Formula:

* C = (F - 32) × 5/9

Where:

* C = Temperature in Celsius

* F = Temperature in Fahrenheit

Calculation:

1. Subtract 32 from 400: 400 - 32 = 368

2. Multiply the result by 5/9: 368 × (5/9) = 204.44°C (approximately)

Therefore, 400°F is approximately equal to 204.44°C.