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最終更新日: 2026年7月17日
Gallons to Pounds Converter
レビュアー
レビュアー
Quick Answer
This gallons to pounds converter uses density in pounds per US gallon to convert volume to weight and weight back to volume for more than 40 liquids. It supports US liquid, UK imperial, and US dry gallons, and also reports liters, kilograms, ounces, cubic feet, barrels, tons, and the density used.
To convert gallons to pounds, first express the chosen gallon type as US gallons, then multiply by the liquid density in pounds per US gallon. To convert pounds back to gallons, divide by density and scale to the gallon type you want.
重要ポイント
- Gallons convert to pounds only after you account for the liquid's density in lb per US gallon.
- The calculator supports US liquid, UK imperial, and US dry gallons through internal gallon-factor normalization.
- Water weighs 8.3454 lb/US gal, gasoline 6.073, diesel 7.094, milk 8.637, honey 11.85, olive oil 7.65, and seawater 8.556.
- Pounds-to-gallons conversion is the reverse process: divide weight by density, then scale to the selected gallon type.
- Weight estimates improve planning for transport, storage, food production, agriculture, and industrial safety.
レビュアー
レビュアー
数式
pounds = gallons × ρ (or gallons = pounds ÷ ρ)
ここで:
- m_{lb}=Mass(pounds (lb))
- V_{gal}=Volume(US gallons (gal))
- \rho_{lb/gal}=Density(lb/US gal)
解法例
5 US gallons of water to pounds
A standard water conversion for hauling, plumbing, or tank sizing.
- 1Use the US gallon factor of 1, so 5 ÷ 1 = 5 US gallons
- 2Multiply by water density: 5 × 8.3454 = 41.727 pounds
- 3The converter also reports liters, kilograms, ounces, cubic feet, barrels, and tons
10 US gallons of gasoline to pounds
Estimate fuel weight for transport, storage, or payload planning.
- 1US gallons stay in US-gallon units because the factor is 1
- 2Multiply the volume by gasoline density: 10 × 6.073 = 60.73 pounds
- 3This is why fuel weighs less than the same volume of water
100 pounds of honey to US gallons
Convert bulk food weight back to liquid volume for production planning.
- 1Divide the weight by honey density: 100 ÷ 11.85 = 8.439 US gallons
- 2Because the selected gallon type is US, no additional gallon-factor conversion is needed
- 3Dense liquids like honey occupy much less volume for the same weight
はじめに
The Gallons to Pounds Converter converts liquid volume to weight — and weight back to volume — by applying density in pounds per US gallon. The core relationship is simple: pounds = gallons × density after first normalizing the chosen gallon type to US liquid gallons. That makes the tool useful for water, gasoline, diesel, milk, honey, olive oil, seawater, and dozens of other liquids and bulk-flow materials. If you also need straight volume conversions, try our gallons to liters converter or gallons to cubic feet converter. For physical-property reference data, see the NIST Chemistry WebBook and broader measurement guidance from NIST.
Understanding Density in Gallons-to-Pounds Conversions
Density explains why one gallon of honey is much heavier than one gallon of gasoline. This calculator stores density as lb per US gallon, then adjusts UK and US dry gallons to their US-gallon equivalent before calculating weight.
Gallons → pounds: convert the selected gallon type to US gallons, then multiply by density
Pounds → gallons: divide pounds by density to get US gallons, then scale to the requested gallon type
Water at room temperature is 8.3454 lb/US gal, so it serves as a common baseline
Higher density means more pounds for the same volume
Lower density means more volume for the same weight
Temperature changes density slightly, which is why cold, room-temperature, and boiling water use different values.
Liquid Density Reference for Common Fluids
The calculator covers more than 40 liquids and liquid-like materials. The values below are representative engineering approximations for standard conditions; always confirm exact density if you are working with regulated shipments or process-critical formulations.
| Liquid | Density (lb/US gal) | Typical use |
|---|---|---|
| Water (68°F/20°C) | 8.3454 | Plumbing, pools, tanks, irrigation |
| Gasoline (Regular) | 6.073 | Fuel logistics and vehicle payload |
| Diesel Fuel | 7.094 | Fleet storage and transport |
| Milk (Whole) | 8.637 | Food processing and dairy batching |
| Honey | 11.85 | Food production and packaging |
| Olive Oil | 7.65 | Food service and manufacturing |
| Seawater | 8.556 | Marine and desalination work |
Use the Custom Liquid option when you have a supplier-provided density from a technical data sheet.
US vs UK Gallons vs US Dry Gallons
A gallon is not a universal size. The calculator supports US liquid gallons, UK imperial gallons, and US dry gallons, then converts them internally so density data stays consistent.
