Convert imperial gallons (gal (UK)) to US fluid ounces (fl oz (US)).
Volume converter
Instant conversion
Edit either value. Decimals and scientific notation supported.
1
gal (UK)
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LitreL
MillilitremL
Cubic metrem³
Cubic centimetrecm³
Cubic footft³
Cubic inchin³
US liquid gallongal (US)
Imperial gallongal (UK)
US fluid ouncefl oz (US)
Imperial fluid ouncefl oz (UK)
US customary cupcup (US)
Metric cupcup (metric)
US liquid pintpt (US)
US liquid quartqt (US)
Imperial pintpt (UK)
Imperial quartqt (UK)
US customary teaspoontsp (US)
US customary tablespoontbsp (US)
Metric teaspoon (5 mL)tsp (metric)
Metric tablespoon (15 mL)tbsp (metric)
Cubic yardyd³
Imperial gillgi (UK)
Imperial peckpk (UK)
Imperial bushelbu (UK)
Imperial fluid drachmfl dr (UK)
Imperial minimminim (UK)
No units found. Try a name or symbol.
153.7215905
fl oz (US)
esc
LitreL
MillilitremL
Cubic metrem³
Cubic centimetrecm³
Cubic footft³
Cubic inchin³
US liquid gallongal (US)
Imperial gallongal (UK)
US fluid ouncefl oz (US)
Imperial fluid ouncefl oz (UK)
US customary cupcup (US)
Metric cupcup (metric)
US liquid pintpt (US)
US liquid quartqt (US)
Imperial pintpt (UK)
Imperial quartqt (UK)
US customary teaspoontsp (US)
US customary tablespoontbsp (US)
Metric teaspoon (5 mL)tsp (metric)
Metric tablespoon (15 mL)tbsp (metric)
Cubic yardyd³
Imperial gillgi (UK)
Imperial peckpk (UK)
Imperial bushelbu (UK)
Imperial fluid drachmfl dr (UK)
Imperial minimminim (UK)
No units found. Try a name or symbol.
CONVERSION
1 gal (UK) ≈ 153.7215905 fl oz (US)
6 significant figures
10 significant figures
15 significant figures
Precision changes displayed rounding, not calculation accuracy.
FORMULAfl oz (US) = gal (UK) × 153.721590464621
FORMULA & EXAMPLES
How to convert Imperial gallons to US fluid ounces
fl oz (US) = gal (UK) × 153.721590464621
Multiply the gal (UK) reading by 153.721590464621.
Worked examples
1 gal (UK) ≈ 153.7215905 fl oz (US)
1 × 153.721590464621 ≈ 153.7215905
5 gal (UK) ≈ 768.6079523 fl oz (US)
5 × 153.721590464621 ≈ 768.6079523
Frequently asked questions
Why do UK and US capacity readings differ?
The Imperial gallon is 4.54609 L, while the US liquid gallon is 3.785411784 L. Each system has 8 pints and 4 quarts per gallon. An Imperial gallon contains 160 Imperial fluid ounces; a US gallon contains 128 US fluid ounces.
Imperial gallons to US fluid ounces table
Fixed reference · Imperial gallon to US fluid ounce
Reference values use this page’s named pair and default context. Calculator precision and font settings do not change this table.
Imperial gallon (gal (UK))
US fluid ounce (fl oz (US))
0
0
0.1
15.37215905
0.5
76.86079523
1
153.7215905
2
307.4431809
5
768.6079523
10
1537.215905
25
3843.039762
50
7686.079523
100
15372.15905
1000
153721.5905
Table results use 10 significant figures; decimal formula coefficients use up to 15. Calculations use the unit definitions before rounding. Extra digits do not improve measurement accuracy.