Celsius Converter
Convert Celsius (°C) to Fahrenheit, Kelvin, Rankine, Delisle, Newton, Réaumur, and Rømer instantly. Free online temperature converter for students, scientists, and everyday use.
About This Calculator
The Celsius Converter instantly converts any temperature value from degrees Celsius (°C) into seven other temperature scales: Fahrenheit (°F), Kelvin (K), Rankine (°R), Delisle (°De), Newton (°N), Réaumur (°Ré), and Rømer (°Rø). Whether you are a student studying thermodynamics, a scientist working with SI units, a chef following an international recipe, or just curious about weather temperatures worldwide, this converter provides accurate results in seconds.
The Celsius scale, also known as the Centigrade scale, sets 0°C at the freezing point of water and 100°C at the boiling point. Conversions to other scales follow straightforward linear formulas. For Fahrenheit, multiply by 9/5 and add 32. For Kelvin, the SI base unit, simply add 273.15. The Rankine scale (used in US engineering) multiplies by 9/5 and adds 491.67. Historical scales like Delisle, Newton, Réaumur, and Rømer each use their own unique conversion factors derived from the Celsius base.
Regional Notes
India (IN): Celsius is the standard temperature scale used in weather reports, cooking, and daily life. Educational curricula use Celsius for science and mathematics.
United States (US): Fahrenheit is the primary scale for weather and daily temperature reporting, though Celsius is used in scientific contexts. This converter helps US users quickly convert Celsius values they encounter in science or international travel.
United Kingdom (UK): Celsius is widely used for weather and daily life, though older generations may still reference Fahrenheit. Kelvin is standard in scientific research and education.
Frequently Asked Questions
How do I convert Celsius to Fahrenheit?
To convert Celsius to Fahrenheit, multiply the Celsius temperature by 9/5 and then add 32. For example, 100°C × 9/5 + 32 = 212°F.
How do I convert Celsius to Kelvin?
To convert Celsius to Kelvin, add 273.15 to the Celsius temperature. For example, 25°C + 273.15 = 298.15 K. Kelvin is the SI base unit of temperature and does not use the degree symbol.
How do I convert Celsius to Rankine?
To convert Celsius to Rankine, multiply the Celsius temperature by 9/5 and then add 491.67. Rankine is an absolute temperature scale commonly used in engineering, especially in the United States.
What are Delisle, Newton, Réaumur, and Rømer scales?
These are historical temperature scales. Delisle (°De) uses 0°De at boiling water and 150°De at freezing. Newton (°N) defines 0°N at freezing and 33°N at boiling. Réaumur (°Ré) sets 0°Ré at freezing and 80°Ré at boiling. Rømer (°Rø) sets 0°Rø at freezing and 60°Rø at boiling.
Is this Celsius converter free to use?
Yes, all calculators on Calculy are completely free to use with no registration or hidden fees. You can convert temperatures as many times as you need.
What is the Celsius scale based on?
The Celsius scale, invented in 1742 by Anders Celsius, sets 0°C as the freezing point of water and 100°C as the boiling point of water at standard atmospheric pressure. The range between these points is divided into 100 equal degrees, giving it the alternative name Centigrade.
Can I use this converter on mobile devices?
Yes, the Celsius Converter is fully responsive and works on all devices including smartphones, tablets, and desktop computers. The interface adapts to your screen size for easy use.