Temperature Converter

About the Temperature Converter

Convert a value from any supported unit and instantly see the equivalent in Celsius (°C), Fahrenheit (°F), Kelvin (K), Rankine (°R), and Réaumur (°Ré).

Best practices

• Know your context: science typically uses Kelvin; weather uses °C/°F.
• Note rounding: conversions can produce long decimals—round sensibly for your use case.
• Respect physical limits: temperatures cannot be below absolute zero (0 K, −273.15 °C).
• Document units in reports to avoid ambiguity.

How to Use

1. Enter the temperature value you want to convert in the "Temperature Value" field.
2. Select the unit you are converting from using the "From Unit" dropdown.
3. Click the "Convert Temperature" button.
4. The results section will update to show the equivalent temperature in all supported units.

Conversion formulas (reference)

• °F → °C: (°F − 32) × 5/9
• °C → °F: (°C × 9/5) + 32
• K → °C: K − 273.15
• °C → K: °C + 273.15
• °R → °C: (°R − 491.67) × 5/9
• °C → °R: (°C + 273.15) × 9/5
• °Ré → °C: °Ré × 5/4
• °C → °Ré: °C × 4/5

Examples

• 25 °C → 77 °F, 298.15 K (room temperature)
• 0 °C → 32 °F, 273.15 K (freezing point of water)
• 100 °C → 212 °F, 373.15 K (boiling point of water)

Supported Temperature Scales

• Celsius (°C): The most common temperature scale used worldwide. Water freezes at 0°C and boils at 100°C.
• Fahrenheit (°F): Primarily used in the United States. Water freezes at 32°F and boils at 212°F.
• Kelvin (K): The base unit of thermodynamic temperature in the International System of Units (SI). 0K is absolute zero.
• Rankine (°R): An absolute scale related to Fahrenheit, where 0°R is absolute zero.
• Réaumur (°Ré): A historical scale where the freezing and boiling points of water are 0 and 80 degrees, respectively.

FAQ

What is absolute zero?
The theoretical minimum temperature: 0 K = −273.15 °C = −459.67 °F.

Why are my results slightly different from other calculators?
Differences often come from rounding precision. This tool uses standard constants (e.g., 273.15).

Which unit should I use?
Use Kelvin for thermodynamics, Celsius for metric everyday use, and Fahrenheit where customary.

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