Temperature Converter – Celsius, Fahrenheit, Kelvin & More
Use our free online temperature converter to quickly convert temperatures between Celsius (°C), Fahrenheit (°F), Kelvin (K), Rankine (°R), Réaumur (°Ré), Delisle (°De), Newton (°N), Rømer (°Rø) and other temperature scales. Enter a temperature, select the original unit and choose the temperature scale you want to convert to.
Smart Unit Calc provides accurate temperature conversion for everyday calculations, science, engineering, weather, cooking, industrial applications, education and international temperature comparisons.
Temperature Conversion Calculator
Popular Temperature Conversions
What Is Temperature?
Temperature is a physical quantity that describes how hot or cold an object, substance or environment is. It is an important measurement used in weather forecasting, cooking, science, engineering, manufacturing, medicine, refrigeration, industrial processing and everyday life.
Several temperature scales are used around the world. The most common are Celsius, Fahrenheit and Kelvin. Other scales such as Rankine, Réaumur, Delisle, Newton and Rømer are less common but are useful for historical, scientific and specialized calculations.
Temperature Scales and Units
| Temperature Scale | Symbol | Common Use |
|---|---|---|
| Celsius | °C | Weather, daily life, science |
| Fahrenheit | °F | United States and some other regions |
| Kelvin | K | Science, physics and engineering |
| Rankine | °R | Engineering and thermodynamics |
| Réaumur | °Ré | Historical and specialized applications |
| Delisle | °De | Historical temperature scale |
| Newton | °N | Historical scientific scale |
| Rømer | °Rø | Historical temperature scale |
Celsius to Fahrenheit Converter
Celsius to Fahrenheit conversion is one of the most frequently searched temperature conversions. It is commonly required when comparing weather temperatures, cooking temperatures, scientific measurements and international temperature data.
Examples
| Celsius | Fahrenheit |
|---|---|
| 0 °C | 32 °F |
| 10 °C | 50 °F |
| 20 °C | 68 °F |
| 25 °C | 77 °F |
| 37 °C | 98.6 °F |
| 100 °C | 212 °F |
Fahrenheit to Celsius Converter
Fahrenheit to Celsius conversion is commonly used when converting weather reports, cooking temperatures, scientific data and international measurements.
Examples
| Fahrenheit | Celsius |
|---|---|
| 32 °F | 0 °C |
| 50 °F | 10 °C |
| 68 °F | 20 °C |
| 77 °F | 25 °C |
| 98.6 °F | 37 °C |
| 212 °F | 100 °C |
Celsius to Kelvin Conversion
Kelvin is the SI base unit of thermodynamic temperature. Kelvin is widely used in physics, chemistry, engineering, thermodynamics and scientific research.
For example, 0 °C equals 273.15 K, while 100 °C equals 373.15 K.
Kelvin to Celsius Conversion
Kelvin temperatures do not use the degree symbol. For example, 273.15 K is equal to 0 °C and 373.15 K is equal to 100 °C.
Fahrenheit to Kelvin Conversion
To convert Fahrenheit to Kelvin, first convert Fahrenheit to Celsius and then add 273.15.
Kelvin to Fahrenheit Conversion
Rankine Temperature Converter
Rankine is an absolute temperature scale used primarily in engineering and thermodynamics. It is related to Fahrenheit in the same way Kelvin is related to Celsius.
Réaumur Temperature Converter
The Réaumur scale is a historical temperature scale in which the freezing point of water is 0 °Ré and the boiling point of water is 80 °Ré under standard atmospheric pressure.
Delisle Temperature Converter
The Delisle temperature scale is a historical scale created by Joseph-Nicolas Delisle. Unlike Celsius and Fahrenheit, its values decrease as temperature increases.
Newton Temperature Converter
The Newton temperature scale was proposed by Isaac Newton. It is a historical temperature scale that can still be useful when studying historical scientific measurement systems.
Rømer Temperature Converter
The Rømer scale is a historical temperature scale developed by Ole Rømer. Its conversion is based on fixed reference points associated with the freezing and boiling temperatures of water.
Common Temperature Conversion Chart
| Celsius | Fahrenheit | Kelvin | Rankine |
|---|---|---|---|
| -40 °C | -40 °F | 233.15 K | 419.67 °R |
| -20 °C | -4 °F | 253.15 K | 455.67 °R |
| 0 °C | 32 °F | 273.15 K | 491.67 °R |
| 10 °C | 50 °F | 283.15 K | 509.67 °R |
| 20 °C | 68 °F | 293.15 K | 527.67 °R |
| 25 °C | 77 °F | 298.15 K | 536.67 °R |
| 30 °C | 86 °F | 303.15 K | 545.67 °R |
| 37 °C | 98.6 °F | 310.15 K | 558.27 °R |
| 100 °C | 212 °F | 373.15 K | 671.67 °R |
Where Temperature Conversion Is Used
Weather and Climate
Temperature conversion is frequently required when comparing weather information from countries that use Celsius and Fahrenheit. Converting weather temperatures makes forecasts easier to understand across different regions.
Cooking and Baking
Recipes can specify oven temperatures in Celsius or Fahrenheit. A temperature converter helps convert baking and cooking temperatures accurately.
Science and Education
Celsius, Kelvin and other temperature scales are frequently used in chemistry, physics, laboratory experiments and scientific calculations.
Engineering
Engineers use temperature measurements in thermodynamics, mechanical engineering, HVAC systems, manufacturing and industrial processes.
Industrial Applications
Temperature conversion is important for heating systems, refrigeration, industrial equipment, process control and thermal engineering.
What Is Absolute Zero?
Absolute zero is the lowest theoretical temperature. It is defined as 0 Kelvin.
| Scale | Absolute Zero |
|---|---|
| Celsius | -273.15 °C |
| Fahrenheit | -459.67 °F |
| Kelvin | 0 K |
| Rankine | 0 °R |
How to Use the Temperature Converter
- Enter the temperature you want to convert.
- Select the original temperature scale.
- Select the temperature scale you want to convert to.
- The converted temperature will be calculated automatically.
- Use the swap button to reverse the conversion.
- Use the Copy Result button to copy the calculated result.
Temperature Converter FAQs
How do I convert Celsius to Fahrenheit?
Multiply the Celsius value by 9/5 and add 32. The formula is:
How do I convert Fahrenheit to Celsius?
Subtract 32 from Fahrenheit and multiply the result by 5/9.
How do I convert Celsius to Kelvin?
Add 273.15 to the Celsius temperature.
Is Kelvin the same as Celsius?
Kelvin and Celsius have the same size temperature interval, but their zero points are different. A temperature of 0 K is equal to -273.15 °C.
What temperature is 100 Celsius in Fahrenheit?
100 °C equals 212 °F.
What temperature is 32 Fahrenheit in Celsius?
32 °F equals 0 °C.
What is 20 Celsius in Fahrenheit?
20 °C equals 68 °F.
What is 37 Celsius in Fahrenheit?
37 °C equals 98.6 °F.
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