Convert Celsius to Fahrenheit

The Conversion Everyone Needs

Celsius to Fahrenheit is the single most searched temperature conversion on the internet, and for good reason. Almost every country on earth uses Celsius, but the United States, its media, and its weather forecasts still use Fahrenheit. If you travel, cook international recipes, or read American news, you will eventually need this conversion.

Key Reference Points Worth Memorizing

Instead of reaching for a converter every time, anchor these five temperatures in your memory:

• 0°C = 32°F -- Water freezes. Roads get icy. Pipes can burst.
• 20°C = 68°F -- Comfortable room temperature.
• 37°C = 98.6°F -- Normal human body temperature. If a thermometer reads 38°C (100.4°F) or above, that is generally considered a fever in adults. Many parents searching this conversion are doing exactly that check at 2 AM.
• 100°C = 212°F -- Water boils at standard atmospheric pressure (sea level).
• 180°C = 356°F -- A common oven temperature in European recipes, roughly equivalent to the American "350°F" setting.

The Formula and a Faster Shortcut

The exact formula is: °F = (°C x 9/5) + 32

But for quick mental math, there is a simpler approximation: double the Celsius number and add 30. This gets you within a few degrees for the everyday range (0 to 40°C), which is good enough for weather, cooking, and "do I need a jacket?" decisions.

The shortcut drifts further from the true value as numbers get larger, so use the real formula for oven temperatures or scientific work.

Weather: Two Worlds, One Forecast

This is where the cultural gap shows up most. A European hearing "it will be 30 degrees tomorrow" grabs sunscreen. An American hearing the same sentence reaches for a winter coat. Weather is the number one reason people convert between these scales daily, especially when traveling or following international news.

A rough weather guide for Fahrenheit readers:

• 0°C (32°F): Freezing, bundle up
• 10°C (50°F): Cool, jacket weather
• 20°C (68°F): Pleasant, light layers
• 30°C (86°F): Hot, shorts and sunscreen
• 40°C (104°F): Dangerously hot, stay hydrated

Oven Temperature Conversions

International recipes are the other big reason for this conversion. European recipes typically list oven temperatures in Celsius, while American recipes use Fahrenheit. The common settings are 150°C (300°F), 180°C (350°F), 200°C (400°F), and 220°C (425°F). If a recipe says "Gas Mark 4," that is 180°C or 350°F.

For more on how temperature scales were invented and why we ended up with two competing systems, see our history of temperature scales article.