Celsius to Fahrenheit Converter
Convert temperatures between Celsius, Fahrenheit, and Kelvin with formula explanation. Enter values for instant results with step-by-step formulas.
Formula
F = (C x 9/5) + 32 | C = (F - 32) x 5/9 | K = C + 273.15
The Celsius and Fahrenheit scales have different zero points and degree sizes. Fahrenheit has 180 degrees between water's freezing (32 degrees F) and boiling (212 degrees F) points, while Celsius has 100 degrees (0 degrees C to 100 degrees C). The ratio 9/5 (or 1.8) converts the degree size, and adding/subtracting 32 accounts for the offset. Kelvin starts at absolute zero and uses the same degree size as Celsius.
Worked Examples
Example 1: Cooking Temperature Conversion
Problem: Convert an oven temperature of 350 degrees F to Celsius for a European recipe.
Solution: C = (F - 32) x 5/9\nC = (350 - 32) x 5/9\nC = 318 x 5/9\nC = 176.67 degrees C\nRound to nearest 5: approximately 175 degrees C (Gas Mark 4)
Result: 350 degrees F = 176.67 degrees C = 449.82 K
Example 2: Weather Temperature
Problem: The forecast says 28 degrees C. What is that in Fahrenheit?
Solution: F = (C x 9/5) + 32\nF = (28 x 9/5) + 32\nF = (28 x 1.8) + 32\nF = 50.4 + 32\nF = 82.4 degrees F\nThis is a warm summer day.
Result: 28 degrees C = 82.4 degrees F = 301.15 K
Frequently Asked Questions
How do I convert Fahrenheit to Celsius?
To convert Fahrenheit to Celsius, subtract 32 from the Fahrenheit temperature and then multiply by 5/9 (or divide by 1.8). The formula is: C = (F - 32) x 5/9. For example, to convert 72 degrees Fahrenheit: 72 - 32 = 40, then 40 x 5/9 = 22.22 degrees Celsius. A quick estimation trick: subtract 30 and divide by 2 (72 - 30 = 42, 42/2 = 21, close to the actual 22.22).
At what temperature are Celsius and Fahrenheit equal?
Celsius and Fahrenheit scales intersect at exactly -40 degrees. At this temperature, -40 degrees C equals -40 degrees F. You can verify: (-40 x 9/5) + 32 = -72 + 32 = -40 degrees F. This is also a useful fact for double-checking conversion formulas. Above -40, Fahrenheit values are always higher than Celsius values for the same temperature. Below -40, Fahrenheit values are lower.
Why does the US use Fahrenheit while most countries use Celsius?
The Fahrenheit scale was developed by Daniel Gabriel Fahrenheit in 1724 and was widely adopted in English-speaking countries. The Celsius scale (originally called centigrade) was developed by Anders Celsius in 1742 with the more intuitive 0-100 range between water's freezing and boiling points. Most countries adopted Celsius during metrication in the 1960s-70s. The US, along with a few territories, retained Fahrenheit for everyday use due to cultural familiarity and the cost of conversion, though Celsius is used in US scientific contexts.
How do I convert between Celsius, Fahrenheit, and Kelvin?
Celsius to Fahrenheit: multiply by 9/5 and add 32. Fahrenheit to Celsius: subtract 32 and multiply by 5/9. Celsius to Kelvin: add 273.15. Key reference points: water freezes at 0C/32F/273.15K and boils at 100C/212F/373.15K.
What formula does Celsius to Fahrenheit Converter use?
The formula used is described in the Formula section on this page. It is based on widely accepted standards in the relevant field. If you need a specific reference or citation, the References section provides links to authoritative sources.
Can I use the results for professional or academic purposes?
You may use the results for reference and educational purposes. For professional reports, academic papers, or critical decisions, we recommend verifying outputs against peer-reviewed sources or consulting a qualified expert in the relevant field.