Temperature Converter
Convert between eight temperature scales instantly: Celsius, Fahrenheit, Kelvin, and more. Free interactive chart for science, cooking, and everyday weather.
About This Calculator
The Temperature Converter lets you convert between eight different temperature scales instantly: Celsius (°C), Fahrenheit (°F), Kelvin (K), Rankine (°R), Delisle (°De), Newton (°N), Réaumur (°Ré), and Rømer (°Rø). Simply enter your value, pick the source and target units, and click Convert.
This tool is ideal for scientists, engineers, students, cooks, and anyone who needs quick temperature conversions across different measurement systems. Whether you are converting oven temperatures for a recipe, performing lab calculations, or checking weather data from different countries, this converter handles it all with precise, internationally-standardised formulas.
Temperature Conversion Formulas
The converter uses the following standard formulas internally. All conversions first go through Celsius as the intermediate scale:
- Celsius to Fahrenheit: °F = (°C × 9/5) + 32
- Celsius to Kelvin: K = °C + 273.15
- Celsius to Rankine: °R = (°C + 273.15) × 9/5
- Celsius to Delisle: °De = (100 − °C) × 3/2
- Celsius to Newton: °N = °C × 33/100
- Celsius to Réaumur: °Ré = °C × 4/5
- Celsius to Rømer: °Rø = °C × 21/40 + 7.5
Regional Notes
India: Celsius is the standard for weather, cooking, and industrial temperature measurement. Kelvin is used in scientific and engineering contexts.
United States: Fahrenheit remains the primary scale for everyday use, including weather forecasts, cooking, and body temperature. Celsius is common in scientific fields.
United Kingdom: Celsius is widely used for weather and general purposes, though older generations may still reference Fahrenheit. Oven temperatures are typically given in Celsius and occasionally gas marks. Kelvin is standard in science.
Frequently Asked Questions
How do I use the Temperature Converter?
Enter a numeric temperature value, select the source unit (e.g. Celsius), choose the target unit (e.g. Fahrenheit), and click Convert. The result and a bar chart comparing all eight temperature units will appear instantly.
What temperature units does the calculator support?
The converter supports eight temperature scales: Celsius (°C), Fahrenheit (°F), Kelvin (K), Rankine (°R), Delisle (°De), Newton (°N), Réaumur (°Ré), and Rømer (°Rø). Each scale is converted using the standard scientific formulas.
How do I convert Celsius to Fahrenheit?
The formula is: °F = (°C × 9/5) + 32. For example, 100°C equals 212°F. Our calculator handles this automatically — just select Celsius as the source and Fahrenheit as the target.
What is the difference between Celsius and Kelvin?
Kelvin is the SI unit for temperature and starts at absolute zero (0 K = -273.15°C), where molecular motion stops. Celsius is derived from Kelvin: °C = K − 273.15. One degree Celsius equals one Kelvin in magnitude.
Is the Temperature Converter accurate?
Yes, all conversions use the internationally accepted scientific formulas established by the International System of Units (SI) and the International Temperature Scale of 1990 (ITS-90). Results are displayed to two decimal places.
Can I convert temperatures for cooking?
Yes. Oven temperatures are often given in Celsius or Fahrenheit. Use this converter to switch between them. For example, 180°C (common baking temperature) equals 356°F. Indian recipes typically use °C, US recipes use °F, and UK recipes use °C or gas marks.
What is absolute zero and which scales use it?
Absolute zero (0 K) is the lowest possible temperature where all molecular motion ceases. It equals -273.15°C, -459.67°F, and 0°R (Rankine). The Kelvin and Rankine scales both start at absolute zero, making them true ratio scales.
Why are there different temperature scales?
Different scales were developed historically for practical purposes. Celsius (°C) is used worldwide for everyday temperatures, Fahrenheit (°F) is standard in the US, Kelvin (K) is the scientific SI unit, and the remaining scales (Rankine, Delisle, Newton, Réaumur, Rømer) are used in specialised scientific and historical contexts.