Grams per cm³ to Pounds per Gallon Density Converter

g/cm³

lb/gal

Common Conversions

g/cm³	lb/gal
0.1	0.835
0.5	4.173
1	8.345
2	16.691
5	41.727
10	83.454
25	208.635
50	417.27
100	834.54
1000	8345.4

Why this conversion matters in chemistry

Lab density values run in g/cm³; US bulk-storage and tank inventory systems run in pounds per US gallon. Concentrated sulfuric acid at 1.84 g/cm³ becomes 15.36 lb/gal — the value that goes into a tank-farm spreadsheet when reconciling a chemistry data sheet against a US inventory log. The multiplier of 8.3454 lb per US gallon for water density (1.00 g/cm³) is the anchor — it falls out of (3785.41 mL/gal) ÷ (453.592 g/lb). Multiplying by that same factor scales any other density into US units. Useful most when a European-spec reagent has to land in a US-spec tank-volume calculation.

Formula

lb/gal = g/cm³ × 8.34540

Worked Examples

1 g/cm³ = 8.345 lb/gal

The density of water — the conversion anchor and the reference behind the "a US gallon of water weighs 8.34 lb" mnemonic.

1.84 g/cm³ = 15.36 lb/gal

Concentrated 98% sulfuric acid — the value behind any bulk-acid tank weight calculation.

0.789 g/cm³ = 6.585 lb/gal

Ethanol at room temperature — useful when sizing or weighing a bulk solvent shipment.

Frequently Asked Questions

How do I convert g/cm³ to lb/gal?

Multiply by 8.3454 for the US gallon. The factor comes from 3785.41 mL per US gal divided by 453.592 g per lb — exact through the SI definitions of both.

Is lb/gal based on US or Imperial gallons?

This conversion uses the US gallon (3.785 L). The UK Imperial gallon is larger at 4.546 L, so the same density gives a higher lb/gal value (about 10.02 lb/gal for water in Imperial units). Confirm which gallon a spec uses before converting.

How heavy is a 5-gallon bucket of concentrated acid?

Concentrated sulfuric acid at 1.84 g/cm³ comes to 15.36 lb/gal, so a 5-gallon container holds about 77 lb — call it 35 kg. That weight matters for safe handling and for the floor loading of an acid storage cabinet.