Convert volume to mass using material density. Supports 30+ materials, 5 shape modes, and multiple unit systems with weight comparison tables.
The Volume to Mass Calculator converts any volume of material to its mass using the formula m = ρ × V. Select from 30+ built-in materials — from air and water to gold and platinum — or enter a custom density. The tool supports direct volume entry in 8 units plus shape-based volume computation for boxes, cylinders, spheres, and cones.
This calculator answers the most practical physics question: "How much does this weigh?" Whether you need to know the weight of a concrete slab for structural loading, the mass of fuel in a tank, the weight of a metal part for shipping, or how many grams of mercury fill a thermometer, this tool gives you the answer in kilograms, grams, pounds, and Newtons simultaneously.
The built-in material database eliminates the need to look up density values separately. Simply select your material, enter the volume or dimensions, and get the mass. The comparison table shows mass for every material at your volume, making it easy to compare alternatives or verify that the calculated weight makes physical sense.
This is the most common density calculation in everyday life: you know a container\'s volume and need to know what it weighs when full of a specific material. Builders estimate concrete pours, shippers calculate parcel weights, cooks convert recipe volumes to mass, and engineers size lifting equipment — all using m = ρV.
With 30+ built-in materials and 5 volume input modes, this calculator handles virtually any volume-to-mass problem without separate density lookups or unit conversions.
Mass: m = ρ × V, where ρ = density (kg/m³), V = volume (m³). Weight (force): W = m × g, where g = 9.81 m/s² (Earth). Box volume: V = L × W × H. Cylinder volume: V = π(d/2)²h. Sphere volume: V = (4/3)π(d/2)³. Cone volume: V = (1/3)π(d/2)²h. Unit conversions applied automatically.
Result: Mass = 1.000 kg, Weight = 9.81 N, 2.205 lb
One liter of water has a density of 1,000 kg/m³, giving a mass of exactly 1.000 kg. This is by design — the kilogram was originally defined as the mass of one liter of water at 4°C.
We convert volume to mass constantly without thinking about it. A gallon of milk weighs 8.6 lb. A cubic yard of concrete weighs about 3,600 lb. A full scuba tank of compressed air weighs 2.5 kg more than an empty one. These conversions all depend on density, and knowing exact values prevents overloading vehicles, under-specifying structures, and mismeasuring ingredients.
Different industries prefer different units: chefs use fluid ounces and cups, chemists use milliliters and grams, engineers use cubic meters and kilograms, and American builders use cubic yards and pounds. This calculator handles all conversions seamlessly. Note that fluid ounces (volume) and ounces (mass) are only equivalent for water — for denser or lighter liquids, they diverge significantly.
Accurate weight estimation is critical in construction (crane load planning, structural design), logistics (container and truck loading), manufacturing (raw material ordering), and process engineering (vessel and piping design). For complex shapes, engineers decompose structures into boxes, cylinders, and other primitives, calculate each mass separately, then sum them. This calculator\'s shape modes support exactly this workflow.
Volume alone doesn\'t determine mass — one liter of water weighs 1 kg but one liter of mercury weighs 13.5 kg. Density (mass per unit volume) bridges the gap between volume and mass.
Mass (kg) measures the amount of matter and is constant everywhere. Weight (Newtons) is the gravitational force on that mass: W = mg. On Earth, 1 kg weighs 9.81 N; on the Moon, only 1.62 N.
Multiply liters by the density in kg/L. For water: 1 L × 1.0 kg/L = 1.0 kg. For milk: 1 L × 1.03 kg/L = 1.03 kg. For gasoline: 1 L × 0.75 kg/L = 0.75 kg.
Yes. Materials expand when heated, reducing density. Water ranges from 999.84 kg/m³ at 0°C to 958.4 kg/m³ at 100°C. For precision work, use density at the actual temperature.
For homogeneous mixtures, use the mixture\'s density. For composites with known volume fractions, compute effective density as ρ_eff = Σ(fᵢρᵢ). Enter this as a custom density.
The values are typical room-temperature densities for pure materials. Real-world density varies with temperature, composition, and processing. For engineering calculations, verify against material data sheets.