Temperature Converter
Three temperature scales are in common use. Celsius (°C) is the international standard for everyday use, where water freezes at 0°C and boils at 100°C at standard pressure. Fahrenheit (°F) is used primarily in the United States, where water freezes at 32°F and boils at 212°F. Kelvin (K) is the SI base unit of temperature, used in scientific contexts — it starts at absolute zero (0 K = −273.15°C), the lowest theoretically possible temperature.
The Celsius and Kelvin scales have identical degree intervals, so a temperature difference of 1°C equals a difference of 1 K. Fahrenheit degrees are smaller: a change of 1°C equals a change of 1.8°F.
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Frequently Asked Questions
How do I convert Fahrenheit to Celsius?
To convert Fahrenheit to Celsius, subtract 32, then multiply by 5/9. Formula: °C = (°F − 32) × 5/9. For example, 98.6°F = (98.6 − 32) × 5/9 = 37°C. To go the other way: °F = (°C × 9/5) + 32.
How do you convert Celsius to Kelvin?
To convert Celsius to Kelvin, add 273.15. Formula: K = °C + 273.15. For example, 0°C = 273.15 K and 100°C = 373.15 K. The Kelvin and Celsius scales have identical degree intervals — Kelvin starts at absolute zero rather than the freezing point of water.
What is absolute zero in Celsius and Fahrenheit?
Absolute zero is −273.15°C or −459.67°F. It is the theoretical lowest possible temperature, at which atoms have minimum thermal motion. On the Kelvin scale, absolute zero is 0 K — the starting point of the scale.
What temperature is the same in Celsius and Fahrenheit?
−40 degrees is the point where the Celsius and Fahrenheit scales meet: −40°C = −40°F. This is because the two scales have different zero points but converge at this value.