Celsius to Fahrenheit converter
Celsius to Fahrenheit in one step: 100 °C = 212 °F. Type a temperature in °C and the °F value appears while you type – or type in °F to go back. Below you find the formula with the working, a mental shortcut for weather and a chart of common values.
Example: Temperature 100 · Direction: Celsius to Fahrenheit (°C → °F) → Answer: 100 °C = 212 °F. Source: NIST SP 811, Appendix B.8 – degree Celsius, degree Fahrenheit, kelvin: temperature: t(°F) = t(°C) × 9/5 + 32; T(K) = t(°C) + 273.15. Updated: .
How it is calculated
The formula: °F = °C × 9/5 + 32
To convert Celsius to Fahrenheit, multiply by 1.8 (that is 9/5) and add 32. °F = °C × 1.8 + 32. For 100 °C: 100 × 1.8 = 180, and 180 + 32 = 212 °F. For 37 °C: 37 × 1.8 = 66.6, plus 32 gives 98.6 °F.
Going back, subtract 32 first and then multiply by 5/9: °C = (°F − 32) × 5 ÷ 9. For 350 °F: (350 − 32) × 5 ÷ 9 = 176.67 °C. The factor 1.8 exists because the Celsius scale spans 100 degrees between freezing and boiling water, the Fahrenheit scale 180 degrees (32 °F to 212 °F). The +32 is the offset, because 0 °C is already 32 °F.
A shortcut for weather: double it and add 30
For a quick estimate, double the Celsius value and add 30. 20 °C gives 20 × 2 + 30 = 70 °F, against 68 °F exact. At 10 °C it says 50 °F, which is exactly right, and at 30 °C it says 90 °F against 86 °F. The error grows by 0.2 °F for every degree above 10 °C, so keep this trick to the range of ordinary weather. For hot ovens or fever, use the exact formula (the converter above does this).
Celsius to Fahrenheit chart
The chart in the results lists −40 to 250 °C. Values you meet most often: 0 °C = 32 °F, 10 °C = 50 °F, 15 °C = 59 °F, 20 °C = 68 °F, 25 °C = 77 °F, 30 °C = 86 °F, 35 °C = 95 °F, 40 °C = 104 °F. In the kitchen: 180 °C = 356 °F and 200 °C = 392 °F, 220 °C = 428 °F. US recipes usually say 350 °F, which is 176.67 °C – so setting a Celsius oven to 180 °C is the usual match.
Two points worth remembering
−40 is the one temperature that reads the same on both scales: −40 °C = −40 °F. And the lowest temperature that exists, absolute zero, is −273.15 °C = −459.67 °F = 0 K; the converter does not accept anything below it. Kelvin simply adds 273.15 to Celsius, so 100 °C is 373.15 K.
The Fahrenheit scale goes back to Daniel Gabriel Fahrenheit (1724) and is today used for everyday temperatures mainly in the United States and a few other countries; most of the world, and all of science, uses Celsius or kelvin. Need the other direction? Use the Fahrenheit to Celsius converter. Weights are covered by kg to lbs.
Frequently asked questions
What is 37 C in F?
37 °C is 98.6 °F: 37 × 1.8 = 66.6, and 66.6 + 32 = 98.6. That is the textbook normal body temperature.
How do I convert Celsius to Fahrenheit?
Multiply the °C value by 1.8 and add 32. Example: 25 °C × 1.8 = 45, and 45 + 32 = 77 °F. For a rough weather estimate, double it and add 30.
What is 20 C in F?
20 °C is 68 °F. It is the usual room temperature; the shortcut gives 70 °F, so it overshoots by 2 degrees.
At what temperature are Celsius and Fahrenheit equal?
At −40. Solving °C × 1.8 + 32 = °C gives °C = −40, so −40 °C = −40 °F.
What is 180 C in F for an oven?
180 °C is 356 °F. A recipe that says 350 °F corresponds to 176.67 °C, which is why 180 °C is used as the standard setting.
Sources and legal basis
- NIST SP 811, Appendix B.8 – degree Celsius, degree Fahrenheit, kelvin: temperature: t(°F) = t(°C) × 9/5 + 32; T(K) = t(°C) + 273.15
- BIPM – The International System of Units (SI Brochure): kelvin and degree Celsius, 0 °C = 273.15 K
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