-15 Fahrenheit to Celsius
-26.1 °C
-15 °F = -26.1 °C.
Celsius
-26.1°C
-15 °F = -26.1 °C
The short answer
How many Celsius is -15 Fahrenheit?
-15 °F = -26.1 °C. 1 Fahrenheit = 0.555556 Celsius, then − 17.77777777777778, so the working is -15 × 0.555556 − 17.7778 = -26.1.
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 -15 × 0.555556 − 17.7778 = -26.1
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 | -26 | +0.11111 |
| 1 decimal | -26.1 | +0.01111 |
| 2 decimals | -26.11 | +0.00111 |
Round trip: take -26.1 °C back the other way and you land on -14.9800 °F — a drift of 0.0200 °F. That gap is the rounding, not the conversion.
Frequently asked questions
What is -15 Fahrenheit in Celsius?
-15 Fahrenheit is -26.1 Celsius. 1 Fahrenheit = 0.555556 Celsius, then − 17.77777777777778, so the working is -15 × 0.555556 − 17.7778 = -26.1.
How accurate is -26.1 °C?
Rounding to -26.1 °C and converting straight back gives -14.9800 °F, a drift of 0.0200 °F from the -15 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.
Open the fahrenheit to celsius converter →