-30 Fahrenheit to Celsius
-34.4 °C
-30 °F = -34.4 °C.
Celsius
-34.4°C
-30 °F = -34.4 °C
The short answer
How many Celsius is -30 Fahrenheit?
-30 °F = -34.4 °C. 1 Fahrenheit = 0.555556 Celsius, then − 17.77777777777778, so the working is -30 × 0.555556 − 17.7778 = -34.4.
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 = -34.4
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 | -34 | +0.44444 |
| 1 decimal | -34.4 | +0.04444 |
| 2 decimals | -34.44 | +0.00444 |
Round trip: take -34.4 °C back the other way and you land on -29.9200 °F — a drift of 0.0800 °F. That gap is the rounding, not the conversion.
Frequently asked questions
What is -30 Fahrenheit in Celsius?
-30 Fahrenheit is -34.4 Celsius. 1 Fahrenheit = 0.555556 Celsius, then − 17.77777777777778, so the working is -30 × 0.555556 − 17.7778 = -34.4.
How accurate is -34.4 °C?
Rounding to -34.4 °C and converting straight back gives -29.9200 °F, a drift of 0.0800 °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
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