A U.S. gallon of water weighs about 8.33 lb, gasoline about 6.2 lb and diesel about 7 lb. Truckers, pilots and boaters use this to estimate fuel weight.
How to use the Gallons to Pounds Converter
- Substance
- Custom density
- US gallons
- Every result field is editable: type into Pounds or any other result and US gallons plus every other field update to match.
Results update as you type, and every field accepts the units shown in its menu.
How it works
The calculator converts your volume to SI units, looks up the density of the selected substance in kg/m³ and multiplies. The result is then shown in pounds and other common units. Every result field is editable, so you can work backwards too.
How to convert US gallons to pounds
- Find the density of the substance (the menu fills it in for you).
- Convert the volume to SI units if needed.
- Multiply volume by density to get mass.
- Convert the answer to pounds.
1 US gallon of common substances in pounds
| Substance | Pounds per 1 US gal |
|---|---|
| Water (4 °C) | 8.3454045 |
| Water (20 °C) | 8.3303827 |
| Water (100 °C) | 7.9982356 |
| Seawater | 8.5540396 |
| Milk | 8.5957666 |
| Gasoline (petrol) | 6.2173263 |
| Diesel | 7.0101397 |
| Jet fuel (Jet A) | 6.7097052 |
| Kerosene | 6.7597776 |
| Crude oil (typical) | 7.2605019 |
| Ethanol | 6.5845241 |
| Propane (liquid) | 4.1142844 |
| Olive oil | 7.6193543 |
| Vegetable oil | 7.6861175 |
| Honey | 11.850474 |
| Beer | 8.4288585 |
| Orange juice | 8.7209477 |
| Latex paint (typical) | 10.849026 |
Densities used
| Substance | kg/m³ | g/mL | lb/US gal |
|---|---|---|---|
| Water (4 °C) | 1,000 | 1 | 8.3454045 |
| Water (20 °C) | 998.2 | 0.9982 | 8.3303827 |
| Water (100 °C) | 958.4 | 0.9584 | 7.9982356 |
| Seawater | 1,025 | 1.025 | 8.5540396 |
| Milk | 1,030 | 1.03 | 8.5957666 |
| Gasoline (petrol) | 745 | 0.745 | 6.2173263 |
| Diesel | 840 | 0.84 | 7.0101397 |
| Jet fuel (Jet A) | 804 | 0.804 | 6.7097052 |
| Kerosene | 810 | 0.81 | 6.7597776 |
| Crude oil (typical) | 870 | 0.87 | 7.2605019 |
| Ethanol | 789 | 0.789 | 6.5845241 |
| Propane (liquid) | 493 | 0.493 | 4.1142844 |
| Olive oil | 913 | 0.913 | 7.6193543 |
| Vegetable oil | 921 | 0.921 | 7.6861175 |
| Honey | 1,420 | 1.42 | 11.850474 |
| Beer | 1,010 | 1.01 | 8.4288585 |
| Orange juice | 1,045 | 1.045 | 8.7209477 |
| Latex paint (typical) | 1,300 | 1.3 | 10.849026 |
Inputs explained
| Field | What to enter |
|---|---|
| Substance | Choose one: Water (4 °C), Water (20 °C), Water (100 °C), Seawater … |
| Custom density | Units: g/cm³, kg/m³, kg/L, lb/ft³, lb/US gal |
| US gallons | Units: US gal, L, mL, cL, dL, m³ … |
What each result means
- Pounds = [US gallons] × [Density used]
- Kilograms = [US gallons] × [Density used]
- Short tons = [US gallons] × [Density used]
Formula
mass = volume × densityWorked example
Inputs — Substance: Water (20 °C); Custom density: 1 g/cm³; US gallons: 1 US gal.
Results — Density used = 0.9982 g/cm³; Pounds = 8.330383 lb; Kilograms = 3.778598 kg; Short tons = 0.004165 US ton.
Frequently asked questions
How much does a gallon of water weigh?
About 8.33 lb (8.34 lb at 4 °C).
How much does a gallon of gasoline weigh?
About 6.2 lb.
Why does the answer change with the ingredient?
US gallons and pounds measure different things (volume and weight), so the conversion depends on how dense the material is.
What if my ingredient is not listed?
Choose “Custom density” and type its density; the label or a quick weigh-and-measure test will give it.
What formula does the Gallons to Pounds Converter use?
mass = volume × density.