A volume to weight calculator converts liquid or solid volume into weight (mass) using material density. Select a material, enter volume, and get weight in kg, lbs, and grams.
Volume to weight conversion calculates the mass of a substance from its volume and density: Weight = Volume × Density.
This is essential for shipping (dimensional vs actual weight), cooking (converting cups to grams), construction (how much does 1 yd³ of concrete weigh?), and science (mass calculations from measured volumes).
The key insight: equal volumes of different materials have different weights. 1 liter of water = 1 kg, but 1 liter of honey = 1.42 kg, and 1 liter of mercury = 13.6 kg.
Weight = Volume × Density.
Example: How much does 5 gallons of water weigh?
5 gal × 3.785 L/gal × 1 kg/L = 18.93 kg = 41.7 lbs.
Example: How much does 1 cubic yard of gravel weigh?
1 yd³ = 0.7646 m³. Gravel density ≈ 1,680 kg/m³. Weight = 0.7646 × 1,680 = 1,284 kg ≈ 2,831 lbs.
Weight = 3.785 L × 1 kg/L = 3.785 kg = 8.345 lbs.
Volume = 236.59 mL. Flour ρ ≈ 0.593 g/mL. Weight ≈ 140 g = 4.9 oz.
ρ ≈ 0.91 g/mL. Weight = 910 g = 2.01 lbs.
ρ ≈ 2,400 kg/m³. Weight = 0.7646 × 2,400 = 1,835 kg ≈ 4,046 lbs ≈ 2 tons.
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Answers to common questions about the volume to weight calculator.
1 US gallon of water = 8.345 pounds = 3.785 kg. 1 Imperial gallon = 10 lbs = 4.546 kg. The Imperial gallon was literally defined as 10 lbs of water.
Flour has a density of ~0.593 g/mL. 1 US cup = 236.59 mL × 0.593 = ~140 grams. This varies by type: all-purpose ~125g, bread flour ~127g, cake flour ~114g, whole wheat ~120g.
Whole milk density ≈ 1.03 g/mL. 1 liter of milk ≈ 1,030 grams = 1.03 kg = 2.27 lbs. Slightly heavier than water due to dissolved solids.
For liquids: weight = volume × density. For dimensional weight (air freight): DIM weight (kg) = L × W × H (cm) ÷ 5,000. The carrier charges whichever is greater: actual weight or DIM weight.
No — only for water at 4°C (1 mL = 1 g). For all other materials, volume and weight differ. A liter of gasoline weighs only 750g, while a liter of mercury weighs 13,600g. Always multiply volume × density to get weight.