Temperature Converter - Celsius, Fahrenheit, Kelvin
Convert between Celsius, Fahrenheit, and Kelvin instantly. Perfect for weather, cooking, and scientific calculations.
How to Use the Temperature Converter
- Select Source Unit: Choose the temperature unit you want to convert from (Celsius, Fahrenheit, or Kelvin) from the "From" dropdown menu.
- Enter Temperature Value: Type the temperature value you want to convert in the input field. You can enter whole numbers or decimals.
- Select Target Unit: Choose the temperature unit you want to convert to from the "To" dropdown menu.
- View Instant Result: The converted temperature will appear instantly in the result box below. You can copy, favorite, or share the result.
Temperature Conversion Formulas
Celsius to Fahrenheit
°F = (°C × 9/5) + 32Example: 25°C = (25 × 9/5) + 32 = 77°F
Fahrenheit to Celsius
°C = (°F - 32) × 5/9Example: 77°F = (77 - 32) × 5/9 = 25°C
Celsius to Kelvin
K = °C + 273.15Example: 25°C = 25 + 273.15 = 298.15 K
Temperature Reference Table
| Celsius (°C) | Fahrenheit (°F) | Kelvin (K) | Description |
|---|---|---|---|
| -40 | -40 | 233.15 | Same in °C and °F |
| 0 | 32 | 273.15 | Freezing point of water |
| 25 | 77 | 298.15 | Room temperature |
| 37 | 98.6 | 310.15 | Normal body temperature |
| 100 | 212 | 373.15 | Boiling point of water |
Real-World Temperature Conversion Examples
Weather Forecast
Convert weather temperatures between Celsius (used globally) and Fahrenheit (used in the US). For example, 20°C is a pleasant 68°F, perfect for outdoor activities.
Cooking Temperatures
Convert oven temperatures for recipes. Most recipes use Fahrenheit in the US (350°F = 177°C) or Celsius elsewhere. Essential for international cooking.
Body Temperature
Normal body temperature is 98.6°F or 37°C. A fever is typically above 100.4°F (38°C). Important for health monitoring and medical purposes.
Scientific Calculations
Kelvin is used in scientific contexts. Absolute zero is 0 K (-273.15°C or -459.67°F). Essential for physics and chemistry calculations.
Understanding Temperature Scales
What is Temperature?
Temperature measures how hot or cold something is. It's a fundamental physical quantity that affects everything from weather patterns to chemical reactions. Different temperature scales were developed for different purposes and regions throughout history.
Why Three Different Scales?
Celsius is used worldwide for everyday measurements and is based on the freezing and boiling points of water. Fahrenheit is primarily used in the United States and was developed earlier. Kelvin is used in scientific research because it starts at absolute zero, making thermodynamic calculations simpler and avoiding negative temperatures.
Key Reference Points
Water freezes at 0°C (32°F) and boils at 100°C (212°F) at sea level. The point where Celsius and Fahrenheit are equal is -40 degrees, which is the only temperature where both scales match. Absolute zero (-273.15°C) is the coldest possible temperature where molecular motion theoretically stops.
Temperature Conversion Tips
- Remember: -40°C equals -40°F (the only point where both scales match exactly)
- For quick mental conversion: Double Celsius and add 30 to get approximate Fahrenheit (e.g., 20°C ≈ 70°F)
- Kelvin never uses the degree symbol (°) - it's just "K" (e.g., 298 K, not 298°K)
- When converting for cooking, round to the nearest 5 degrees for practical use
- Scientific calculations always use Kelvin to avoid negative temperatures in formulas