Free material volume converter
Pounds to Gallons Calculator
Convert pounds to US gallons, liters, or cubic inches using the selected material's density. Choose a substance or enter a custom density to estimate its volume.
Instant conversion
Convert pounds to volume
Select a material and output unit. Gallons are US liquid gallons.
Formula: volume = weight ÷ density
Volume at a glance
Visual estimate
The gauge scales to the calculated volume.
Compared with a 10 US gallon tank
The conversion
How Pound Volume Calculator works
Divide the weight in pounds by the material density in pounds per US gallon. Density is the link between weight and volume.
For example, 10 pounds of water at about 8.34 lb/US gal is approximately 1.20 US gallons. The same weight of another material produces a different volume.
Quick reference
Pounds of water to gallons
Approximate values using 8.34 lb per US gallon. Water density varies slightly with temperature.
| Weight (lb) | US gallons | Liters |
|---|---|---|
| 1 | 0.12 | 0.45 |
| 5 | 0.60 | 2.27 |
| 10 | 1.20 | 4.54 |
| 20 | 2.40 | 9.08 |
| 50 | 6.00 | 22.69 |
| 100 | 11.99 | 45.39 |
Use the right material
Why density matters
There is no universal pounds-to-gallons conversion. A gallon of one substance can weigh more or less than a gallon of another. Select the closest material preset or use a known density for a more relevant weight-to-volume estimate.
- Choose a material: select a built-in density or enter a known custom density.
- Choose an output: see US gallons, liters, cubic inches, or cubic feet.
- Check conditions: temperature affects liquids; packing and moisture affect powders and other bulk materials.
Density values are estimates. For precise work, use a reliable density value for the specific material and conditions.
Quick answers
Pounds to gallons calculator FAQs
How do you convert pounds to gallons?
Divide the weight in pounds by the material's density in pounds per US gallon. The same weight occupies a different volume in different materials.
How many gallons are in a pound?
There is no single answer for every material. Pounds measure weight and gallons measure volume, so you need the material's density to calculate the volume.
How many gallons is 10 pounds of water?
Using an approximate water density of 8.34 pounds per US gallon, 10 pounds of water is about 1.20 US gallons. Water density varies slightly with temperature.
Can I convert pounds to gallons without knowing the material?
Not precisely. Select a material with a suitable density or enter a known density. If the exact density is unknown, the result is an estimate.
Does this calculator use US or Imperial gallons?
The calculator uses US liquid gallons. A US gallon is different in size from an Imperial gallon, so check the gallon type when comparing results or density values.
Can I convert pounds to liters or cubic inches?
Yes. Choose liters or cubic inches as the output unit. The calculator uses the selected material's density, then converts the volume to your chosen unit.
How accurate is a pounds-to-volume estimate?
Accuracy depends on how closely the selected density matches the actual material and its conditions. Temperature can affect liquids, while packing and moisture can affect powders.