Celsius to Fahrenheit Converter

What is Celsius to Fahrenheit Conversion?

Celsius and Fahrenheit are two different temperature scales. Celsius (also called Centigrade) is used in most countries worldwide and is part of the metric system. Fahrenheitis primarily used in the United States for weather, cooking, and everyday temperature measurements.

The Conversion Formula

Or equivalently:

Understanding the Formula

• Multiply by 9/5 (or 1.8): This scales the Celsius degree size to match Fahrenheit
• Add 32: This adjusts for the different zero points (0°C = 32°F)

Quick Mental Math Tricks

• Double and add 30: For a quick estimate, double the Celsius and add 30 (e.g., 20°C ≈ 70°F, actual: 68°F)
• At -40°: Celsius equals Fahrenheit (-40°C = -40°F) - the only point where they're equal

Common Conversions

• 0°C = 32°F – Water freezes
• 20°C = 68°F – Comfortable room temperature
• 37°C = 98.6°F – Normal human body temperature
• 100°C = 212°F – Water boils (at sea level)

Why Two Different Scales?

Daniel Gabriel Fahrenheit created his scale in 1724, using 0° as the coldest temperature he could achieve with ice and salt, and 96° as human body temperature. Anders Celsius created a simpler scale in 1742, based on water's freezing (0°) and boiling (100°) points, which became the international standard.