Temperature Converter

Convert between Celsius, Fahrenheit and Kelvin instantly. Edit any field and all three update in real time.

Temperature Converter — Edit any field
°C
CELSIUS
°F
FAHRENHEIT
K
KELVIN

Edit any field — the others update instantly

Reference temperatures
Reference point°C°FK
Water freezing point032273.15
Water boiling point100212373.15
Normal human body temp.3798.6310.15
Room temperature (comfort)2271.6295.15
Absolute zero−273.15−459.670
Summer heat (extreme)40104313.15
Winter cold (extreme)−20−4253.15

Temperature conversion formulas

Celsius to Fahrenheit

°F = (°C × 9/5) + 32  ·  Example: 100°C = (100 × 9/5) + 32 = 212°F

Fahrenheit to Celsius

°C = (°F − 32) × 5/9  ·  Example: 98.6°F = (98.6 − 32) × 5/9 = 37°C

Celsius to Kelvin

K = °C + 273.15  ·  Example: 0°C = 273.15 K

Fahrenheit to Kelvin

K = (°F + 459.67) × 5/9  ·  Example: 32°F = 273.15 K

FAQ — Temperature Converter

What is the difference between Celsius and Fahrenheit?

Celsius is used in most countries (metric system). Fahrenheit is used primarily in the United States. Water freezes at 0°C / 32°F and boils at 100°C / 212°F.

What is Kelvin used for?

Kelvin is the SI unit for temperature used in science. It starts at absolute zero (−273.15°C), the coldest possible temperature.

How do I quickly convert Celsius to Fahrenheit in my head?

A quick approximation: multiply °C by 2 and add 30. Example: 20°C × 2 + 30 = 70°F (actual: 68°F). Good for rough estimates.

Step-by-step guide How to Convert Temperature Between Units — Guide →