🔄 Unit Converters
Temperature Converter
Convert between Celsius, Fahrenheit and Kelvin. Type in any field and all others update instantly.
Celsius
°C
Fahrenheit
°F
Kelvin
K
Enter a temperature above to see the formula…
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Free Online Temperature Converter
Our free temperature converter instantly converts between all major temperature scales — Celsius, Fahrenheit, Kelvin and Rankine. Type a value in any field and all other units update simultaneously in real time, so you can see all conversions at once without switching between inputs.
Whether you're converting oven temperatures for a recipe, understanding weather forecasts while travelling, doing scientific calculations, or working with industrial temperature readings, this tool covers all common use cases quickly and accurately.
🌡 4 Temperature Scales
Celsius, Fahrenheit, Kelvin and Rankine — all updated simultaneously.
⚡ Real-time Conversion
Type in any field and all others update instantly.
🎯 High Precision
Results shown to 4 decimal places for scientific accuracy.
📱 Mobile Friendly
Works perfectly on all devices — no app download needed.
Common Temperature Conversions
- Body temperature: 37°C = 98.6°F = 310.15 K
- Water boiling point: 100°C = 212°F = 373.15 K
- Water freezing point: 0°C = 32°F = 273.15 K
- Absolute zero: -273.15°C = -459.67°F = 0 K
- Oven — moderate: 180°C = 356°F
- Room temperature: 20–22°C = 68–72°F
- Comfortable hot day: 30°C = 86°F
Temperature Conversion Formulas
- Celsius to Fahrenheit: (°C × 9/5) + 32
- Fahrenheit to Celsius: (°F − 32) × 5/9
- Celsius to Kelvin: °C + 273.15
- Kelvin to Celsius: K − 273.15
Frequently Asked Questions
What is the difference between Celsius and Fahrenheit?
Celsius (°C) is the standard temperature scale used in most of the world — the metric system. Water freezes at 0°C and boils at 100°C. Fahrenheit (°F) is used primarily in the United States. Water freezes at 32°F and boils at 212°F. The two scales meet at -40° (where -40°C = -40°F).
What is Kelvin and when is it used?
Kelvin (K) is the SI base unit of temperature used in science and engineering. It starts at absolute zero — the coldest theoretically possible temperature — and has no negative values. 0 Kelvin = -273.15°C. It's used in thermodynamics, astrophysics, chemistry and physics. Notice that Kelvin doesn't use the degree symbol (°).
What is the fastest way to roughly convert Celsius to Fahrenheit in your head?
A quick mental trick is to double the Celsius temperature and add 30. For example, 20°C × 2 = 40, + 30 = 70°F (the exact answer is 68°F). This isn't perfectly accurate but is good enough for quick everyday estimates when you're travelling or cooking.
Why does the UK use both Celsius and Fahrenheit?
The UK officially switched to Celsius for most purposes, but Fahrenheit is still commonly used informally — especially for body temperature, outdoor weather by older generations, and cooking. Many Brits think of hot summer days in Fahrenheit (90°F sounds hotter than 32°C feels) while using Celsius for everyday purposes.
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