Temperature Converter

Temperature Converter – Celsius, Fahrenheit, Kelvin, Rankine, Reaumur

Easily convert between all major temperature units (Celsius, Fahrenheit, Kelvin, Rankine, Reaumur) with this free online tool. Enter your value, select units, and get instant, accurate results with calculation steps and a handy conversion table.

How to Convert Temperature Units

To convert between temperature units, use these formulas:
°F = (°C × 9/5) + 32
K = °C + 273.15
°R = °F + 459.67
°r = °C × 4/5

Examples

• 0°C = 32°F = 273.15K = 491.67°R = 0°r (Freezing point of water)
• 100°C = 212°F = 373.15K = 671.67°R = 80°r (Boiling point of water)
• -40°C = -40°F = 233.15K = 419.67°R = -32°r (Where Celsius and Fahrenheit meet)
• 0K = -273.15°C = -459.67°F = 0°R = -218.52°r (Absolute zero)
• 37°C = 98.6°F = 310.15K = 558.27°R = 29.6°r (Human body temperature)

Common Temperature Units

Celsius (°C), Fahrenheit (°F), Kelvin (K), Rankine (°R), and Reaumur (°r) are the most common temperature units used in science, engineering, and daily life. Celsius is used in most countries, Fahrenheit is used in the US, Kelvin is used in scientific work, Rankine is used in engineering, and Reaumur is used in some European countries.