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Temperature Converter
Convert between Celsius, Fahrenheit, Kelvin, Rankine, and Réaumur with instant results and formula display.
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Conversion Formulas
C to F: °C × 9/5 + 32 = °F
F to C: (°F - 32) × 5/9 = °C
C to K: °C + 273.15 = K
K to C: K - 273.15 = °C
C to Ré: °C × 4/5 = °Ré
Ré to C: °Ré × 5/4 = °C
C to °R: (°C + 273.15) × 9/5 = °R
°R to C: (°R - 491.67) × 5/9 = °C
What is Temperature Conversion?
Temperature conversion allows you to convert between different temperature scales. The most common scales are Celsius (°C), Fahrenheit (°F), and Kelvin (K), but this tool also supports Rankine (°R) and Réaumur (°Ré).
This tool features:
- Five temperature scales — Celsius, Fahrenheit, Kelvin, Rankine, and Réaumur.
- Instant conversion — Results update in real-time as you type.
- Formula display — See the conversion formula used for each calculation.
- Bidirectional — Enter any value and all others update automatically.
How to Use
- Enter a temperature — Type a value in any of the five temperature fields.
- View converted values — All other fields update automatically with the converted values.
- Check the formula — The formula section shows the conversion formula used.
Frequently Asked Questions
How do I convert Celsius to Fahrenheit?
Multiply the Celsius value by 9/5 and add 32. For example, 100°C × 9/5 + 32 = 212°F.
What is the difference between Kelvin and Rankine?
Both are absolute temperature scales. Kelvin uses the same increment as Celsius, while Rankine uses the same increment as Fahrenheit. Absolute zero is 0 K or 0 °R.
What is the Réaumur scale used for?
The Réaumur scale is primarily used in some European food industry applications and in the production of certain dairy products. Water freezes at 0°Ré and boils at 80°Ré.
Is this tool free to use?
Yes. All processing happens entirely in your browser. No data is sent to any server.
Last updated: 30 Jun 2026
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