsius → Kelvin |
|---|---|---|
| 0 K | -273.15 | 0 °C = 273.15 K |
| 100 K | -173.15 | 100 °C = 373.15 K |
| 200 K | -73.15 | 200 °C = 473.15 K |
| 273.15 K | 0 | 273.15 °C = 546.3 K |
| 300 K | 26.85 | 300 °C = 573.15 K |
| 373.15 K | 100 | 373.15 °C = 646.3 K |
| 500 K | 226.85 | 500 °C = 773.15 K |
| 1000 K | 726.85 | 1000 °C = 1,273.15 K |
| 5000 K | 4,726.85 | 5000 °C = 5,273.15 K |
Popular Kelvin to Celsius Conversions
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Frequently Asked Questions
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Conversion factors on this page are either exact by definition, derived from exact definitions, or conventional values in documented use. Each is listed with its source in our conversion methodology and sources, which cites the BIPM SI Brochure, NIST Special Publication 811 and the relevant IEC or national standards. Results are rounded for display only; calculations use full precision.