Skip to main content
Kalcufy

Celsius to Fahrenheit Converter

How to Convert Celsius to Fahrenheit

To convert Celsius to Fahrenheit, multiply by 9/5 (or 1.8) and add 32. The formula is: °F = (°C × 9/5) + 32. The Celsius scale (also called centigrade) was devised by Anders Celsius in 1742 and sets water's freezing point at 0° and boiling point at 100° at standard pressure. The Fahrenheit scale, created by Daniel Fahrenheit in 1724, sets water's freezing at 32° and boiling at 212°. Most of the world uses Celsius, while the US is the only major country using Fahrenheit for daily weather and cooking.

The °C to °F Formula Explained

The exact formula is: °F = (°C × 1.8) + 32. The factor 1.8 (or 9/5) accounts for the different scale sizes: Fahrenheit has 180 degrees between freezing and boiling (32 to 212), while Celsius has 100 degrees (0 to 100). So each Celsius degree = 1.8 Fahrenheit degrees. The +32 shifts the scale since freezing is at 32°F. For quick mental math: double the Celsius value and add 30. Example: 25°C → (25 × 2) + 30 = 80°F (actual: 77°F — close enough for weather).

Frequently Asked Questions

What is the formula for Celsius to Fahrenheit?

°F = (°C × 9/5) + 32, or equivalently °F = (°C × 1.8) + 32. Multiply the Celsius temperature by 1.8, then add 32 to get Fahrenheit.

What is 0°C in Fahrenheit?

0°C = 32°F. This is the freezing point of water at standard atmospheric pressure. It's one of the two key anchor points for temperature conversion.

What is normal body temperature in Fahrenheit?

Normal body temperature is 37°C = 98.6°F. A fever is generally considered 38°C (100.4°F) or higher. However, normal body temperature can range from 36.1°C to 37.2°C (97°F to 99°F).

How do I quickly estimate °C to °F?

Double the Celsius value and add 30. Example: 25°C → 50 + 30 = 80°F (actual: 77°F). This method works well for weather temperatures (0-40°C) with about ±3°F accuracy.

At what temperature are Celsius and Fahrenheit equal?

-40 degrees is the only temperature that is the same on both scales: -40°C = -40°F. You can verify: (-40 × 1.8) + 32 = -72 + 32 = -40.

What is 180°C in Fahrenheit for baking?

180°C = 356°F, which is the most common baking temperature (often called "moderate oven" or Gas Mark 4). Most cakes, cookies, and casseroles bake at this temperature.