NIST & ASTM Calibrated
Ref: H₂O @ 4°C = 1.0000 kg/L Density Library
kg to Gallons LAB

Mass to Volume Authority
Imperial Weight ↔ Volume Converter

Pounds to Gallons Calculator

Convert imperial mass in pounds (lbs) to US liquid gallons, UK Imperial gallons, and liters with precision physical densities.

Quick Presets:
Formula US Gallons = Pounds ÷ (Density in kg/L × 8.345404)
Switch to Gallons → Pounds
lbs
Quick:
Calculated Liquid Volume Pure Water
11.983 US Gallons

100 lbs of Water occupies 11.983 US Gallons (45.359 Liters).

Liters (L) 45.36 L
UK Imp Gallons 9.978 gal
Mass in KG 45.36 kg
Fluid Ounces 1,533.8 oz
Tank Volume Visualizer 8.345 lb/gal
11.98 gal
Fluid Mass Basis: 100.00 lbs
Live Formula: US Gallons = 100 lbs ÷ 8.3454 lb/gal = 11.983 US gal

Interactive "A Pint's a Pound" Rule-of-Thumb Testing Simulator

The traditional proverb "A pint's a pound the world around" is only approximately true for pure water (1 US liquid pint of water = 1.043 lbs). For non-water liquids, this rule fails drastically due to density differences. Test 1 pint across 6 fluids below:

1 US Liquid Pint Actual Mass
1.043 lbs
473.2 grams
Error vs "A Pint's a Pound"
+4.3% Error
Rule of thumb variance
Substance Density
1.000 kg/L
8.345 lb / US gallon
🏊 Commercial & Residential Pool Maintenance

Pool Chemical Dosing & Liquid Chlorine Feeder Calculator

Pool chemical treatment labels often specify shock treatments in dry pounds (lbs), but commercial liquid shock (sodium hypochlorite) is sold in gallons. Calculate the exact liquid gallons needed to match target dry chemical poundage.

gal
Liquid Volume Needed
4.00 US Gal
15.14 Liters
Liquid Jugs (1-Gal Size)
4 Jugs
Round up for purchase
Total Liquid Dose Weight
40.0 lbs
18.14 kg bulk liquid
Estimated PPM Change
+4.0 ppm
In 15,000 Gallon Pool
🎨 Architectural & Industrial Coatings

Paint & Coating Weight-to-Volume & Square Foot Coverage Estimator

Heavy industrial coatings, primers, and latex paints weigh between 10.0 and 14.5 lbs per gallon due to dense titanium dioxide and pigment solids. Calculate how many gallons of paint are in a given weight batch and estimate wall square footage coverage.

lbs
Paint Volume Yield
4.46 US Gal
16.90 Liters
Estimated Wall Coverage
781 sq ft
72.6 m² surface area
Standard 5-Gal Pail Ratio
89.3% Pail
~0.89 of a 5-gallon bucket
Density Specification
11.20 lb/gal
1.342 kg/L specific gravity

How Many Gallons Is 10, 50, 100, and 500 Pounds?

Liquid volume in US gallons calculated across fuels, water, oils, and chemicals.

Substance Weight / US Gal 10 lbs (US Gal) 50 lbs (US Gal) 100 lbs (US Gal) 500 lbs (US Gal)
💧 Pure Water 8.345 lb/gal 1.20 gal 5.99 gal 11.98 gal 59.91 gal
⛽ Gasoline 6.217 lb/gal 1.61 gal 8.04 gal 16.08 gal 80.42 gal
🚚 Diesel Fuel #2 6.943 lb/gal 1.44 gal 7.20 gal 14.40 gal 72.01 gal
✈️ Jet A Aviation 6.710 lb/gal 1.49 gal 7.45 gal 14.90 gal 74.52 gal
🥛 Whole Milk 8.596 lb/gal 1.16 gal 5.82 gal 11.63 gal 58.17 gal
🫒 Olive Oil 7.661 lb/gal 1.31 gal 6.53 gal 13.05 gal 65.27 gal
🔥 Liquid Propane 4.114 lb/gal 2.43 gal 12.15 gal 24.31 gal 121.54 gal

Frequently Asked Questions

Everyday guidance on converting pounds to liquid volume in gallons.

How do you convert pounds (lbs) to gallons?
To convert pounds (mass) to US gallons (volume), convert pounds to kilograms (divide by 2.20462), then divide by density (kg/L) and 3.78541:
US Gallons = Weight (lbs) ÷ (Density in kg/L × 8.345404)
For pure water (density = 1.000 kg/L = 8.345 lb/gal), 10 lbs equals approximately 1.198 US Gallons.
How many gallons is 100 lbs of diesel fuel?
Standard #2 diesel fuel weighs approximately 6.943 lbs per US gallon (density = 0.832 kg/L). Therefore: 100 lbs ÷ 6.943 = 14.40 US Gallons (or 54.52 Liters).
How many gallons is 100 lbs of gasoline?
Automotive gasoline weighs approximately 6.217 lbs per US gallon (density = 0.745 kg/L). Therefore: 100 lbs ÷ 6.217 = 16.08 US Gallons (or 60.89 Liters).
Why is fuel measured in pounds for aviation?
Airlines and flight dispatchers calculate fuel loads in pounds (or kilograms) rather than gallons because jet engine thrust output and aircraft weight & balance depend strictly on the mass of fuel energy. Because jet fuel expands and contracts with ambient altitude and temperature, a gallon in Phoenix weighs less than a gallon in Minneapolis, but 10,000 lbs delivers identical energy.