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Temperature Converter

Temperature conversion uses three formulas: °C = (°F - 32) × 5/9 for Fahrenheit to Celsius, °F = °C × 9/5 + 32 for Celsius to Fahrenheit, and K = °C + 273.15 for Celsius to Kelvin. Enter a temperature in any unit to convert to the other two scales instantly.

Quick Answer

72°F equals 22.22°C and 295.37 K. Water freezes at 32°F / 0°C / 273.15 K and boils at 212°F / 100°C / 373.15 K.

Common Examples

Input Result
72°F 22.22°C / 295.37 K
100°C 212°F / 373.15 K
0°C 32°F / 273.15 K
300 K 26.85°C / 80.33°F

How It Works

Fahrenheit to Celsius: °C = (°F - 32) x 5/9

Celsius to Fahrenheit: °F = (°C x 9/5) + 32

Celsius to Kelvin: K = °C + 273.15

Kelvin to Celsius: °C = K - 273.15

Fahrenheit to Kelvin: Convert to Celsius first, then add 273.15.

Key reference points: Water freezes at 32°F / 0°C / 273.15K. Water boils at 212°F / 100°C / 373.15K. Absolute zero is -459.67°F / -273.15°C / 0K.

Worked Example

To convert 72°F to Celsius: °C = (72 - 32) × 5/9 = 40 × 5/9 = 200/9 ≈ 22.22°C. Then to Kelvin: K = 22.22 + 273.15 = 295.37 K. Going the other direction, to convert 25°C to Fahrenheit: °F = 25 × 9/5 + 32 = 45 + 32 = 77°F.

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Frequently Asked Questions

What is absolute zero?
Absolute zero is 0 Kelvin (-273.15°C or -459.67°F). It is the theoretical lowest possible temperature where all molecular motion ceases. The calculator will not produce negative Kelvin values.
Which countries use Fahrenheit?
The United States, its territories, and a few other countries (Bahamas, Cayman Islands, Liberia, Palau) primarily use Fahrenheit. Most of the world uses Celsius.
At what temperature are Fahrenheit and Celsius equal?
Fahrenheit and Celsius are equal at -40 degrees. That is, -40°F = -40°C.

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