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Fahrenheit
Convert between Celsius, Fahrenheit, Kelvin and Rankine instantly.
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Temperature scales include Celsius, Fahrenheit, Kelvin and Rankine. Key formulas: F = C*9/5+32, K = C+273.15
Temperature conversion is unusual because the scales do not share a zero point. A 10-degree increment is not the same in Celsius and Fahrenheit, so you cannot just multiply by a single conversion factor. Our converter applies the correct linear formulas behind the scenes so you get the right answer every time.
Celsius (°C) anchors at the melting and boiling points of water (0 and 100 at standard pressure). Fahrenheit (°F) sets water freezing at 32 and boiling at 212. Kelvin (K) is the absolute SI scale: 0 K is absolute zero (-273.15 °C). Rankine (°R) is Kelvin scaled to Fahrenheit-sized degrees and is used in some thermodynamics texts in the United States.
To convert Celsius to Fahrenheit: F = C × 9/5 + 32. To convert Fahrenheit to Celsius: C = (F - 32) × 5/9. To convert Celsius to Kelvin add 273.15. To convert Kelvin to Rankine multiply by 9/5. The tool does all four of these automatically.
Oven temperatures: 180 °C equals 356 °F (often rounded to "350 F"). Body temperature: a healthy 37 °C is 98.6 °F. A summer day at 30 °C is 86 °F. A winter day at -10 °C is 14 °F. Memorising one or two of these makes mental conversion much easier.
Absolute zero is 0 K, equal to -273.15 °C or -459.67 °F. It is the theoretical lower limit of temperature where particle motion is minimized.
Fahrenheit remains the standard for weather and cooking in the United States and a few other places mostly for historical and cultural reasons. The smaller degree size also gives slightly more precision without decimals for everyday weather.
Yes — you can type a negative number such as -40 (which famously equals -40 in both Celsius and Fahrenheit).
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