Temperature Converter
Temperature Converter easily converts different units of temperature whether you’re working with Celsius °C, Fahrenheit °F, Kelvin K, Rankine °R, or Reaumur °Re.
Using our user-friendly interface, input the temperature value in your desired unit, and our converter will instantly provide you with the equivalent temperature in all other units. Our Temperature Converter will simplify your calculations and ensure accuracy.
What is Temperature?
Temperature is a physical quantity that expresses quantitatively the perceptions of hotness and coldness. It is measured with a thermometer. Temperature is typically measured using various scales, including Celsius °C, Fahrenheit °F, Kelvin K, Rankine °R, or Reaumur °Re.
The seven base SI (International System of Units) units are the fundamental units of measurement defined for physical quantities. Temperature is one of these quantities, and its base unit in the SI system is Kelvin (K). Below are the seven base SI units along with their corresponding physical quantities:
- Length – Meter (m)
- Mass – Kilogram (kg)
- Time – Second (s)
- Electric current – Ampere (A)
- Thermodynamic temperature – Kelvin (K)
- Amount of substance – Mole (mol)
- Luminous intensity – Candela (cd)
In this list, Kelvin (K) is used to measure thermodynamic temperature, which is the absolute temperature scale starting from absolute zero, the point where molecular motion stops.
Temperature Measurement Units
Temperature can be measured using different units depending on the region, application, or scientific preference. Below is a detailed explanation of the main temperature measurement units:
- Celsius °C
- Fahrenheit °F
- Kelvin K
- Rankine °R
- Reaumur °Re
Celsius (°C)
Celsius (°C) is a temperature scale used to measure temperature, where 0°C represents the freezing point of water and 100°C represents the boiling point of water at standard atmospheric pressure (1 atmosphere or 101.325 kPa). The Celsius scale is widely used around the world for everyday temperature measurements, especially in most countries that follow the metric system.
Fahrenheit (°F)
Fahrenheit (°F) is a temperature scale mainly used in the United States and some Caribbean countries. In this scale, the freezing point of water is defined as 32°F, and the boiling point is 212°F at standard atmospheric pressure. The Fahrenheit scale is less commonly used worldwide compared to Celsius. It was proposed in 1724 by European physicist Daniel Gabriel Fahrenheit (1686–1736) and uses the degree Fahrenheit (symbol: °F) as its unit. The defining point of 0°F was originally established as the freezing temperature of a brine solution made from water, ice, and ammonium chloride.
Kelvin (K)
Kelvin (K) is the base unit of temperature in the International System of Units (SI). It is named after the Scottish physicist William Thomson, 1st Baron Kelvin, who made significant contributions to the field of thermodynamics. The Kelvin scale is an absolute temperature scale, starting at absolute zero, the point at which all molecular motion stops.
Rankine (°R)
Rankine (°R or Ra) is a temperature scale used primarily in engineering fields, particularly in the United States, where it is often applied in thermodynamics and fluid mechanics. Named after the Scottish engineer William John Macquorn Rankine, the Rankine scale is an absolute temperature scale similar to Kelvin, but it is based on the Fahrenheit degree rather than the Celsius degree.
Reaumur (°Re)
Reaumur (°Re) is a temperature scale that was proposed by the French scientist René Antoine Ferchault de Réaumur in the early 18th century. It was popular in France and some parts of Europe during the 18th and 19th centuries but fell out of favor with the adoption of the Celsius scale. In the Reaumur scale, the freezing point of water is defined as 0 °Re, and the boiling point is defined as 80 °Re at standard atmospheric pressure.
Note: Here’s a table summarizing the freezing point, boiling point, and body temperature in various temperature scales:
| Temperature Scale | Freezing Point | Boiling Point | Body Temperature |
| Celsius (°C) | 0 °C | 100 °C | 37 °C |
| Fahrenheit (°F) | 32 °F | 212 °F | 98.6 °F |
| Kelvin (K) | 273.15 K | 373.15 K | 310.15 K |
| Rankine (°R) | 491.67 °R | 671.67 °R | 558.67 °R |
| Reaumur (°Re) | 0 °Re | 80 °Re | 30 °Re |
Temperature Conversion Formula
1. Celsius (°C) to Other Temperature Scales
| Conversion | Formula |
| Celsius (°C) to Fahrenheit (°F) | °F = (°C * 9/5) + 32 |
| Celsius (°C) to Kelvin (K) | K = °C + 273.15 |
| Celsius (°C) to Rankine (°R) | °R = (°C + 273.15) * 9/5 |
| Celsius (°C) to Reaumur (°Re) | °Re = °C * 4/5 |
2. Fahrenheit (°F) to Other Temperature Scales
| Conversion | Formula |
| Fahrenheit (°F) to Celsius (°C) | C = (°F – 32) * 5/9 |
| Fahrenheit (°F) to Kelvin (K) | K = (°F + 459.67) * 5/9 |
| Fahrenheit (°F) to Rankine (°R) | °R = °F + 459.67 |
| Fahrenheit (°F) to Reaumur (°Re) | °Re = (°F – 32) * 4/9 |
3. Kelvin (K) to Other Temperature Scales
| Conversion | Formula |
| Kelvin (K) to Celsius (°C) | °C = K – 273.15 |
| Kelvin (K) to Fahrenheit (°F) | °F = (K * 9/5) – 459.67 |
| Kelvin (K) to Rankine (°R) | °R = K * 9/5 |
| Kelvin (K) to Reaumur (°Re) | °Re = (K – 273.15) * 4/5 |
4. Rankine (°R) to Other Temperature Scales
| Conversion | Formula |
| Rankine (°R) to Celsius (°C) | °C = (°R – 491.67) * 5/9 |
| Rankine (°R) to Fahrenheit (°F) | °F = °R – 459.67 |
| Rankine (°R) to Kelvin (K) | K = °R * 5/9 |
| Rankine (°R) to Reaumur (°Re) | °Re = (°R – 491.67) * 4/9 |
5. Reaumur (°Re) to Other Temperature Scales
| Conversion | Formula |
| Reaumur (°Re) to Celsius (°C) | °C = °Re * 5/4 |
| Reaumur (°Re) to Fahrenheit (°F) | °F = (°Re * 9/4) + 32 |
| Reaumur (°Re) to Kelvin (K) | K = (°Re * 5/4) + 273.15 |
| Reaumur (°Re) to Rankine (°R) | °R = (°Re * 9/4) + 491.67 |
How to Use the Temperature Converter Tool
Using the Temperature Converter Tool is very simple. Here’s a step-by-step guide:
Input Boxes: There are five input boxes available, each corresponding to a different unit of temperature:
- Celsius (°C)
- Fahrenheit (°F)
- Kelvin (K)
- Rankine (°R)
- Reaumur (°Re)
Enter Temperature: If you want to convert from Celsius to Fahrenheit, enter the desired Celsius value in the Celsius input box.
Automatic Conversion: Once you enter the value, the tool automatically calculates and displays the equivalent temperatures in the other four units.
View Results: The results will appear in the corresponding output boxes for Fahrenheit, Kelvin, Rankine, and Reaumur, allowing you to see the conversions instantly.
Conclusion: Our Temperature Converter will simplify your calculations and ensure accuracy.
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