How do you convert gallons to milliliters?

You convert gallons to litres and then to millilitres.

I will use Imperial gallons. (The conversion factor for US gallons is 1 US gal = 3.785 L).

EXAMPLE:

Convert 10.0 gallons to millilitres.

10.0 gal × ##(4.546 L)/(1 gal)## = 45.5 L

45.5 L × ##(1000 mL)/(1 L)## = 45 500 mL = 4.55 × 10⁴ mL

Notice how we set up the conversion factors to make the units cancel.

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