Type a number of degrees Celsius and this converter shows the answer in degrees Fahrenheit instantly (25 °C = 77 °F). Below the converter you will find a ready-made °C to °F table, and further down the formula with a worked example.
Celsius is the temperature scale of almost every country, while the United States uses Fahrenheit for weather, ovens and thermostats. You need this conversion to tell an American friend that 30 °C is a hot 86 °F, to set a US oven for a European recipe (180 °C is about 356 °F, usually set to 350 °F), or to read a thermometer that shows 38.5 °C as a fever of 101.3 °F.
How to use the Celsius to Fahrenheit tool
- Enter the value in degrees Celsius in the Value box. Decimals such as 13 are fine.
- The result in degrees Fahrenheit appears straight away, rounded to six significant digits.
- Check the formula line under the result to see exactly how it was calculated.
- Press ⇄ to convert degrees Fahrenheit back to degrees Celsius, or pick any other unit from the lists.
- Use Copy result, or look up common values in the conversion table.
Why use ToolOrca Celsius to Fahrenheit
- Correct offset formula, not a rough factor
- Conversion table: °C to °F
- Formula and worked example included
- Instant result as you type
- Converts to every other temperature unit too
- Free, private and works offline
How to convert degrees Celsius to degrees Fahrenheit
Temperature scales have different zero points, so there is no single factor: On the Celsius scale water freezes at 0 °C and boils at 100 °C at sea level; 0 °C is exactly 273.15 K. On the Fahrenheit scale water freezes at 32 °F and boils at 212 °F, so 180 Fahrenheit degrees span the same range as 100 Celsius degrees.
To convert degrees Celsius to degrees Fahrenheit, multiply the Celsius temperature by 9/5 (or 1.8) and then add 32.
Worked example: 25 °C × 1.8 = 45, then 45 + 32 = 77 °F.
Quick mental math for °C to °F
Double it and add 30: 20 °C → 40 + 30 = 70 °F (exact 68 °F). The shortcut is good for weather between 0 and 30 °C; for cooking temperatures use the exact formula.
Need the opposite direction? Use the degrees Fahrenheit to degrees Celsius converter, or switch units with the ⇄ button above.
Frequently asked questions
How many degrees Fahrenheit is 37 °C?
37 °C is 98.6 °F (37 °C × 1.8 = 66.6, then 66.6 + 32 = 98.6 °F).
How many degrees Fahrenheit is 30 °C?
30 °C is 86 °F (30 °C × 1.8 = 54, then 54 + 32 = 86 °F).
How many degrees Fahrenheit is 180 °C?
180 °C is 356 °F (180 °C × 1.8 = 324, then 324 + 32 = 356 °F).
What is the formula to convert degrees Celsius to degrees Fahrenheit?
To convert degrees Celsius to degrees Fahrenheit, multiply the Celsius temperature by 9/5 (or 1.8) and then add 32. To go the other way, use the degrees Fahrenheit to degrees Celsius converter.
Why is the Celsius to Fahrenheit formula not just a multiplication?
Because the scales start at different points: water freezes at 0 °C but at 32 °F. You multiply by 9/5 for the size of the degrees and add 32 for the offset.