Temperature Unit Converter
Professional temperature unit converter supporting fast conversion between Celsius, Fahrenheit, Kelvin, Rankine and more.
Common temperature units
Other temperature units
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How to use the Temperature Unit Converter
This tool converts between Celsius (°C), Fahrenheit (°F), Kelvin (K), Rankine (°R) and several historical temperature scales. All conversions run entirely in your browser; no data is uploaded, making it safe for experimental data, engineering parameters and everyday temperature conversions.
- Type a value into any temperature unit input (decimals and negative values are supported). The value is interpreted as a temperature in that scale.
- Once you finish input, all other temperature unit inputs will be updated with the corresponding converted values, making it easy to compare numbers across different scales.
- Supported common units include Celsius (°C), Fahrenheit (°F) and Kelvin (K). Other units include Rankine, Réaumur, Delisle, Newton and Rømer scales.
- Kelvin and Rankine are absolute temperature scales using absolute zero as their origin, which makes them especially suitable for thermodynamics and scientific calculations.
- Results are formatted with an appropriate number of decimal places based on magnitude to balance precision and readability.
FAQ
What are the basic conversion formulas between Celsius, Fahrenheit and Kelvin?
The basic formulas are: °F = °C × 9/5 + 32; K = °C + 273.15; °R = (°C + 273.15) × 9/5. These are used internally by the converter to ensure consistent results across all units.
Why are negative values allowed for some temperature units?
Different scales define their zero point differently. For example, 0°C is the freezing point of water, but corresponds to 273.15K on the Kelvin scale. In both scientific and everyday contexts, sub-zero temperatures are common, so the converter allows negative values.
What is absolute zero in different temperature scales?
Absolute zero is -273.15°C ≈ -459.67°F = 0K ≈ 0°R. It is the theoretical lower limit of temperature where molecular motion approaches a minimum.
Which temperature scale should I prefer for scientific calculations?
In thermodynamics and physics, absolute scales like Kelvin (K) or Rankine (°R) are typically preferred because they start at absolute zero and maintain linear relationships in equations. In engineering and daily use, Celsius and Fahrenheit remain the most common.