Convert Fahrenheit to Celsius
Live bidirectional calculator for Fahrenheit (°F) and Celsius (°C) with verified formula and conversion charts.
Temperature4 units
How the Calculation Works (Affine Transformation)
Subtract 32 from the Fahrenheit temperature to align the zero point, then multiply by 5/9 to convert degrees.
Fahrenheit to Celsius Conversion Table
Precomputed values for quick reference and printing.
| Fahrenheit | Celsius |
|---|---|
| 1 °F | -17.2222 °C |
| 2 °F | -16.6667 °C |
| 3 °F | -16.1111 °C |
| 4 °F | -15.5556 °C |
| 5 °F | -15 °C |
| 6 °F | -14.4444 °C |
| 7 °F | -13.8889 °C |
| 8 °F | -13.3333 °C |
| 9 °F | -12.7778 °C |
| 10 °F | -12.2222 °C |
| 15 °F | -9.4444 °C |
| 20 °F | -6.6667 °C |
| 25 °F | -3.8889 °C |
| 30 °F | -1.1111 °C |
| 40 °F | 4.4444 °C |
| 50 °F | 10 °C |
| 75 °F | 23.8889 °C |
| 100 °F | 37.7778 °C |
| Celsius | Fahrenheit |
|---|---|
| 1 °C | 33.8 °F |
| 2 °C | 35.6 °F |
| 3 °C | 37.4 °F |
| 4 °C | 39.2 °F |
| 5 °C | 41 °F |
| 6 °C | 42.8 °F |
| 7 °C | 44.6 °F |
| 8 °C | 46.4 °F |
| 9 °C | 48.2 °F |
| 10 °C | 50 °F |
| 15 °C | 59 °F |
| 20 °C | 68 °F |
| 25 °C | 77 °F |
| 30 °C | 86 °F |
| 40 °C | 104 °F |
| 50 °C | 122 °F |
| 75 °C | 167 °F |
| 100 °C | 212 °F |
📌 Standard Benchmark Reference Values
Freezing point of water at 1 atm.
Exact RatioBoiling point of water at standard sea-level pressure.
Exact RatioCoincidence point where Celsius and Fahrenheit scales intersect.
Exact RatioAbout Fahrenheit (°F)
The Fahrenheit scale sets 32 °F as the freezing point of water and 212 °F as the boiling point at standard atmospheric pressure, with 180 equal divisions between them.
History: Invented by Daniel Gabriel Fahrenheit in 1724. Originally based on three reference points: brine freezing, water freezing, and human body temperature.
Common Uses: Everyday temperature measurement in the United States, Belize, the Cayman Islands, and Palau.
About Celsius (°C)
The Celsius scale is defined so that 0 °C is the freezing point of water and 100 °C is the boiling point of water at standard atmospheric pressure.
History: Proposed by Anders Celsius in 1742 (originally inverted). The modern direction was established by Carl Linnaeus. Renamed from "centigrade" to "Celsius" in 1948 by the 9th CGPM.
Common Uses: Daily weather, cooking, scientific measurement, and industrial processes worldwide (except the US for everyday use).
❓ Frequently Asked Questions
What is 1 °F in °C?
1 Fahrenheit (°F) is equal to -17.2222 Celsius (°C). Unlike linear units, temperature scales have differing zero offsets.
What is the formula to convert Fahrenheit to Celsius?
The formula is: °C = (°F - 32) × 5/9. Subtract 32 from the Fahrenheit temperature to align the zero point, then multiply by 5/9 to convert degrees.
How do I convert 1 °F to °C manually?
To convert 1 °F to °C: apply the formula °C = (°F - 32) × 5/9. Substituting gives: (1 - 32) × 5/9 = -17.2222 °C.