1 UK gallon contains more volume than 1 US liquid gallon
1 US dry gallon is used for dry-measure contexts but can still be normalized here
The density values remain anchored to US liquid gallons for consistency
Choosing the correct gallon type matters whenever you compare legacy specifications or international documentation
| Gallon type | Relative factor | Approximate liters |
|---|---|---|
| US liquid gallon | 1 | 3.78541 L |
| UK imperial gallon | 1.20095 | 4.54609 L |
| US dry gallon | 1.16365 | 4.40488 L |
Industrial Applications
In industrial settings, converting between gallons and pounds helps teams compare tank volume, shipping weight, and material usage without switching between manual charts and hand calculations.
Fuel terminals estimate storage weight for gasoline, diesel, and jet fuel
Chemical plants translate gallons into pounds for batching, inventory, and compliance records
Manufacturers compare drum or tote capacity with truck payload or floor-load limits
Maintenance teams estimate oil, coolant, or antifreeze mass before service work
Operators can cross-check values with NIST and supplier technical data for traceability
Agricultural & Food Applications
Agriculture and food processing often buy, store, and dispense liquids by volume, but report output, nutrition, or shipping by weight. A fast gallons-to-pounds conversion closes that gap.
Farmers can estimate sprayer load and tank weight for water, liquid fertilizer, or additives
Dairies and processors can convert milk volume into shipping weight
Apiaries and food packers can estimate honey yield by either volume or mass
Edible-oil operations can compare gallons in storage with pounds sold or blended
Related tools like the gallons to tons converter help when larger bulk weights are needed
Safety Considerations
Weight estimates are essential for safe handling. Tank supports, trailer axles, shelving, forklifts, and manual-lift plans all depend on the real mass of the liquid — not just its volume.
Never assume all liquids weigh the same as water
Flammable liquids such as gasoline, ethanol, and propane may need temperature-corrected density in regulated environments
Corrosive chemicals like sulfuric acid and sodium hydroxide require verified SDS and engineering data before movement
Use conservative margins when lifting drums, IBC totes, or filled process vessels
For high-accuracy physical properties, consult sources such as the NIST Chemistry WebBook and ASTM/API documentation
クイックリファレンスカード
Gallons to Pounds Converter — Quick Reference
クイックリファレンス • Gallons to Pounds Converter
pounds = (selected gallons ÷ gallon factor) × density; gallons = (pounds ÷ density) × gallon factor有効範囲: Use non-negative values with a positive density in lb/US gal.
一般的な値
⚠ 注意
- •Density must match the actual liquid; using water as a default can misstate weight badly.
- •Verify whether the source volume is US liquid, UK imperial, or US dry gallons before converting.
- •Hazardous chemicals and fuels may require temperature-corrected density from an SDS or lab data.
- •Container, drum, tote, or tank tare weight is separate from the liquid weight calculated here.
プロのヒント
- →Use custom density when your supplier provides a product-specific lb/US gal value.
- →For reverse conversion, start with pounds ÷ density to get US gallons before changing gallon type.
- →Check both pounds and kilograms when planning freight or equipment loads.
- →For bulk oil or fuel work, also compare barrels and cubic feet outputs to standard storage units.
よくある質問
How many pounds is 1 gallon of water?
At about 68°F (20°C), 1 US gallon of water weighs 8.3454 pounds. The exact number shifts slightly with temperature, which is why the calculator includes cold, room-temperature, and boiling-water values.
How many pounds is 1 gallon of gasoline?
Using the calculator's standard density for regular gasoline, 1 US gallon weighs 6.073 pounds. Gasoline is lighter than water, so the same gallon volume weighs less.
What is the difference between US and UK gallons?
A UK imperial gallon is larger than a US liquid gallon. One UK gallon is about 4.546 liters, while one US gallon is about 3.785 liters. Because the volume is larger, the same liquid in 1 UK gallon weighs more than in 1 US gallon.
How do I convert pounds to gallons?
Divide pounds by the liquid's density in lb/US gal to get US gallons, then multiply by the gallon factor if you want UK or US dry gallons. For example, 100 lb of honey ÷ 11.85 = about 8.439 US gallons.
Why does the same volume of different liquids weigh different amounts?
Because density differs from one substance to another. A gallon of honey packs more mass into the same space than a gallon of gasoline, so it weighs much more.
How many pounds is a 55-gallon drum of water?
A 55-gallon drum of water weighs about 458.997 pounds of water alone, using 55 × 8.3454. The actual total shipping weight will be higher once you add the drum itself.