Temperature Converter
Convert between Celsius, Fahrenheit, Kelvin, and Rankine instantly.
Did this tool work for you?
How to use this calculator
- 1
Enter the temperature value in the "From" field.
- 2
Select the scale you are converting from (e.g. Celsius).
- 3
Select the scale you want to convert to (e.g. Fahrenheit).
- 4
The result appears instantly. Both fields are editable — you can type in either.
Frequently asked questions
How do I convert Celsius to Fahrenheit?
Use the formula: °F = (°C × 9/5) + 32. For example, 100°C = (100 × 1.8) + 32 = 212°F.
How do I convert Fahrenheit to Celsius?
Use the formula: °C = (°F − 32) × 5/9. For example, 98.6°F = (98.6 − 32) × 5/9 = 37°C.
What is absolute zero in Celsius and Fahrenheit?
Absolute zero is 0 Kelvin, which equals −273.15°C or −459.67°F. It is the theoretical lowest possible temperature.
What is the difference between Kelvin and Celsius?
The Kelvin and Celsius scales use the same size degree, but Kelvin starts at absolute zero while Celsius starts at the freezing point of water. To convert: K = °C + 273.15.
At what temperature are Celsius and Fahrenheit equal?
Celsius and Fahrenheit are equal at −40°. Both scales read −40 at this point.
Temperature scales and conversions
The three main temperature scales
Celsius (°C) is used in most of the world for everyday temperature. Fahrenheit (°F) is the standard in the United States. Kelvin (K) is used in science and is the SI base unit of temperature — it has no degree symbol and starts at absolute zero.
Conversion formulas
Celsius to Fahrenheit: (°C × 9/5) + 32. Fahrenheit to Celsius: (°F − 32) × 5/9. Celsius to Kelvin: °C + 273.15. Kelvin to Celsius: K − 273.15. Fahrenheit to Kelvin: (°F − 32) × 5/9 + 273.15.
Common reference temperatures
Water freezes at 0°C / 32°F / 273.15 K. Water boils at 100°C / 212°F / 373.15 K. Normal body temperature is 37°C / 98.6°F. Room temperature is typically 20–22°C / 68–72°F. Absolute zero is −273.15°C / −459.67°F / 0 K.
Temperature: how it works
Unit conversion matters across engineering, science, cooking, and everyday life. This tool applies internationally recognised conversion factors to deliver precise, instant results across all major unit systems — no manual lookup needed.
Who uses this tool?
Scientists, engineers, chefs, and international travellers use this tool daily to bridge the gap between different measurement systems. It eliminates the need to memorise conversion factors or hunt through reference tables.
Learn more from an authoritative source:
NISTLength Converter
Convert between metres, kilometres, feet, inches, miles, yards, and more length units instantly.
Inches to Feet Converter
Convert inches to feet instantly. See the result in feet and inches combined (e.g. 5'4"), decimal feet, and centimetres.
Weight & Mass Converter
Convert between kilograms, pounds, ounces, grams, stones, tonnes, and more weight units.
Volume Converter
Convert between litres, millilitres, gallons, cups, fluid ounces, cubic metres, and more.
Results are estimates for informational purposes only and do not constitute professional financial, medical, legal, or technical advice. Read full disclaimer →