400 US gallons in liters
Result
The conversion result is: 400 US gallons is equivalent to 1514.1647136 liters.[1]
Conversion formula
How to convert 400 US gallons to liters?
We know (by definition) that: 1 usgallon ≈ 3.785411784 liter.
We can set up a proportion to solve for the number of liters.
1 usgallon / 400 usgallon ≈ 3.785411784 liter / x liter
Now, we cross multiply to solve for our unknown x:
x liter ≈ (400 usgallon / 1 usgallon) * 3.785411784 liter → x liter ≈ 1514.1647136 liter
Conclusion:
400 usgallon ≈ 1514.1647136 liter

Conversion in the opposite direction
The inverse of the conversion factor is that 1 liter is equal to 0.000660430130895371 times 400 US gallons.
It can also be expressed as: 400 US gallons is equal to 1 / 0.000660430130895371 liters.
Approximation
An approximate numerical result would be: four hundred US gallons is about one thousand, five hundred and fourteen point one six liters, or alternatively, a liter is about zero times four hundred US gallons.
Footnotes
[1] The precision is 15 significant digits (fourteen digits to the right of the decimal point).
Results may contain small errors due to the use of floating point arithmetic.