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About Temperature Conversions
Our free online temperature conversion calculator instantly converts between Celsius, Fahrenheit, and Kelvin. Whether you're checking weather temperatures, converting recipes, or working on scientific calculations, our tool provides accurate results.
Temperature Scales
Celsius (°C): Used by most countries worldwide for everyday temperatures and scientific applications. Water freezes at 0°C and boils at 100°C.
Fahrenheit (°F): Remains common in the United States for weather and cooking. Water freezes at 32°F and boils at 212°F.
Kelvin (K): Used in science and engineering, starting at absolute zero (-273.15°C).
Common Temperature Conversions
- 0°C = 32°F (freezing point of water)
- 100°C = 212°F (boiling point of water)
- 20°C = 68°F (room temperature)
- 37°C = 98.6°F (body temperature)
Frequently Asked Questions
How do I convert Celsius to Fahrenheit quickly?
For quick mental math: double the Celsius temperature and add 30. For example, 20°C → 20×2=40, 40+30=70°F (actual is 68°F — close!). For exact conversion: °F = (°C × 9/5) + 32.
At what temperature are Celsius and Fahrenheit the same?
Celsius and Fahrenheit are the same at -40°. This is the point where both scales show the same value (-40°C = -40°F). Below -40°, Fahrenheit numbers are lower; above -40°, Fahrenheit numbers are higher.
What is absolute zero?
Absolute zero (0 Kelvin or -273.15°C) is the coldest possible temperature where all molecular motion stops. It's a theoretical limit that cannot be reached in practice. Kelvin is commonly used in scientific and engineering applications where temperatures approach absolute zero.
Why is body temperature 98.6°F?
Normal human body temperature is approximately 98.6°F (37°C). This was established by German physician Carl Reinhold August Wunderlich in 1868. Modern research suggests normal body temperature may vary from person to person and time of day, but 98.6°F remains the standard reference point.
What temperature does water boil at in different units?
Water boils at: 100°C (212°F, 373.15K) at standard atmospheric pressure. The exact boiling point changes with altitude and pressure, which is why recipes may vary for high-altitude cooking.
💡 Quick Reference: Key Temperature Points
| Condition | Celsius | Fahrenheit | Kelvin |
|---|---|---|---|
| Absolute Zero | -273.15°C | -459.67°F | 0 K |
| Water Freezes | 0°C | 32°F | 273.15 K |
| Room Temperature | 20°C | 68°F | 293.15 K |
| Body Temperature | 37°C | 98.6°F | 310.15 K |
| Water Boils | 100°C | 212°F | 373.15 K |
Real-World Applications
Temperature conversions are essential in many everyday situations:
- Weather: Understanding forecasts when traveling between countries using different scales
- Cooking: Converting oven temperatures between Celsius and Fahrenheit
- Health: Monitoring body temperature or understanding fever thresholds
- Science: Laboratory work requiring precise temperature readings
- Travel: Understanding local weather and climate conditions
Our temperature converter handles all these scenarios and more, providing instant, accurate results whenever you need them.