30 Fahrenheit to Celsius
-1.1 °C
30 °F = -1.1 °C.
Celsius
-1.1°C
30 °F = -1.1 °C
The short answer
How many Celsius is 30 Fahrenheit?
30 °F = -1.1 °C. 1 Fahrenheit = 0.555556 Celsius, then − 17.77777777777778, so the working is 30 × 0.555556 − 17.7778 = -1.1.
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 30 × 0.555556 − 17.7778 = -1.1
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 | -1 | +0.11111 |
| 1 decimal | -1.1 | +0.01111 |
| 2 decimals | -1.11 | +0.00111 |
Round trip: take -1.1 °C back the other way and you land on 30.0200 °F — a drift of 0.0200 °F. That gap is the rounding, not the conversion.
What 30 °F looks like
32 °F
Water freezes at 32 degrees Fahrenheit at sea level, the lower fixed point Daniel Fahrenheit's scale was calibrated against.
Frequently asked questions
What is 30 Fahrenheit in Celsius?
30 Fahrenheit is -1.1 Celsius. 1 Fahrenheit = 0.555556 Celsius, then − 17.77777777777778, so the working is 30 × 0.555556 − 17.7778 = -1.1.
How accurate is -1.1 °C?
Rounding to -1.1 °C and converting straight back gives 30.0200 °F, a drift of 0.0200 °F from the 30 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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