Temperature Converter
Convert between Celsius, Fahrenheit, and Kelvin instantly with our free temperature converter. See all three temperature scales simultaneously with accurate conversions. Includes common reference points like water freezing/boiling and body temperature. Perfect for cooking, science, travel, and everyday use.
Enter a temperature above to see conversions
Common Reference Points
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How to Use
- 1 Enter your temperature in the input field. You can type any number, including decimals and negative values (e.g., 37.5, -40, 100).
- 2 Select your input scale from the dropdown menu. Choose whether you're entering Celsius (°C), Fahrenheit (°F), or Kelvin (K).
- 3 See all three conversions instantly displayed below. The tool shows your temperature in Celsius, Fahrenheit, and Kelvin simultaneously, updating in real-time as you type.
- 4 Use reference points for quick conversions. Click buttons like "Water Freezing" (0°C/32°F/273.15K) or "Body Temperature" (37°C/98.6°F/310.15K) to instantly see those common temperatures.
- 5 Copy any temperature by clicking the copy button next to each scale. You can also copy all three values at once using the "Copy All" button.
💡 Pro Tip: Temperature scales have different zero points. 0°C = 32°F = 273.15K. Absolute zero (the coldest possible temperature) is -273.15°C, -459.67°F, or 0K.
Frequently Asked Questions
What's the difference between Celsius, Fahrenheit, and Kelvin?
Celsius (°C) is the metric temperature scale used worldwide, with water freezing at 0°C and boiling at 100°C. Fahrenheit (°F) is primarily used in the United States, with water freezing at 32°F and boiling at 212°F. Kelvin (K) is the scientific temperature scale starting at absolute zero (the coldest possible temperature), with water freezing at 273.15K and boiling at 373.15K. Kelvin uses the same degree size as Celsius but has no negative values.
How do I convert between temperature scales?
Temperature conversions use formulas because the scales have different zero points and degree sizes. To convert Celsius to Fahrenheit: multiply by 9/5 and add 32. To convert Fahrenheit to Celsius: subtract 32 and multiply by 5/9. To convert Celsius to Kelvin: add 273.15. Our converter handles all these calculations instantly, showing you all three scales at once so you don't need to remember the formulas.
What are the reference points and why are they useful?
Reference points are common temperatures that help you understand the scales. Water Freezing (0°C/32°F/273.15K) and Water Boiling (100°C/212°F/373.15K) are the defining points for Celsius and Fahrenheit. Body Temperature (37°C/98.6°F/310.15K) is useful for health contexts. Room Temperature (20°C/68°F/293.15K) helps with everyday comfort. These reference points make it easier to mentally estimate temperatures in unfamiliar scales.
Can I enter negative temperatures?
Yes! Negative temperatures are common in Celsius and Fahrenheit (e.g., -40°C = -40°F, the point where both scales meet). However, Kelvin cannot be negative because it starts at absolute zero (0K), the coldest possible temperature. If you enter a temperature below absolute zero in Celsius or Fahrenheit, the Kelvin value will show as invalid or zero, since temperatures below absolute zero are physically impossible.