-40 fahrenheit to celsius
Convert -40 Fahrenheit to Celsius — the answer, the arithmetic and the closest common values, all on one page.
Show your work
-40 °F × 0.555556 − 17.778 = -40 °C.
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Questions
What is -40 Fahrenheit in Celsius?
-40 °F = -40 °C. The arithmetic: -40 °F × 0.555556 − 17.778 = -40 °C.
How precise is this result?
The factor is exact by definition, so the only rounding is the display. Higher precision is available on the °F to °C converter page.
What is -40 °C in °F?
-40 °C = -40 °F — the inverse direction.