Celsius to Fahrenheit: Quick Conversion Guide

Americans use Fahrenheit. The rest of the world uses Celsius. If you travel, cook international recipes, or read non-US weather forecasts, you need to convert.

Quick Reference

• 0C = 32F (water freezes)
• 10C = 50F (cool day, jacket weather)
• 20C = 68F (comfortable room temperature)
• 30C = 86F (hot summer day)
• 37C = 98.6F (body temperature)
• 100C = 212F (water boils)

The Formula

F = (C x 9/5) + 32

C = (F - 32) x 5/9

Or skip the math: the Temperature Converter does it instantly for any value.

Quick Mental Math Trick

For a rough estimate: double the Celsius number and add 30.

25C: double = 50, add 30 = 80F. (Actual: 77F. Close enough for weather.)

This trick works well in the 0-30C range. It breaks down at extremes but it's handy for everyday use.