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Gallons to Liters Converter
↔ Convert L to gal instead

Common Conversions

gal L
0.25 0.946
0.5 1.893
1 3.785
2 7.571
5 18.927
10 37.854
20 75.708
55 208.198
100 378.541
500 1892.71
1000 3785.41

Why this conversion matters in chemistry

Gallons are a distinctly US unit, but they're the default for petroleum products, bulk chemical drums, and industrial solvent deliveries sold into the US market. A 5-gallon carboy holds 18.9 L; a 55-gallon drum holds 208 L. The conversion is a multiply by 3.78541, which is close enough to 3.8 that you can mental-estimate within about 0.1% if you'd rather not reach for a calculator. Once the gallon value lands in liters, the rest of chemistry takes over — molarity, density, gas-law substitution, all of which want liter-based volume.

Formula

L = gal × 3.78541

Worked Examples

1 gal = 3.785 L

The defining conversion. A US gallon of water weighs about 3.78 kg, a useful anchor for density-based estimations.

5 gal = 18.93 L

A standard carboy or jerry can size for bulk laboratory solvent storage.

55 gal = 208.2 L

A standard US shipping drum. The size that turns up on manifests for bulk solvents, acids, and industrial chemicals.

0.25 gal = 0.946 L

One quart — about 5.7% smaller than a liter. Close enough for casual estimation, not close enough for a precise molarity calculation.

Frequently Asked Questions

How do I convert gallons to liters?
Multiply by 3.78541. So 5 gallons is 18.93 L, 55 gallons is 208.2 L. Close enough to 3.8 that multiplying by 3.8 gets you within 0.1%, which is usually fine for mental ballparks.
Is a quart roughly a liter?
Close — 1 US quart is 0.946 L, about 5.7% less than a liter. Fine as a casual equivalence, but worth flagging when a recipe or calculation actually cares about precision. Don't use the shortcut for a molarity calculation.
How many liters in a 55-gallon drum?
208.2 liters. The 55-gallon drum is the standard bulk-shipping package for US solvent and chemical deliveries; handling the metric equivalent is often the first step when an inventory or safety calculation has to run.
Why does a chemistry student need this?
Word problems in general and environmental chemistry sometimes use gallons as a starting volume — treating pool water, dosing municipal supplies, running fuel-chemistry stoichiometry. Converting to liters is the first step so molarity (mol/L) and all the derived relationships work out cleanly.