At One Place

5 gal to fl oz

5 US gallons in US fluid ounces
5 gal = 640 fl oz
fl oz = gal × 128

5 US gallons is 640 US fluid ounces. To get there, multiply by 128.

Values either side

US gallons near 5, converted to US fluid ounces.
US gallons US fluid ounces
2 gal 256
2.5 gal 320
3 gal 384
4 gal 512
5 gal ← 640
6 gal 768
7 gal 896
8 gal 1,024
9 gal 1,152

How the conversion works

The relationship is fl oz = gal × 128. Both units measure volume, so the conversion is a fixed factor that never changes. The figure is exact rather than approximate: since the international yard and pound agreement of 1959, an inch is defined as exactly 25.4 millimetres and a pound as exactly 0.45359237 kilograms, and every other imperial and US customary unit here is derived from those two.

US gallon: US liquid gallon. The imperial gallon is about 20% larger.

Common questions

What is 5 gal in US fluid ounces?
5 gal is 640 fl oz.
How do you convert US gallons to US fluid ounces?
Multiply by 128.

Related pages

Sources

  1. Guide for the Use of the International System of Units (SP 811) — NIST (Public domain (US Government))
  2. The International System of Units (SI Brochure) — Bureau International des Poids et Mesures
  3. Calculated on this page — At One Place

How these figures are compiled and checked