Temperature Converter
Convert temperature between Celsius, Fahrenheit, and Kelvin instantly. Perfect for weather, cooking, science, and everyday temperature conversions. Fast, accurate, and completely free.
How Temperature Conversion Works
Temperature is a measure of the average kinetic energy of particles in a substance. Different scales are used around the world to measure temperature. This converter handles the three most common scales:
- Celsius (°C): Used in most countries for everyday weather and cooking. Water freezes at 0°C and boils at 100°C.
- Fahrenheit (°F): Used primarily in the United States. Water freezes at 32°F and boils at 212°F.
- Kelvin (K): The scientific standard. Zero Kelvin (0 K) is absolute zero — the lowest possible temperature.
The conversion formulas are:
Celsius to Fahrenheit: °F = (°C × 9/5) + 32
Fahrenheit to Celsius: °C = (°F − 32) × 5/9
Celsius to Kelvin: K = °C + 273.15
Kelvin to Celsius: °C = K − 273.15
Fahrenheit to Kelvin: K = (°F − 32) × 5/9 + 273.15
Kelvin to Fahrenheit: °F = (K − 273.15) × 9/5 + 32
Common Temperature Reference Points
| Description | Celsius (°C) | Fahrenheit (°F) | Kelvin (K) |
|---|---|---|---|
| Absolute Zero | -273.15 | -459.67 | 0 |
| Water Freezes | 0 | 32 | 273.15 |
| Room Temperature | 20-22 | 68-72 | 293-295 |
| Human Body Temperature | 37 | 98.6 | 310.15 |
| Water Boils | 100 | 212 | 373.15 |
| Baking Oven | 180-200 | 350-400 | 453-473 |
Why Use This Temperature Converter?
- Three Scales: Convert between Celsius, Fahrenheit, and Kelvin instantly.
- Accurate & Fast: Get precise results with up to 4 decimal places.
- Visual Comparison: A bar chart shows the temperature across all three scales.
- Formula Display: See the formula used for the conversion.
- Free & Private: No registration, no data storage.
❓ Temperature Converter FAQ
How do I convert Celsius to Fahrenheit?
Multiply the Celsius temperature by 9/5 (1.8) and add 32. Formula: °F = (°C × 9/5) + 32. For example, 25°C × 9/5 + 32 = 77°F.
How do I convert Fahrenheit to Celsius?
Subtract 32 from the Fahrenheit temperature, then multiply by 5/9. Formula: °C = (°F − 32) × 5/9. For example, 77°F − 32 = 45, 45 × 5/9 = 25°C.
How do I convert Celsius to Kelvin?
Add 273.15 to the Celsius temperature. Formula: K = °C + 273.15. For example, 25°C + 273.15 = 298.15 K.
How do I convert Kelvin to Celsius?
Subtract 273.15 from the Kelvin temperature. Formula: °C = K − 273.15. For example, 298.15 K − 273.15 = 25°C.
How do I convert Fahrenheit to Kelvin?
First convert Fahrenheit to Celsius, then add 273.15. Formula: K = (°F − 32) × 5/9 + 273.15.
How do I convert Kelvin to Fahrenheit?
First convert Kelvin to Celsius, then to Fahrenheit. Formula: °F = (K − 273.15) × 9/5 + 32.
What is the difference between Celsius and Fahrenheit?
Celsius is based on the freezing and boiling points of water (0°C and 100°C). Fahrenheit uses 32°F and 212°F. The scales intersect at -40°, where -40°C = -40°F.
What is absolute zero?
Absolute zero is the lowest possible temperature, where all molecular motion stops. It is 0 K, -273.15°C, and -459.67°F. It cannot be reached, only approached.
What is the boiling point of water?
Water boils at 100°C, 212°F, or 373.15 K at standard atmospheric pressure (sea level). At higher altitudes, the boiling point is lower.
What is the freezing point of water?
Water freezes at 0°C, 32°F, or 273.15 K at standard atmospheric pressure.
What is room temperature in Celsius and Fahrenheit?
Room temperature is typically 20-22°C (68-72°F). The exact value can vary by region and season.
What is normal human body temperature?
Normal human body temperature is approximately 37°C (98.6°F). It can vary slightly from person to person and throughout the day.
What is the Rankine scale?
Rankine is an absolute temperature scale used in engineering. It uses Fahrenheit degrees, with 0°R = 0 K (absolute zero). 1°R = 1°F, but zero is at absolute zero.
How do I convert Celsius to Fahrenheit without a calculator?
A rough estimate: double the Celsius temperature and add 30. For example, 25°C × 2 + 30 = 80°F (actual is 77°F). This is close enough for everyday use.
What is the difference between Kelvin and Celsius?
Kelvin uses the same degree size as Celsius, but starts at absolute zero. 0°C = 273.15 K. Kelvin does not use the degree symbol.
Why do scientists use Kelvin?
Kelvin is the scientific standard because it starts at absolute zero, making calculations in thermodynamics and physics simpler and more consistent.
What is the hottest temperature ever recorded on Earth?
The highest recorded temperature on Earth is 56.7°C (134°F) in Death Valley, California, on July 10, 1913.
What is the coldest temperature ever recorded on Earth?
The lowest recorded temperature on Earth is -89.2°C (-128.6°F) at Vostok Station, Antarctica, on July 21, 1983.
How accurate is this temperature converter?
This converter uses the standard formulas for temperature conversion and can display results with up to 4 decimal places. It is accurate for all practical purposes.
Can I use this converter for cooking temperatures?
Yes. This converter is perfect for converting oven temperatures between Fahrenheit and Celsius for recipes from different countries.
What is the temperature of the sun's surface?
The surface temperature of the sun is approximately 5,500°C (9,932°F or 5,773 K).