1 Fahrenheit to Celsius
-17.2 °C
1 °F = -17.2 °C.
Celsius
-17.2°C
1 °F = -17.2 °C
In short
How many Celsius is 1 Fahrenheit?
1 °F = -17.2 °C. 1 Fahrenheit = 0.555556 Celsius, then − 17.77777777777778, so the working is 1 × 0.555556 − 17.7778 = -17.2.
The working
The factor below is an exact definition rather than a measurement, so nothing is approximated in the arithmetic. The only rounding on this page happens where a number is displayed.
1 Fahrenheit = 0.555556 Celsius, then − 17.77777777777778 1 × 0.555556 − 17.7778 = -17.2
How much precision do you need?
Each row is the same answer cut at a different number of decimals, with what that choice costs you. Pick the shortest row whose error is smaller than whatever you are measuring with.
| Rounded to | Answer (°C) | Off by |
|---|---|---|
| Whole number | -17 | +0.22222 |
| 1 decimal | -17.2 | +0.02222 |
| 2 decimals | -17.22 | +0.00222 |
Round trip: take -17.2 °C back the other way and you land on 1.0400 °F — a drift of 0.0400 °F. That gap is the rounding, not the conversion.
What 1 °F looks like
0 °F
Zero Fahrenheit, which is -18 Celsius, is the freezer temperature the FDA recommends for keeping frozen food indefinitely safe.
Frequently asked questions
What is 1 Fahrenheit in Celsius?
1 Fahrenheit is -17.2 Celsius. 1 Fahrenheit = 0.555556 Celsius, then − 17.77777777777778, so the working is 1 × 0.555556 − 17.7778 = -17.2.
How accurate is -17.2 °C?
Rounding to -17.2 °C and converting straight back gives 1.0400 °F, a drift of 0.0400 °F from the 1 you started with. The factor itself is exact; every bit of that difference comes from the rounding, not the conversion.
Nearby values
Any value at all
Fahrenheit to Celsius Converter
Convert Fahrenheit to Celsius — fevers, recipes, and forecasts abroad.
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