15 US gallons to liters
56.78 L
15 gal = 56.78 L.
liters
56.78L
15 gal = 56.78 L
The short answer
How many liters is 15 US gallons?
15 gal = 56.78 L. 1 US gallon = 3.785412 liters, so the working is 15 × 3.785412 = 56.78.
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 US gallon = 3.785412 liters 15 × 3.785412 = 56.78
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 (L) | Off by |
|---|---|---|
| Whole number | 57 | +0.21882 |
| 1 decimal | 56.8 | +0.01882 |
| 2 decimals | 56.78 | −0.00118 |
Round trip: take 56.78 L back the other way and you land on 14.9997 gal — a drift of 0.0003 gal. That gap is the rounding, not the conversion.
What 15 gal looks like
15.50 gal
The American half barrel keg holds 15.5 gallons, half of the 31 gallon barrel that federal law defines for beer.
Frequently asked questions
What is 15 US gallons in liters?
15 US gallons is 56.78 liters. 1 US gallon = 3.785412 liters, so the working is 15 × 3.785412 = 56.78.
How accurate is 56.78 L?
Rounding to 56.78 L and converting straight back gives 14.9997 gal, a drift of 0.0003 gal 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
Gallons to Liters Converter
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