Temperature Converter — Free Online Tool
Enter a temperature in any scale — Celsius, Fahrenheit, Kelvin, or Rankine — and all other scales update instantly. Includes preset buttons for body temperature, boiling point, and absolute zero. An error banner fires for physically impossible values below absolute zero.
100% client-side. No uploads. Your data never leaves your browser.
How to use Temperature Converter
- Click any temperature field and type a value.
- All other fields update instantly.
- Use presets — Body Temp, Boiling, Absolute Zero.
- Copy any result with its Copy button.
Frequently Asked Questions
How are temperatures converted?
All conversions route through Kelvin as the absolute reference. Celsius = K − 273.15. Fahrenheit = (K × 9/5) − 459.67. Rankine = K × 9/5.
What is absolute zero?
Absolute zero (0 K, −273.15°C, −459.67°F) is the coldest physically possible temperature. The tool rejects values below it.
What are common reference temperatures?
Water freezes at 0°C / 32°F / 273.15 K. Body temp is 37°C / 98.6°F. Water boils at 100°C / 212°F.
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