Celsius ↔ Kelvin Converter
Convert between Celsius and Kelvin instantly
📚 Celsius ↔ Kelvin Conversion Details
Celsius to Kelvin Formula
To convert Celsius to Kelvin, add 273.15 to the Celsius value.
Example: 25°C = 25 + 273.15 = 298.15K
Kelvin to Celsius Formula
To convert Kelvin to Celsius, subtract 273.15 from the Kelvin value.
Example: 300K = 300 - 273.15 = 26.85°C
Bidirectional Conversion
This converter works both ways simultaneously:
- Type in Celsius → Kelvin updates automatically
- Type in Kelvin → Celsius updates automatically
- No buttons to click - works as you type
Temperature Scales
- Celsius (°C): Metric system temperature scale
- Kelvin (K): Absolute temperature scale
- Relation: 0K = -273.15°C
- Increment: 1°C = 1K difference
🌡️ How This Converter Works
This is a bidirectional converter that works in real-time:
- Celsius → Kelvin: When you type in the Celsius field, the Kelvin field automatically updates
- Kelvin → Celsius: When you type in the Kelvin field, the Celsius field automatically updates
- No swapping needed: Both conversions happen simultaneously
- Real-time: Updates happen as you type, no button clicks required
K = °C + 273.15
°C = K - 273.15
// Example 1: Type "25" in Celsius
K = 25 + 273.15 = 298.15
// Example 2: Type "373.15" in Kelvin
°C = 373.15 - 273.15 = 100
📊 Conversion Table
| Celsius (°C) | Kelvin (K) | Description |
|---|---|---|
| -273.15°C | 0K | Absolute Zero |
| 0°C | 273.15K | Water Freezes |
| 20°C | 293.15K | Room Temperature |
| 37°C | 310.15K | Human Body |
| 100°C | 373.15K | Water Boils |
| 500°C | 773.15K | Oven Temperature |
🎓 Key Facts About Celsius and Kelvin
Celsius Scale
• Invented by Anders Celsius in 1742
• Originally called "centigrade"
• Based on water's freezing (0°C) and boiling (100°C) points
• Used worldwide (except in the USA for everyday use)
• Part of the metric system (SI)
Kelvin Scale
• Named after Lord Kelvin (William Thomson)
• Absolute temperature scale (0K = absolute zero)
• No negative values exist
• Official SI unit for temperature
• Used in scientific and engineering applications
• 1K increment equals 1°C increment
❓ Frequently Asked Questions
A: Celsius is a relative scale based on water's freezing/boiling points, while Kelvin is an absolute scale where 0K represents absolute zero (-273.15°C). The size of 1 degree is the same in both scales.
A: 273.15 is the exact conversion factor. 0°C equals 273.15K exactly. Using 273 would give a slight error of 0.15 degrees.
A: No, Kelvin is an absolute temperature scale. 0K is absolute zero, the lowest possible temperature where molecular motion stops. Negative Kelvin temperatures don't exist in conventional systems.
A: Kelvin is preferred for scientific work because it's an absolute scale. However, Celsius is often used in everyday scientific reporting because it's more intuitive for most people.