Converting Celsius to Fahrenheit doesn’t have to be confusing. Here’s the easy version:
The formula
°F = (°C × 9/5) + 32
A quick rule of thumb (for everyday use)
Double the °C number.
Add 30.
This gives a close estimate. Example: 20 °C → about 70 °F (exact is 68 °F).
Step-by-step example
Convert 25 °C to Fahrenheit.
25 × 9/5 = 45
45 + 32 = 77 °F
Common checkpoints
0 °C = 32 °F (freezing)
20 °C ≈ 68 °F (room temp)
30 °C ≈ 86 °F (warm day)
Make it instant
Use our fast Temperature Converter—type the number and switch between °C and °F in one tap: /temperature-converter