Temperature Converter
Temperature Conversion Formulas
Celsius to Fahrenheit:
°F = (°C × 9/5) + 32
Fahrenheit to Celsius:
°C = (°F − 32) × 5/9
Celsius to Kelvin:
K = °C + 273.15
Common Reference Points
| Description | Celsius | Fahrenheit | Kelvin |
|---|---|---|---|
| Absolute Zero | −273.15°C | −459.67°F | 0 K |
| Freezing Point of Water | 0°C | 32°F | 273.15 K |
| Room Temperature | 20–22°C | 68–72°F | 293–295 K |
| Body Temperature | 37°C | 98.6°F | 310.15 K |
| Boiling Point of Water | 100°C | 212°F | 373.15 K |
How to Use This Temperature Converter
- Enter a temperature: Input any temperature value in Celsius, Fahrenheit, or Kelvin.
- See instant conversions: The tool automatically converts your temperature to all other scales.
- Copy results: Click to copy any converted value to your clipboard.
- Use reference points: Check the reference table below for common temperature benchmarks.
Temperature Conversion Examples
Freezing Point of Water
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
Boiling Point of Water
100°C = 212°F = 373.15 K
About the Temperature Scales
- Celsius (°C): Water freezes at 0° and boils at 100° (at sea level). Used in most countries and scientific contexts. Named after Swedish astronomer Anders Celsius.
- Fahrenheit (°F): Water freezes at 32° and boils at 212°. Primarily used in the United States and a few other countries. Named after German physicist Daniel Fahrenheit.
- Kelvin (K): Absolute temperature scale where 0 K is absolute zero (-273.15°C). Used in physics, chemistry, and scientific calculations. No degree symbol is used. Named after Irish-Scottish physicist William Thomson, 1st Baron Kelvin.
Quick Conversion Tips
Celsius to Fahrenheit (quick estimate): Double the Celsius value and add 30. For example, 20°C × 2 + 30 = 70°F (actual: 68°F). This gives a rough estimate for everyday temperatures.
Fahrenheit to Celsius (quick estimate): Subtract 30 from Fahrenheit and divide by 2. For example, 70°F - 30 = 40, ÷ 2 = 20°C (actual: 21.1°C).
Kelvin conversions: To convert Celsius to Kelvin, simply add 273.15. To convert Kelvin to Celsius, subtract 273.15.
Absolute zero: The theoretical temperature at which all molecular motion stops. It equals -273.15°C, -459.67°F, or 0 K.
Frequently Asked Questions
How do I convert Celsius to Fahrenheit?
Multiply Celsius by 9/5, then add 32. Formula: °F = (°C × 9/5) + 32
How do I convert Fahrenheit to Celsius?
Subtract 32 from Fahrenheit, then multiply by 5/9. Formula: °C = (°F − 32) × 5/9
When do Celsius and Fahrenheit match?
At -40 degrees. -40°C = -40°F. This is the only temperature where both scales show the same value.