Celsius to Fahrenheit: Formula, Conversion Table & Quick Reference

Celsius and Fahrenheit are the two most common temperature scales in everyday use. While most of the world uses Celsius, the United States, Belize, and Cayman Islands use Fahrenheit — meaning conversions come up constantly in cooking, weather, and travel.

The Exact Formula

°F = (°C × 9/5) + 32 °C = (°F − 32) × 5/9

Quick Mental Trick

For a fast estimate (not exact): double the Celsius temperature and add 30. 25°C → (25 × 2) + 30 = 80°F (actual is 77°F — close enough for everyday use).

Common Temperature Reference Points

• 0°C / 32°F — Water freezing point
• 20°C / 68°F — Comfortable room temperature
• 37°C / 98.6°F — Normal body temperature
• 100°C / 212°F — Water boiling point (at sea level)
• -40°C / -40°F — The only point where both scales agree
• 180°C / 356°F — Common baking temperature
• 200°C / 392°F — Medium-high oven for roasting

Weather Temperature Guide

• Below 0°C / 32°F — Freezing, ice possible
• 10–15°C / 50–59°F — Cool, jacket needed
• 20–25°C / 68–77°F — Comfortable, pleasant
• 30–35°C / 86–95°F — Hot, stay hydrated
• Above 40°C / 104°F — Extreme heat, dangerous

Convert temperatures instantly with our Temperature Converter.