Celsius ↔ Fahrenheit
Convert between Celsius (°C) and Fahrenheit (°F) instantly. Type in either field for an immediate, real-time conversion.
Formula: °F = (°C × 9/5) + 32. Enter any value to update the other field automatically.
Technical Overview
Temperature Math
Unlike length or weight, temperature scales do not start at zero. Therefore, we use an offset (+32) and a ratio (1.8 or 9/5) to convert between them:
°F = (°C × 1.8) + 32
°C = (°F - 32) ÷ 1.8
Interesting Facts
The Celsius scale is centered around the properties of water at sea level. The Fahrenheit scale was originally based on the temperature of a salt-ice brine (0°F) and human body temperature (initially set to 96°F).
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Frequently Asked Questions
How do I convert Celsius to Fahrenheit?
To convert Celsius to Fahrenheit, multiply the Celsius temperature by 9/5 and then add 32. For example, 20°C equals 68°F because (20 × 9/5) + 32 = 68. Our calculator automates this instantly.
What is the formula for converting Fahrenheit to Celsius?
To convert Fahrenheit to Celsius, subtract 32 from the Fahrenheit temperature and then multiply by 5/9. For example, 68°F equals 20°C because (68 - 32) × 5/9 = 20.
Why do we use Celsius and Fahrenheit scales?
Celsius is used globally as part of the metric system (0°C freezing, 100°C boiling). Fahrenheit is common in the US (32°F freezing, 212°F boiling). This tool helps you switch between them for weather, cooking, or science.