Celsius to Fahrenheit Converter
Convert Celsius to Fahrenheit and back. F = C x 9/5 + 32.
Tip: Results show up to 8 significant digits. The factors and their sources are listed on the "Where our numbers come from" page.
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Celsius and Fahrenheit
Celsius and Fahrenheit are two ways to measure the same temperature, related by the formula F = C x 9/5 + 32. The converter works both ways: use the two tabs at the top of the tool to choose the direction.
Quick conversion table
Celsius to Fahrenheit
| Celsius | Fahrenheit |
|---|---|
| -40 °C | -40 °F |
| -20 °C | -4 °F |
| -10 °C | 14 °F |
| 0 °C | 32 °F |
| 10 °C | 50 °F |
| 20 °C | 68 °F |
| 25 °C | 77 °F |
| 30 °C | 86 °F |
| 37 °C | 98.6 °F |
| 50 °C | 122 °F |
| 100 °C | 212 °F |
| 180 °C | 356 °F |
| 200 °C | 392 °F |
| 220 °C | 428 °F |
Fahrenheit to Celsius
| Fahrenheit | Celsius |
|---|---|
| -40 °F | -40 °C |
| 0 °F | -17.777778 °C |
| 32 °F | 0 °C |
| 50 °F | 10 °C |
| 68 °F | 20 °C |
| 86 °F | 30 °C |
| 98.6 °F | 37 °C |
| 212 °F | 100 °C |
| 350 °F | 176.66667 °C |
| 400 °F | 204.44444 °C |
| 450 °F | 232.22222 °C |
Exact factor and source
| Conversion | Formula | Basis |
|---|---|---|
| Celsius to Fahrenheit | F = C x 9/5 + 32 | SI Brochure, 9th edition (BIPM 2019): degree Celsius, defined from the kelvin (0 C = 273.15 K) |
| Fahrenheit to Celsius | C = (F - 32) x 5/9 | NIST SP 811 (2008), Appendix B.8: F = C x 9/5 + 32 |
How to convert degrees Celsius to degrees Fahrenheit
- Step oneTake the temperature in degrees Celsius.
- Step twoMultiply it by 9/5 (that is 1.8).
- Step threeAdd 32.
- Step fourThe result is the temperature in degrees Fahrenheit. To go back, subtract 32 and multiply by 5/9.
Example: 100 C x 9/5 + 32 = 212 F.
All temperature units compared
Each unit written in degrees Celsius, the base unit of this tool. Exact values come straight from the definitions.
| Unit | Symbol | Relation to Celsius |
|---|---|---|
| Degrees Celsius | °C | base unit |
| Degrees Fahrenheit | °F | C = (F - 32) x 5/9 |
| Kelvins | K | C = K - 273.15 |
What is Celsius?
Celsius sets 0 degrees at the freezing point of water and 100 degrees at its boiling point at standard pressure. Most countries use it for weather and cooking.
What is Fahrenheit?
Fahrenheit puts the freezing point of water at 32 degrees and its boiling point at 212 degrees at standard pressure. The United States uses it for weather and ovens.
What this converter does not do
- Results are rounded for display to 8 significant digits; the stored factor is the exact one.
- It converts a temperature reading. A temperature difference converts differently: a change of 10 degrees Celsius is a change of 18 degrees Fahrenheit.
- It does not account for pressure, altitude or the boiling point of any liquid.
Frequently asked questions
What are 0 and 100 degrees Celsius in degrees Fahrenheit?
0 °C is 32 °F, and 100 °C is 212 °F. The two scales are related by a formula, F = C x 9/5 + 32, not by a single factor.
What are 0 and 100 degrees Fahrenheit in degrees Celsius?
0 °F is -17.7777777778 °C, and 100 °F is 37.7777777778 °C. Use the other tab of the converter to go in this direction.
What is normal body temperature in Fahrenheit?
Normal body temperature is commonly given as 37 degrees Celsius, which is 98.6 degrees Fahrenheit.
Where do the factors come from?
Degrees Celsius: SI Brochure, 9th edition (BIPM 2019): degree Celsius, defined from the kelvin (0 C = 273.15 K). Degrees Fahrenheit: NIST SP 811 (2008), Appendix B.8: F = C x 9/5 + 32.
References
- Celsius: SI Brochure, 9th edition (BIPM 2019): degree Celsius, defined from the kelvin (0 C = 273.15 K)
- Fahrenheit: NIST SP 811 (2008), Appendix B.8: F = C x 9/5 + 32
- NIST Special Publication 811: Guide for the Use of the International System of Units (SI), 2008 edition.
- The International System of Units (SI Brochure), 9th edition, BIPM.