Calchy.
Conversion - Fahrenheit to Celsius

What is 15°F in Celsius?

Answer
-9.4
°C
(15 − 32) × 5/9 = -9.4 °C
How we got there
  1. 01Subtract 32: 15 − 32 = -17.0
  2. 02Multiply by 5/9 (≈ 0.5556): -17.0 × 5/9 = -9.4 °C
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