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

Mass to Volume Authority

Volume ↔ Mass Conversion Engine

Gallons to KG Calculator

Convert liquid and dry gallons (US & Imperial) into mass in kilograms and pounds with exact substance physical densities.

Quick Presets:
Inverse Formula Mass (kg) = Gallons × Density (kg/L) × 3.78541
Swap: KG → Gallons
gal
Quick:

Standard in US commerce for liquids, fuels, beverages.

kg/L
Calculated Mass Result Pure Water
37.854 kg

10 US Gallons of Water has a mass of 37.854 Kilograms (83.454 lbs).

Pounds (lbs) 83.45 lbs
Grams (g) 37,854 g
Ounces (oz) 1,335.3 oz
Metric Tons 0.0379 t
Tank Volume Visualizer 10.0 Gallons
37.85 kg
Equivalent Volume: 37.854 Liters
Substance Density: 1.0000 kg/L
Live Formula: Mass (kg) = 10 gal × 3.78541 L/gal × 1.0000 kg/L = 37.854 kg

Interactive Commercial Container & Cargo Payload Estimator

Logistics managers, freight forwarders, and chemical plants must calculate the total gross payload weight of standard liquid shipping containers. Select a container below to calculate filled net and gross weights.

Liquid Net Mass
18.93 kg
41.73 lbs
Container Tare Weight
2.50 lbs
1.13 kg
Total Gross Payload
44.23 lbs
20.06 kg gross
🚛 US DOT & Federal Bridge Formula Compliance

Tanker Truck Liquid Payload & Gross Weight (GVWR) Calculator

Federal highway regulations limit commercial semi-trucks to a maximum Gross Vehicle Weight Rating (GVWR) of 80,000 lbs (36,287 kg). Enter tanker capacity and fluid type to calculate liquid cargo mass and verify highway weight legal compliance.

gal
Liquid Cargo Mass
20,471 kg
45,131 lbs net cargo
Total Gross Highway Weight
76,131 lbs
34,532 kg gross
Highway Margin Below 80k Limit
+3,869 lbs
Available legal payload reserve
DOT Legal Status
🏢 Warehouse Structural Engineering

IBC Tote Warehouse Floor Load Pressure & Stacking Safety

Standard industrial concrete warehouse floor slabs are typically rated for 250 to 500 lbs/sq ft (PSF). Calculate floor contact pressure for multi-tier stacking of 275-gallon and 330-gallon Intermediate Bulk Containers.

Single Tote Gross Mass
1,099.9 kg
2,425 lbs per tote
Total Stack Column Weight
4,850 lbs
2,200 kg total
Floor Contact Pressure (PSF)
364.7 PSF
17.5 kPa (kN/m²)
Concrete Slab Safety Status
✅ Within 400 PSF Industrial Limit

Weights of 1, 5, 10, and 50 Gallons Across Common Substances

Because density governs the conversion from volume to mass, liquids with lower density (like gasoline and propane) weigh significantly less per gallon than water or heavy oils.

Substance Density 1 US Gal (kg / lbs) 5 US Gal (kg / lbs) 10 US Gal (kg / lbs) 50 US Gal (kg / lbs)
💧 Pure Water 1.000 kg/L 3.785 kg (8.34 lbs) 18.93 kg (41.73 lbs) 37.85 kg (83.45 lbs) 189.27 kg (417.27 lbs)
🥛 Whole Milk 1.030 kg/L 3.899 kg (8.60 lbs) 19.49 kg (42.98 lbs) 38.99 kg (85.96 lbs) 194.95 kg (429.79 lbs)
🚚 Diesel Fuel #2 0.832 kg/L 3.149 kg (6.94 lbs) 15.75 kg (34.72 lbs) 31.49 kg (69.43 lbs) 157.47 kg (347.17 lbs)
⛽ Gasoline 0.745 kg/L 2.820 kg (6.22 lbs) 14.10 kg (31.09 lbs) 28.20 kg (62.17 lbs) 141.01 kg (310.87 lbs)
✈️ Jet A Aviation 0.804 kg/L 3.043 kg (6.71 lbs) 15.22 kg (33.55 lbs) 30.43 kg (67.10 lbs) 152.17 kg (335.49 lbs)
🫒 Olive Oil 0.918 kg/L 3.475 kg (7.66 lbs) 17.38 kg (38.31 lbs) 34.75 kg (76.61 lbs) 173.75 kg (383.06 lbs)
🍯 Pure Honey 1.420 kg/L 5.375 kg (11.85 lbs) 26.88 kg (59.25 lbs) 53.75 kg (118.51 lbs) 268.76 kg (592.53 lbs)
🔥 Liquid Propane 0.493 kg/L 1.866 kg (4.11 lbs) 9.33 kg (20.57 lbs) 18.66 kg (41.14 lbs) 93.31 kg (205.71 lbs)

Frequently Asked Questions

Engineering and everyday guidance for converting gallons to mass in kg.

How do you convert gallons to kilograms?
To convert volume in gallons to mass in kilograms, multiply the volume by the liter factor (3.785411784 for US liquid gallons or 4.54609 for Imperial gallons) and then multiply by the material density in kg/L:
Mass (kg) = Gallons × Density (kg/L) × Gallon_Factor
For example, 10 US gallons of diesel (0.832 kg/L) = 10 × 0.832 × 3.78541 = 31.49 kg (69.43 lbs).
How many kg is 1 gallon of water?
One US liquid gallon of pure water has a mass of approximately 3.78541 kilograms (8.3454 lbs). One Imperial gallon of water has a mass of exactly 4.54609 kilograms (10.00 lbs) by historical British definition.
How many kg is 1 gallon of diesel fuel?
One US gallon of standard #2 diesel fuel weighs approximately 3.149 kilograms (6.943 lbs), assuming a diesel density of 0.832 kg/L at 15°C.
How many kg is 1 gallon of gasoline?
One US gallon of automotive gasoline weighs approximately 2.820 kilograms (6.217 lbs), assuming a gasoline density of 0.745 kg/L at 15°C.
How many kg is 1 gallon of milk?
One US gallon of whole cow's milk weighs approximately 3.899 kilograms (8.596 lbs), assuming a standard milk density of 1.030 kg/L.
How many kg is 1 gallon of propane?
One US gallon of liquid propane weighs approximately 1.866 kilograms (4.114 to 4.20 lbs), assuming a density of 0.493 kg/L at 60°F.