Temperature conversion
Fahrenheit to Celsius converter
Convert °F to °C instantly, choose the displayed precision, and verify the result with the formula and reference table below.
Celsius (°C)
Rounded for display only; calculations retain full precision.
Rounding and precision rules
- Convr calculates first and rounds the displayed result only once, at the final step.
- The default is a maximum of 6 decimal places; trailing zeros are removed.
- Very small values that would appear as zero, and values of 10¹² or more, use scientific notation.
- Display precision is not measurement uncertainty. For scientific, engineering, or regulated work, retain only the digits justified by the source measurement.
Practical context
Understanding this conversion
Fahrenheit-to-Celsius conversion is useful for interpreting United States weather forecasts, oven settings, room temperatures, and medical readings in countries that use Celsius.
The order of operations matters: subtract 32 before multiplying by 5/9. Reversing those steps produces an incorrect result.
Reviewed August 16, 2026.
Calculation
Fahrenheit to Celsius formula
°C = (°F − 32) × 5/9
Calculations retain full precision and the result is rounded only for display.
Worked example
For 25 °F, the result is -3.888889 °C. Substitute 25 °F into the formula to obtain -3.888889 °C.
Temperature scales use both scale and offset, so this conversion is not a simple multiplication.
Fahrenheit to Celsius reference table
Common values rounded to a maximum of 6 decimal places.
| Fahrenheit (°F) | Celsius (°C) |
|---|---|
| 1 °F | -17.222222 °C |
| 5 °F | -15 °C |
| 10 °F | -12.222222 °C |
| 50 °F | 10 °C |
| 100 °F | 37.777778 °C |
Understanding the units
About Fahrenheit and Celsius
Fahrenheit (°F)
The Fahrenheit scale is widely used for everyday temperatures in the United States; water freezes at 32 °F.
Celsius (°C)
The Celsius scale sets water’s freezing point at 0 °C and boiling point at 100 °C at standard atmospheric pressure.
When this conversion is useful
Fahrenheit to Celsius conversion is useful for weather reports, cooking instructions, laboratory readings, engineering specifications, and scientific data. It lets you compare the same temperature reading across documents, tools, or standards that use different units.
Learn with Convr
Conversion guides
Celsius, Fahrenheit, Kelvin, and Rankine Explained
Learn how the four major temperature scales differ, why offsets matter, and which formulas convert between them correctly.
Read guide →FoundationsSignificant Figures and Rounding in Unit Conversions
Learn when to round conversion results, how significant figures preserve measurement meaning, and why more decimals do not guarantee more accuracy.
Read guide →Answers at a glance
Frequently asked questions
Why is 32 subtracted before converting Fahrenheit?
Subtracting 32 first aligns the Fahrenheit zero reference with the Celsius scale. Multiplying the remainder by 5/9 then adjusts the degree size.
What is 68 °F in Celsius?
Subtract 32 from 68 and multiply 36 by 5/9. The result is exactly 20 °C.
How does Convr round Fahrenheit to Celsius results?
Convr keeps full numeric precision during the calculation and rounds only the displayed result. The default is a maximum of 6 decimal places, with selectable precision on this page.
Can I convert negative or decimal fahrenheit values?
Yes. The converter accepts positive, negative, decimal, and scientific-notation values. Negative values are physically meaningful for some scales, such as temperature, but not for every measured quantity.
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