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

Mass to Volume Authority
Volume ↔ Weight Converter

Gallons to Pounds Calculator

Convert liquid volume in US gallons and Imperial gallons to mass in pounds (lbs) and kilograms (kg) with precision physical densities.

Quick Presets:
Formula Weight (lbs) = Volume (US Gal) × Density (kg/L) × 8.345404
Switch to Pounds → Gallons
gal
Quick:
Calculated Mass Weight Pure Water
83.454 lbs

10 US Gallons of Water weighs 83.454 Pounds (37.854 Kilograms).

Mass in KG 37.85 kg
Liters (L) 37.85 L
Total Ounces (oz) 1,335.3 oz
Short Tons 0.0417 tons
Drum Mass Scale 8.345 lb/gal
83.45 lbs
Weight per Gallon: 8.345 lbs / gal
Live Formula: Weight (lbs) = 10 gal × 8.3454 lb/gal = 83.454 lbs

Interactive Vehicle Fuel Tank Payload Weight Simulator

Fuel adds significant mass to cars, pickup trucks, motorhomes, and boats. A full 36-gallon pickup fuel tank weighs over 220 lbs, directly reducing cargo payload capacity and affecting vehicle center of gravity.

Gasoline Full Fuel Weight
93.26 lbs
@ 6.217 lb/gal (42.30 kg)
Diesel Full Fuel Weight
104.15 lbs
@ 6.943 lb/gal (47.24 kg)
Water Tank Payload
125.18 lbs
@ 8.345 lb/gal (56.78 kg)
⚓ Marine Hydrodynamics & Vessel Stability

Marine Boat Fuel & Ballast Tank Weight & Trim Simulator

On powerboats and offshore sailing yachts, liquid fuel (gasoline @ 6.22 lb/gal / marine diesel @ 7.10 lb/gal) and freshwater tanks (@ 8.34 lb/gal) significantly alter vessel center of gravity and hull trim. Calculate total added ballast weight and pitch moment.

gal
gal
Fuel Tank Weight
746.0 lbs
338.4 kg added weight
Water Tank Weight
333.8 lbs
151.4 kg added weight
Total Added Liquid Ballast
1,079.8 lbs
489.8 kg total ballast
Equivalent Crew Payload
~5.4 Adults
Based on 200 lb/adult standard
🌱 Agronomy & Liquid Nutrient Application

Liquid Fertilizer Spray Rate (lbs NPK per Gallon/Acre) Calculator

Liquid fertilizers (like UAN 32% nitrogen @ 11.08 lb/gal) are substantially heavier than water. Calculate gross product weight and exact pounds of active nutrient applied per acre.

GPA
Active Nutrient Rate per Acre
88.6 lbs N / acre
Direct crop nutrition
Gross Solution Weight per Acre
277.0 lbs / acre
125.6 kg per acre
Total Field Spray Volume
2,000 Gallons
7,571 Liters total
Total Fertilizer Batch Weight
22,160 lbs
10.05 Metric Tons

How Many Pounds Is 1, 5, 10, and 50 Gallons?

Standard weights in pounds (lbs) across water, fuels, oils, and foods.

Substance Density (kg/L) 1 Gallon (lbs) 5 Gallons (lbs) 10 Gallons (lbs) 50 Gallons (lbs)
💧 Pure Water 1.000 kg/L 8.345 lbs 41.727 lbs 83.454 lbs 417.270 lbs
🚚 Diesel Fuel #2 0.832 kg/L 6.943 lbs 34.717 lbs 69.434 lbs 347.169 lbs
⛽ Gasoline 0.745 kg/L 6.217 lbs 31.087 lbs 62.173 lbs 310.866 lbs
✈️ Jet A Aviation 0.804 kg/L 6.710 lbs 33.549 lbs 67.097 lbs 335.485 lbs
🥛 Whole Milk 1.030 kg/L 8.596 lbs 42.979 lbs 85.958 lbs 429.788 lbs
🫒 Olive Oil 0.918 kg/L 7.661 lbs 38.305 lbs 76.611 lbs 383.054 lbs
🔥 Liquid Propane 0.493 kg/L 4.114 lbs 20.571 lbs 41.143 lbs 205.714 lbs

Frequently Asked Questions

Everything you need to know about converting gallons to weight in pounds.

How do you convert gallons to pounds (lbs)?
To convert liquid volume in US gallons to weight in pounds, multiply the volume by the substance density in kg/L and by 8.345404 (the weight of 1 gallon of water):
Weight (lbs) = Volume (US Gal) × Density (kg/L) × 8.345404
For example, 10 US gallons of diesel (0.832 kg/L) weighs: 10 × 0.832 × 8.345404 = 69.43 lbs (31.49 kg).
How much does 1 gallon of water weigh in pounds?
One US liquid gallon of pure water weighs approximately 8.3454 pounds (3.7854 kg) at 4°C. At room temperature (20°C / 68°F), it weighs approximately 8.33 pounds.
How much does 1 gallon of gasoline weigh in pounds?
One US gallon of automotive gasoline weighs approximately 6.217 pounds (2.820 kg), assuming a standard gasoline density of 0.745 kg/L at 15°C.
How much does 1 gallon of diesel weigh in pounds?
One US gallon of standard #2 diesel fuel weighs approximately 6.943 pounds (3.149 kg), assuming a diesel density of 0.832 kg/L.
How much does 1 Imperial gallon weigh in pounds?
One British Imperial gallon of pure water weighs exactly 10.000 pounds (4.546 kg) at 62°F, by historical British Weights and Measures legal definition.