gallons to fl oz converter

1 US gallon equals 128 US fluid ounces. Conversions use floz = gal × 128

gal → 128 floz

floz = gal × 128

Converter

Worked examples

1 gal = 128 floz
2 gal = 256 floz
5 gal = 640 floz
10 gal = 1,280 floz
100 gal = 12,800 floz

US gallons to US fluid ounces conversion table

gal	floz	Arithmetic
0.125 gal	16 floz	× 128
0.25 gal	32 floz	× 128
0.5 gal	64 floz	× 128
0.75 gal	96 floz	× 128
1 gal	128 floz	× 128
1.5 gal	192 floz	× 128
2 gal	256 floz	× 128
2.5 gal	320 floz	× 128
3 gal	384 floz	× 128
5 gal	640 floz	× 128
4 gal	512 floz	× 128
6 gal	768 floz	× 128
8 gal	1,024 floz	× 128
10 gal	1,280 floz	× 128
12 gal	1,536 floz	× 128
15 gal	1,920 floz	× 128
20 gal	2,560 floz	× 128
25 gal	3,200 floz	× 128
30 gal	3,840 floz	× 128
40 gal	5,120 floz	× 128
50 gal	6,400 floz	× 128
60 gal	7,680 floz	× 128
70 gal	8,960 floz	× 128
80 gal	10,240 floz	× 128
90 gal	11,520 floz	× 128
100 gal	12,800 floz	× 128

How to convert gal to floz

Take your value in US gallons.
Multiply by 128
That is your answer in US fluid ounces — no rounding needed until you choose a display precision.

Related conversions

floz to gal ml to floz L to floz cup to floz floz to ml floz to L floz to cup floz to tbsp floz to tsp all volume and cooking units

Questions

How many US fluid ounces in 1 US gallon?

Exactly 128 floz. The factor follows from the definitions of both units, not from a measurement, so it is exact.

How do I convert gal to floz?

Multiply the US gallons figure by 128 — or use the converter above, which updates as you type.

Is gal to floz the same as floz to gal?

No — they are inverses. One gal is 128 floz, while one floz is 0.0078125 gal.

What is 0.125 gal in floz?

0.125 gal = 16 floz (see the value page for the full arithmetic).