This converter turns pounds per US gallon into pounds per cubic foot instantly, using the exact factor 1 pound per US gallon = 7.480519481 pounds per cubic foot. Type any number and the result updates as you go — nothing is sent to a server, so the arithmetic happens entirely in your browser.
The drilling-mud and paint-industry density unit. The US construction unit for concrete, soil and timber density.
Because the relationship is a simple proportion, one multiplication does the whole job. The table further down gives pre-computed values for the amounts people look up most often, and the result panel also reports the reverse conversion so you can check the figure both ways.
The formula
pounds per US gallon- The amount you are converting, measured in pounds per US gallon
7.480519481- The exact number of pounds per cubic foot in one pound per US gallon
pounds per cubic foot- The converted result
How it works, step by step
- Enter the number of pounds per US gallon you want to convert.
- The value is multiplied by 7.480519481, the exact conversion factor.
- The result is displayed in pounds per cubic foot, rounded for readability.
- The unrounded value and the reverse conversion appear underneath so you can verify it.
Worked examples
Converting 5 pounds per US gallon
Multiply 5 by 7.4805195. That gives 37.4026 pounds per cubic foot. A quick sanity check: one pound per US gallon is larger than one pound per cubic foot, so the number should get bigger — and it does.
Converting 72 pounds per US gallon
72 × 7.4805195 = 538.5974 pounds per cubic foot. Working backwards, 538.5974 ÷ 7.4805195 returns 72 pounds per US gallon, which confirms the factor is applied the right way round.
How to read your score
Frequently asked questions
How many pounds per cubic foot are in one pound per US gallon?
Exactly 7.480519481. Every conversion on this page is that single number multiplied by your input, so the result carries no rounding error beyond what is shown.
What is the formula to convert pounds per US gallon to pounds per cubic foot?
Pounds Per Cubic Foot = pounds per US gallon × 7.480519481. To reverse it, divide instead: pounds per US gallon = pounds per cubic foot ÷ 7.480519481, which is the same as multiplying by 0.1336805556.
Is the pound per US gallon bigger than the pound per cubic foot?
Yes. One pound per US gallon equals 7.48052 pounds per cubic foot, so it is the larger unit.
Why does my answer differ slightly from other lb-gal to lb-ft3 converters?
Most differences come from rounding the factor too early. This tool keeps full double precision through the calculation and only rounds at the final display step, and it also shows the unrounded value so you can see exactly where any difference appears.
What is a pound per US gallon?
The drilling-mud and paint-industry density unit.
What is a pound per cubic foot?
The US construction unit for concrete, soil and timber density.
Pounds Per Us Gallon to pounds per cubic foot reference table
| Pounds Per Us Gallon | Pounds Per Cubic Foot |
|---|---|
| 0.5 lb/gal | 3.7403 lb/ft³ |
| 1 lb/gal | 7.4805 lb/ft³ |
| 2 lb/gal | 14.961 lb/ft³ |
| 3 lb/gal | 22.4416 lb/ft³ |
| 5 lb/gal | 37.4026 lb/ft³ |
| 10 lb/gal | 74.8052 lb/ft³ |
| 15 lb/gal | 112.2078 lb/ft³ |
| 20 lb/gal | 149.6104 lb/ft³ |
| 25 lb/gal | 187.013 lb/ft³ |
| 50 lb/gal | 374.026 lb/ft³ |
| 75 lb/gal | 561.039 lb/ft³ |
| 100 lb/gal | 748.0519 lb/ft³ |
| 250 lb/gal | 1,870.13 lb/ft³ |
| 500 lb/gal | 3,740.26 lb/ft³ |
| 1000 lb/gal | 7,480.52 lb/ft³ |
Exact factor: 1 pound per US gallon = 7.480519481 pounds per cubic foot. Values rounded for display.