What is the formula to convert Celsius to Fahrenheit?
To convert Celsius to Fahrenheit, multiply the Celsius temperature by 9/5 and then add 32. For example, 25 °C converts to 25 × 9/5 + 32 = 77 °F.
Celsius to Fahrenheit (°C → °F)
Formula
°F = (°C × 1.8) + 32Step-by-step
1
°F = (0 × 1.8) + 322
°F = 0 + 323
°F = 32Conversion Table
| °C | °F |
|---|---|
| 0 | 32.000 |
| 1.0000 | 33.800 |
| 2.0000 | 35.600 |
| 3.0000 | 37.400 |
| 4.0000 | 39.200 |
| 5.0000 | 41.000 |
| 6.0000 | 42.800 |
| 7.0000 | 44.600 |
| 8.0000 | 46.400 |
| 9.0000 | 48.200 |
| 10.000 | 50.000 |
| 11.000 | 51.800 |
| 12.000 | 53.600 |
| 13.000 | 55.400 |
| 14.000 | 57.200 |
| 15.000 | 59.000 |
| 16.000 | 60.800 |
| 17.000 | 62.600 |
| 18.000 | 64.400 |
| 19.000 | 66.200 |
| °C | °F |
|---|---|
| 20.000 | 68.000 |
| 21.000 | 69.800 |
| 22.000 | 71.600 |
| 23.000 | 73.400 |
| 24.000 | 75.200 |
| 25.000 | 77.000 |
| 26.000 | 78.800 |
| 27.000 | 80.600 |
| 28.000 | 82.400 |
| 29.000 | 84.200 |
| 30.000 | 86.000 |
| 31.000 | 87.800 |
| 32.000 | 89.600 |
| 33.000 | 91.400 |
| 34.000 | 93.200 |
| 35.000 | 95.000 |
| 36.000 | 96.800 |
| 37.000 | 98.600 |
| 38.000 | 100.40 |
| 39.000 | 102.20 |
| °C | °F |
|---|---|
| 40.000 | 104.00 |
| 41.000 | 105.80 |
| 42.000 | 107.60 |
| 43.000 | 109.40 |
| 44.000 | 111.20 |
| 45.000 | 113.00 |
| 46.000 | 114.80 |
| 47.000 | 116.60 |
| 48.000 | 118.40 |
| 49.000 | 120.20 |
| 50.000 | 122.00 |
| 51.000 | 123.80 |
| 52.000 | 125.60 |
| 53.000 | 127.40 |
| 54.000 | 129.20 |
| 55.000 | 131.00 |
| 56.000 | 132.80 |
| 57.000 | 134.60 |
| 58.000 | 136.40 |
| 59.000 | 138.20 |
| °C | °F |
|---|---|
| 60.000 | 140.00 |
| 61.000 | 141.80 |
| 62.000 | 143.60 |
| 63.000 | 145.40 |
| 64.000 | 147.20 |
| 65.000 | 149.00 |
| 66.000 | 150.80 |
| 67.000 | 152.60 |
| 68.000 | 154.40 |
| 69.000 | 156.20 |
| 70.000 | 158.00 |
| 71.000 | 159.80 |
| 72.000 | 161.60 |
| 73.000 | 163.40 |
| 74.000 | 165.20 |
| 75.000 | 167.00 |
| 76.000 | 168.80 |
| 77.000 | 170.60 |
| 78.000 | 172.40 |
| 79.000 | 174.20 |
Celsius to Fahrenheit Conversion
The Celsius and Fahrenheit temperature scales relate through both a scale factor and an offset. Celsius measures temperature based on the freezing (0 °C) and boiling points (100 °C) of water, while Fahrenheit sets these points at 32 °F and 212 °F respectively, requiring the conversion formula °F = °C × 9/5 + 32. This conversion is widely used in weather forecasting and cooking across regions using different temperature systems. The offset of 32 degrees and the scaling factor of 9/5 make direct conversion non-linear compared to simple unit scaling.
Sources: NIST Special Publication 811
Celsius → Fahrenheit
Converting Celsius (°C) to Fahrenheit (°F) is a common temperature conversion. 1 °C equals 33.8 °F. For example, 100 °C is equal to 212 °F.
Quick Mental Math: Celsius to Fahrenheit
Approximate by doubling °C and adding 30 for °F (e.g., 20 °C ≈ 70 °F).
Why is converting Celsius to Fahrenheit tricky?
The conversion involves both a multiplication factor and an additive offset, causing confusion when converting, especially reversing the calculation.
Quick Reference Values
-40 °C = -40 °F. 0 °C = 32 °F. 10 °C = 50 °F. 20 °C = 68 °F. 25 °C = 77 °F. 37 °C = 98.6 °F. 40 °C = 104 °F. 100 °C = 212 °F.
Centigrade vs Celsius
The term 'centigrade' was formerly used for this temperature scale but was replaced by 'Celsius' to avoid confusion with angular measurements. The modern standard term recognized by the International System of Units (SI) is Celsius.
What is Celsius?
Celsius (°C) is a unit of temperature. Celsius is a temperature scale where 0 °C is the freezing point and 100 °C is the boiling point of water at standard atmospheric pressure. It is defined by the International System of Units (SI) and related to the Kelvin scale by the formula °C = K − 273.15 [cgpm-resolutions]. The Celsius scale was developed by Anders Celsius in 1742. It became internationally accepted and officially incorporated into the SI temperature scales by the CGPM in 1948 for scientific and everyday temperature measurement [cgpm-resolutions]. Celsius is the standard temperature unit for most countries worldwide, including Canada, Europe, and Australia. It is used in weather forecasts, scientific research, and industrial processes as endorsed by ISO and BIPM [bipm-si-brochure].
What is Fahrenheit?
Fahrenheit (°F) is a unit of temperature. Fahrenheit is a temperature scale where water freezes at 32°F and boils at 212°F under standard atmospheric pressure. It defines temperature units based on intervals of 1/180th between these points. One degree Fahrenheit equals 5/9 of a kelvin or Celsius degree, making precise conversions essential in scientific and engineering contexts [cgpm-resolutions]. The Fahrenheit scale was created by Daniel Gabriel Fahrenheit in 1724 to provide a practical temperature measurement for weather and industrial processes. It was adopted widely in English-speaking countries and influenced early thermometry standards [nist-sp-811]. Fahrenheit remains the primary temperature scale in the United States and some Caribbean nations for everyday use. Scientific and international standards favor Celsius or kelvin, but Fahrenheit persists in HVAC, weather forecasting, and cooking within these regions [nist-sp-811].
Common Misspellings
People often search for this conversion using these alternate spellings: celcius, celsious, celcius, celsius degree, fahranheit, farenheit, fahrentheit, farhenheit. All of these refer to the Celsius to Fahrenheit conversion.
FAQ
Why can't I just multiply Celsius by a fixed number to get Fahrenheit?
Because Fahrenheit has an offset of 32 degrees, simple multiplication is insufficient. The formula includes adding 32 after scaling to account for this offset.
Is the conversion the same when going from Fahrenheit to Celsius?
No. To convert Fahrenheit to Celsius, subtract 32 first, then multiply by 5/9. For example, 68 °F converts to (68 − 32) × 5/9 = 20 °C.
When do Celsius and Fahrenheit read the same?
The Celsius and Fahrenheit scales intersect at -40 degrees. That is, -40 °C is exactly equal to -40 °F. This is the only point where both scales show the same numerical value.