Fahrenheit to Celsius Converter
Convert Fahrenheit to Celsius — free, instant, accurate. Part of Temperature converters.
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Fahrenheit to Celsius: values and formula
Converting Fahrenheit to Celsius uses a scale conversion rather than a simple ratio. For example, 1 Fahrenheit is -17.222222222 Celsius, 10 Fahrenheit is -12.222222222 Celsius, and 100 Fahrenheit is 37.777777778 Celsius. Use the converter above for any value.
| Fahrenheit | Celsius |
|---|---|
| 1 Fahrenheit | -17.222222222 Celsius |
| 2 Fahrenheit | -16.666666667 Celsius |
| 5 Fahrenheit | -15 Celsius |
| 10 Fahrenheit | -12.222222222 Celsius |
| 25 Fahrenheit | -3.8888888889 Celsius |
| 50 Fahrenheit | 10 Celsius |
| 100 Fahrenheit | 37.777777778 Celsius |
| 500 Fahrenheit | 260 Celsius |
| 1000 Fahrenheit | 537.77777778 Celsius |
When to use the Fahrenheit to Celsius converter
- Cooking and baking — converting oven temperatures between °C and °F for international recipes.
- Weather forecasts — understanding overseas temperature reports.
- Scientific research — reporting results in Kelvin for thermodynamics calculations.
- HVAC and engineering — specifying climate control thresholds across regions.
A short history of temperature units
Temperature scales evolved alongside thermometers in the 1700s. Daniel Gabriel Fahrenheit anchored his 1724 scale to the freezing point of brine and human body temperature; Anders Celsius proposed his 0–100 water-based scale in 1742; and William Thomson (Lord Kelvin) introduced the absolute Kelvin scale in 1848 with zero set at the theoretical absence of thermal motion. Celsius is the global civil scale, Fahrenheit is dominant in the United States, and Kelvin is the SI unit used in science.
Common mistakes when converting temperature
Using the wrong formula direction
°F to °C is (F−32) × 5/9, not (F−32)/2 or (C×9/5)+32 reversed.
Forgetting Kelvin offset
Kelvin to Celsius subtracts 273.15, not 273. The 0.15 matters in precise scientific work.
Treating temperature differences like absolute values
A 10°C rise is 18°F, not 50°F — ratios apply to differences, not raw readings.
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