Celsius to Fahrenheit: The Complete Conversion Guide

Temperature conversion is one of the most common calculations people need in everyday life — reading a weather forecast, following a recipe, or understanding a fever. Here's everything you need to convert between Celsius and Fahrenheit confidently.

The Formula

°F = (°C × 9/5) + 32. To go the other direction: °C = (°F − 32) × 5/9. These are exact, by definition — there's no rounding involved in the conversion itself.

Worked Examples

• 0°C (freezing point of water) = 32°F
• 20°C (comfortable room temperature) = 68°F
• 37°C (normal body temperature) = 98.6°F
• 100°C (boiling point of water) = 212°F
• −40°C = −40°F (the one temperature where both scales agree)

Quick Mental Math Shortcut

For a rough estimate, double the Celsius temperature and add 30. This gives you an approximate Fahrenheit value fast. Example: 22°C → (22 × 2) + 30 = 74°F (actual answer: 71.6°F). Good enough for checking the weather.

When You'll Use This

• Weather forecasts: most of the world uses Celsius; the US uses Fahrenheit
• Cooking: oven temperatures differ between recipe origins
• Medicine: body temperature is reported in different units depending on the country
• Science: Celsius and Kelvin are standard in scientific work