Temperature Converter

How to Use This Tool

The Professional Temperature Converter makes it easy to switch between Celsius, Fahrenheit, Kelvin, Rankine, and other temperature scales. Enter any temperature in the input field, then select your starting unit from the dropdown. Use the quick select buttons for common temperatures like water freezing, room temperature, or body temperature. You can also adjust the precision to control how many decimal places you see.

All conversions appear in real time as you type. You can see how one temperature scale compares to others instantly. The tool includes specialized units like Gas Mark for cooking applications. To make results easier to understand, the tool adds real-world examples that show what each temperature feels like in daily life. The visual temperature scale uses colors to help you quickly understand if a temperature is cold, comfortable, or hot. Copy any result directly to your clipboard for quick sharing or calculations.

Temperature Conversion Facts

1. Celsius (°C), also called centigrade, is based on the freezing point (0°C) and boiling point (100°C) of water at standard atmospheric pressure. It's the most widely used temperature scale in the world and is part of the International System of Units (SI).
2. Fahrenheit (°F) was developed by Daniel Gabriel Fahrenheit in 1724. Water freezes at 32°F and boils at 212°F. It's primarily used in the United States, Belize, and some Caribbean territories. The conversion formula is °F = (°C × 9/5) + 32.
3. Kelvin (K) is the base unit of temperature in the International System of Units (SI). It starts at absolute zero (-273.15°C), the theoretical point where all molecular motion stops. Scientists use Kelvin because it's an absolute temperature scale with no negative numbers.
4. Rankine (°R) is an absolute temperature scale like Kelvin, but it uses Fahrenheit-sized degrees. Absolute zero is 0°R, which equals -459.67°F. It's mainly used in engineering applications in the United States, particularly in thermodynamics.
5. Delisle (°De) was created by Joseph-Nicolas Delisle in 1732. Unusually, the scale is inverted—higher numbers represent colder temperatures. Water boils at 0°De and freezes at 150°De. It was used in Russia for nearly a century but is now obsolete.
6. Newton (°N) was developed by Isaac Newton around 1700. Water freezes at 0°N and boils at 33°N. While historically interesting as one of the early temperature scales, it's not used in modern applications.
7. Réaumur (°Ré) was created by René Antoine Ferchault de Réaumur in 1730. Water freezes at 0°Ré and boils at 80°Ré. It was widely used in Europe, especially in France and Germany, until the late 19th century when Celsius became standard.
8. Rømer (°Rø) was developed by Ole Christensen Rømer in 1701. Water freezes at 7.5°Rø and boils at 60°Rø. This scale influenced the development of both Fahrenheit and Celsius scales, but it's no longer used practically.
9. Absolute zero (-273.15°C, -459.67°F, 0 K) is the theoretical temperature at which all atomic and molecular motion stops. It's impossible to reach in practice, but scientists have cooled materials to within billionths of a degree of absolute zero.
10. Gas Mark is a temperature scale used on gas ovens, primarily in the UK and Ireland. Gas Mark 1 equals about 275°F (135°C), and each subsequent mark increases by about 25°F (14°C). Gas Mark 4 (350°F/180°C) is considered moderate heat for baking.

Cooking and Baking

In cooking, temperature control is crucial for food safety and quality. Different cooking methods require specific temperatures—slow roasting at 120-160°C, baking bread at 200-220°C, or deep frying at 175-190°C. Understanding these conversions helps when following international recipes.

Weather and Climate

Weather reports use different temperature scales depending on location. Most of the world uses Celsius, while the United States uses Fahrenheit. Understanding both scales helps when traveling or reading international weather forecasts and climate data.

Science and Engineering

Scientific research often requires Kelvin or Celsius for calculations, while engineering applications in the US may use Rankine or Fahrenheit. Accurate temperature conversion is essential for material properties, chemical reactions, and thermodynamic calculations.

Medical and Health

Body temperature varies slightly by measurement method and individual, but normal ranges are 36.1-37.2°C (97-99°F). Fever begins around 37.8°C (100°F). Medical equipment and research may use different temperature scales depending on the application and location.