Temperature Unit Conversion Tool
In scientific research, engineering design, weather forecasting, international travel, and even daily life, we often need to convert between different temperature units. However, the conversion formulas among Celsius, Fahrenheit, Kelvin, and Rankine can be complex and easy to mix up—don’t worry!
Our professional Temperature Unit Converter supports instant, high-precision bidirectional conversion among the following four internationally used temperature scales:
- Celsius (°C) — the most widely used scale for everyday temperatures worldwide
- Kelvin (K) — the thermodynamic temperature standard in the International System of Units (SI)
- Fahrenheit (°F) — commonly used in the United States and some Caribbean countries
- Rankine (°R) — an absolute temperature scale used in engineering thermodynamics (imperial system)
Just enter a value, select the original and target units, and get an accurate result instantly—no need to memorize formulas or risk calculation errors!
🔁 Core Temperature Conversion Formulas
Below are the exact conversion relationships among the four scales:
| Conversion Direction | Formula |
|---|---|
| °C → K | K = °C + 273.15 |
| K → °C | °C = K − 273.15 |
| °C → °F | °F = (°C × 9/5) + 32 |
| °F → °C | °C = (°F − 32) × 5/9 |
| °F → °R | °R = °F + 459.67 |
| °R → °F | °F = °R − 459.67 |
| K → °R | °R = K × 9/5 |
| °R → K | K = °R × 5/9 |
| °C → °R | °R = (°C + 273.15) × 9/5 |
| °F → K | K = (°F − 32) × 5/9 + 273.15 |
💡 Did You Know?
- 0 K (absolute zero) is the theoretical lowest possible temperature, equal to −273.15°C or −459.67°F.
- Both Kelvin (K) and Rankine (°R) are absolute temperature scales—they have no negative values.
🌡️ Common Temperature Reference Table
| Celsius (°C) | Kelvin (K) | Fahrenheit (°F) | Rankine (°R) |
|---|---|---|---|
| −273.15 | 0 | −459.67 | 0 |
| −40 | 233.15 | −40 | 419.67 |
| 0 | 273.15 | 32 | 491.67 |
| 25 | 298.15 | 77 | 536.67 |
| 37 | 310.15 | 98.6 | 558.27 |
| 100 | 373.15 | 212 | 671.67 |
| 500 | 773.15 | 932 | 1,391.67 |
✅ Key Reference Points
- −40° is the unique temperature where °C and °F values are numerically equal
- 0°C = freezing point of water; 100°C = boiling point of water (at standard atmospheric pressure)
- 37°C ≈ normal human body temperature
✨ Tool Advantages
- Full coverage of all 4 temperature scales: seamless bidirectional conversion between °C, K, °F, and °R
- Real-time calculation: results update instantly as you type—no “Convert” button needed
- High-precision engine: retains multiple decimal places to meet scientific and engineering requirements
- Completely free · No ads · No registration required
- Responsive interface: works flawlessly on smartphones, tablets, and desktop computers
🌐 Try It Now!
🌡️ Whether you're running experiments, checking the weather, reading scientific literature, or traveling abroad—this tool is your perfect temperature companion!
🔥 From freezing cold to scorching heat—master every degree with precision. Give it a try today!