Kelvin ↔ Celsius Converter
Convert between Kelvin and Celsius instantly
Enter Kelvin value to convert to Celsius
Enter Celsius value to convert to Kelvin
Conversion Result
273.15 K = 0 °C
Water Freezing Point • 32 °F • 491.67 °R
📚 Kelvin ↔ Celsius Conversion Details
Kelvin to Celsius Formula
°C = K - 273.15
To convert Kelvin to Celsius, subtract 273.15 from the Kelvin temperature.
Celsius to Kelvin Formula
K = °C + 273.15
To convert Celsius to Kelvin, add 273.15 to the Celsius temperature.
Bidirectional Conversion
This converter works both ways simultaneously:
- Type in Kelvin → Celsius updates automatically
- Type in Celsius → Kelvin updates automatically
- No buttons to click - works as you type
Key Temperature Points
- Absolute Zero: 0 K = -273.15 °C
- Water Freezes: 273.15 K = 0 °C
- Room Temp: ~293.15 K = ~20 °C
- Water Boils: 373.15 K = 100 °C
🌡️ How This Converter Works
This is a bidirectional converter that works in real-time:
- Kelvin → Celsius: When you type in the Kelvin field, the Celsius field automatically updates
- Celsius → Kelvin: When you type in the Celsius field, the Kelvin field automatically updates
- No swapping needed: Both conversions happen simultaneously
- Real-time: Updates happen as you type, no button clicks required
// Bidirectional Conversion Logic:
celsius = kelvin - 273.15
kelvin = celsius + 273.15
// Example 1: Type "300" in Kelvin
celsius = 300 - 273.15 = 26.85°C
// Example 2: Type "25" in Celsius
kelvin = 25 + 273.15 = 298.15 K
celsius = kelvin - 273.15
kelvin = celsius + 273.15
// Example 1: Type "300" in Kelvin
celsius = 300 - 273.15 = 26.85°C
// Example 2: Type "25" in Celsius
kelvin = 25 + 273.15 = 298.15 K
📊 Important Temperature Reference Points
| Description | Kelvin (K) | Celsius (°C) | Fahrenheit (°F) |
|---|---|---|---|
| Absolute Zero | 0 K | -273.15 °C | -459.67 °F |
| Water Freezing Point | 273.15 K | 0 °C | 32 °F |
| Room Temperature | 293.15 K | 20 °C | 68 °F |
| Human Body Temperature | 310.15 K | 37 °C | 98.6 °F |
| Water Boiling Point | 373.15 K | 100 °C | 212 °F |
❓ Frequently Asked Questions
Q: What is the relationship between Kelvin and Celsius?
A: The Kelvin scale starts at absolute zero (0 K) and uses the same degree size as Celsius. To convert: °C = K - 273.15.
Q: What is 0 Kelvin in Celsius?
A: 0 Kelvin is -273.15 °C, which is absolute zero - the coldest possible temperature.
Q: Why is 273.15 used in the conversion?
A: 273.15 is the difference between the Kelvin and Celsius scales. 0 °C (water freezing) equals 273.15 K.
Q: Is Kelvin ever negative?
A: No, the Kelvin scale starts at absolute zero (0 K) and only has positive values. Celsius can be negative.