Temperature Converter

Temperature is one of the most fundamental physical quantities, and different scales are used around the world. Understanding how to convert between them is essential for science, cooking, weather, medicine, and engineering.

Celsius (°C) is the most widely used scale globally, based on the freezing point (0°C) and boiling point (100°C) of water at standard pressure. Fahrenheit (°F) is used primarily in the United States; water freezes at 32°F and boils at 212°F.

Kelvin (K) is the SI base unit for temperature — an absolute scale where 0 K is absolute zero (the coldest theoretically possible temperature). Celsius and Kelvin use the same size degree; the difference is just the zero point: K = °C + 273.15.

Rankine (°R) is another absolute scale, but it uses Fahrenheit-sized degrees. It is used in some engineering applications in the US. The relationships: °R = °F + 459.67 = K × 9/5. Temperature conversion is non-linear between scales, unlike most unit conversions.

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