Convert temperatures from Celsius to Fahrenheit instantly — also supports Kelvin.
Last updated: July 2026
Convert Celsius to Fahrenheit (°C to °F)
Whether you are checking the weather for an upcoming trip, following an international baking recipe, or converting a lab result, converting Celsius to Fahrenheit is a daily necessity for anyone splitting time between metric and US customary units. Our calculator gives you the exact temperature instantly, and also converts to and from Kelvin if you need it for scientific work.
The Formula, Explained Simply
To convert Celsius to Fahrenheit, multiply the Celsius value by 9/5 (or 1.8), then add 32:
°F = (°C × 9/5) + 32
The extra 32 exists because the two scales don't start at the same zero point — 0°C (freezing) lines up with 32°F, not 0°F. The 9/5 factor accounts for the fact that Fahrenheit divides the same temperature range into more, smaller degrees.
A Worked Example
Say you want to convert a summer day of 28°C to Fahrenheit:
28 × 9/5 = 50.4
50.4 + 32 = 82.4°F
And for a common recipe temperature of 200°C:
200 × 9/5 = 360
360 + 32 = 392°F
Note that US recipe conversion charts often round oven temperatures to the nearest common setting (e.g., listing 200°C as "400°F"), so if a recipe's numbers look slightly off from an exact conversion, that's usually why — check your recipe source's convention if precision matters.
The Freezing and Boiling Points
In the Celsius system, water freezes at 0° and boils at 100°. This makes logical sense. In the Fahrenheit system, water freezes at 32° and boils at 212°. Because they don't scale at the exact same rate, converting in your head is difficult — our tool handles the math instantly, in either direction. Need to go the other way? Try our Fahrenheit to Celsius converter.
Frequently Asked Questions
The formula is: (°C × 9/5) + 32 = °F. For example, 20°C × 9/5 = 36. Then add 32 to get 68°F. You can also multiply by 1.8 instead of 9/5 — they give the same result.
0°C, the freezing point of water, is equal to exactly 32°F.
100°C, the boiling point of water at sea level, is equal to exactly 212°F.
Yes — at -40 degrees, the two scales meet: -40°C is exactly -40°F. This is the only point where the two scales show the same number.
Normal human body temperature, commonly cited as 37°C, converts to 98.6°F. A fever is generally considered to start around 38°C (100.4°F), though guidance on exact thresholds can vary — check with a healthcare provider for anything medically significant.
For a rough estimate, double the Celsius figure and add 30 (instead of the exact 1.8 multiplier and 32). It's close enough for everyday things like checking the weather, though not precise enough for cooking or science.
Yes. Use the unit dropdowns above to convert between Celsius, Fahrenheit, and Kelvin in any direction — not just Celsius to Fahrenheit.
Fahrenheit was the standard across English-speaking countries until the mid-20th century, when most nations shifted to Celsius as part of broader metrication. The US, along with a small number of other countries, never made the switch, so Fahrenheit is still what's used in everyday American life, weather reports, and home appliances.