Temperature Conversion
Convert temperature between Celsius, Fahrenheit, Kelvin, Rankine, and Réaumur scales. Used in weather forecasting, cooking, science, and HVAC engineering. See also our Celsius to Fahrenheit and Kelvin to Celsius converters.
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Popular Temperature Converters:
What is a Temperature Converter?
A temperature converter is a tool that converts values between Celsius, Fahrenheit, Kelvin, and other temperature scales. It is essential for cooking, weather interpretation, scientific research, and international travel where different temperature scales are used.
How to Convert Temperature Units
Select the temperature scale you want to convert from and the scale you want to convert to using the dropdown menus. Enter your temperature value in the input field and the converter will instantly calculate the equivalent temperature. You can also use the popular conversion links below for common conversions like Celsius to Fahrenheit.
Temperature Conversion Formulas
History of Temperature Measurement
Daniel Fahrenheit developed the mercury thermometer and his temperature scale in 1714. Anders Celsius proposed the centigrade scale in 1742, later renamed Celsius. Lord Kelvin introduced the absolute temperature scale in 1848, starting at absolute zero where all molecular motion ceases.
About This Temperature Converter
This temperature converter supports Celsius, Fahrenheit, Kelvin, Rankine, Reaumur, and Triple point of water. Unlike other unit converters, temperature conversion requires formulas with offsets rather than simple multiplication factors.
Frequently Asked Questions
How do I convert Celsius to Fahrenheit?
Multiply the Celsius temperature by 9/5 (or 1.8) and add 32. For example, 25°C = (25 × 1.8) + 32 = 77°F.
What is absolute zero?
Absolute zero is 0 Kelvin (−273.15°C or −459.67°F). It is the theoretical temperature where all molecular motion stops and is the lowest possible temperature.
What temperature is the same in Celsius and Fahrenheit?
−40 degrees is the same in both Celsius and Fahrenheit. This is the only point where the two scales intersect.
Why does the US use Fahrenheit?
The US adopted Fahrenheit before the metric system became widespread. Fahrenheit offers more granularity for everyday weather temperatures since its degree increments are smaller than Celsius degrees.
What is the boiling point of water in all scales?
Water boils at 100°C, 212°F, 373.15 K, 671.67°R, and 80°r (Reaumur) at standard atmospheric pressure.
Metric Conversion Factor Tables for Temperature Converter
| Units to convert | Multiply By The Number | Convert as Unit |
|---|---|---|
| Fahrenheit (°F) | (°F − 32) / 1.8 | Celsius (°C) |
| Celsius (°C) | (°C × 1.8) + 32 | Fahrenheit (°F) |
| Celsius (°C) | Add 273.15 | Kelvin (K) |
| Kelvin (K) | Subtract 273.15 | Celsius (°C) |
Temperatureconverters & it's abbreviations
| Unit | Abbreviation | Unit | Abbreviation | Unit | Abbreviation |
|---|---|---|---|---|---|
| kelvin | K | Celsius | °C | Fahrenheit | °F |
| Rankine | °R | Reaumur | °r | Triple point of water | - |
Complete list of Temperature conversion units and its conversion.
- 0 Celsius [°C] = 32 Fahrenheit [°F]
celsius to fahrenheit → - 0 Celsius [°C] = 273.15 kelvin [K]
celsius to kelvin → - 0 Celsius [°C] = 491.67 Rankine [°R]
celsius to rankine →
- 32 Fahrenheit [°F] = 491.67 Rankine [°R]
fahrenheit to rankine → - 32 Fahrenheit [°F] = 0 Reaumur [°r]
fahrenheit to reaumur → - 273.15 kelvin [K] = 0 Celsius [°C]
kelvin to celsius →
- 491.67 Rankine [°R] = 0 Celsius [°C]
rankine to celsius → - 491.67 Rankine [°R] = 32 Fahrenheit [°F]
rankine to fahrenheit → - 491.67 Rankine [°R] = 273.15 kelvin [K]
rankine to kelvin →
- 0 Reaumur [°r] = 273.15 kelvin [K]
reaumur to kelvin → - 0 Reaumur [°r] = 491.67 Rankine [°R]
reaumur to rankine →
- 0 Celsius [°C] = 0 Reaumur [°r]
celsius to reaumur → - 32 Fahrenheit [°F] = 0 Celsius [°C]
fahrenheit to celsius → - 32 Fahrenheit [°F] = 273.15 kelvin [K]
fahrenheit to kelvin →
- 273.15 kelvin [K] = 32 Fahrenheit [°F]
kelvin to fahrenheit → - 273.15 kelvin [K] = 491.67 Rankine [°R]
kelvin to rankine → - 273.15 kelvin [K] = 0 Reaumur [°r]
kelvin to reaumur →
- 491.67 Rankine [°R] = 0 Reaumur [°r]
rankine to reaumur → - 0 Reaumur [°r] = 0 Celsius [°C]
reaumur to celsius → - 0 Reaumur [°r] = 32 Fahrenheit [°F]
reaumur to fahrenheit →