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Science & lab

Mass Calculator: Density, Volume & Weight

Calculate mass from density and volume. Searchable materials. Volume by shape.

By Jeff Beem

Updated

Settings

Material Selection

Select a material to auto-fill density, or enter density manually.

Density (ρ)

Volume (V)

Results

Select material or enter density and volume

Information hub

The core formula

1 unit volume×Density=Resulting mass

Weight on other worlds

Enter density & volume to see weights.

Material quick-facts

Select a material or enter density.

Weight vs mass

Mass (kg, g) is the amount of matter, it stays the same everywhere. Weight (N, lbf) is the force of gravity on that mass. Same mass, different gravity: different weight.

Mass from Density & Volume

Multiply density by volume to get mass. Use the searchable material list to grab a density, or enter your own. You can either type a volume directly or let the calculator derive it from a shape, cylinder, sphere, cube, or box.

Core Concepts

The Formula

m=ρ×Vm = \rho \times V. Density (ρ) is fixed for a material; volume depends on size. Multiply them to get mass.

Material Library

Type to search water, steel, gold, aluminum, and more. Selecting one fills in density. Override it if your value differs.

Volume by Shape

Toggle "Calculate Volume by Shape" to enter dimensions. Cylinder: πr2h\pi r^2 h. Sphere: 43πr3\frac{4}{3}\pi r^3. Cube: side³. Box: L × W × H.

Weight on Earth

Weight = mass × g (g ≈ 9.81 m/s²). Results show Newtons and pound-force so you can compare with scales or lab work.

Mass Calculator: Density, Volume & Weight

Find mass from density and volume, or from shape dimensions. Searchable materials. Volume formulas for cylinder, sphere, cube, and rectangular prism. Results in kg, g, lb, oz, plus weight in N and lbf. No sign-up.

What This Calculator Does

This mass calculator finds the mass of an object from its density and volume using the fundamental relationship m=ρ×Vm = \rho \times V. Select a material from the built-in library to auto-fill density, or enter a custom value. You can type volume directly or toggle "Calculate Volume by Shape" to enter dimensions for a cylinder, sphere, cube, or rectangular prism. Results appear in kg, g, lb, and oz, with weight shown in Newtons and pound-force.
  • What You'll Get:
    Mass in multiple units (kg, g, lb, oz), weight in Newtons and pound-force on Earth, and planetary weight comparisons for the Moon, Mars, and Jupiter in the Information Hub.
  • Who It's For:
    Students solving physics problems, engineers estimating material weight, makers and builders calculating how much a piece of metal or concrete weighs, and anyone who needs quick density-to-mass conversion.
  • Scope & Limits:
    Assumes uniform density throughout the object. The material library covers common metals, liquids, woods, and building materials. Custom density values are supported for any material not in the list.

How to Use This Calculator

Select a material from the searchable library (water, steel, gold, aluminum, and more) to auto-fill density, or enter a custom density value. Then provide volume directly in your preferred unit, or toggle "Calculate Volume by Shape" and enter dimensions for a cylinder (πr2h\pi r^2 h), sphere (43πr3\frac{4}{3}\pi r^3), cube (side³), or rectangular prism (L × W × H). The calculator multiplies density by volume to produce mass and weight.
  • Material Library:
    Type to search common materials (metals, liquids, woods, plastics). Selecting one fills density automatically. Override the value if your specific material differs.
  • Volume Input:
    Enter volume directly in cm³, m³, liters, or gallons. Or toggle "Calculate Volume by Shape" to enter radius and height (cylinder), radius (sphere), side length (cube), or L × W × H (rectangular prism).
  • Mass Results:
    The calculated mass appears in kg, g, lb, and oz. Weight is also shown in Newtons (N) and pound-force (lbf) using Earth\'s gravity (g ≈ 9.81 m/s²).
  • Planetary Weights:
    The Information Hub displays what the same mass would weigh on the Moon (~1/6 g), Mars (~0.38 g), and Jupiter (~2.5 g).

How to Calculate Mass from Density and Volume

Mass is density times volume: m=ρ×Vm = \rho \times V. Water at 1000 kg/m³ in one cubic meter gives 1000 kg of mass. Gold at 19,300 kg/m³ in the same volume gives 19.3 tonnes. The searchable material library lets you pick water, steel, aluminum, or dozens of others to auto-fill density. You can still edit it. Volume can be entered directly in cm³, m³, liters, or gallons, or computed from shape dimensions.

Volume by Shape: Cylinder, Sphere, Cube, Prism

Turn on "Calculate Volume by Shape" to enter dimensions instead of volume. Cylinder: V=πr2hV = \pi r^2 h. Sphere: V=43πr3V = \frac{4}{3}\pi r^3. Cube: side³. Rectangular prism: length × width × height. Use meters or centimeters; the calculator converts and multiplies by density to get mass.

Weight vs Mass and Weight on Other Planets

Mass is the amount of matter; weight is the force of gravity on it. On Earth, weight in Newtons is mass × 9.81; in pound-force it is roughly mass (kg) × 2.2. The same mass has different weights elsewhere: on the Moon about one-sixth of Earth, on Mars about 38%, on Jupiter about 2.5×. The Information Hub shows your mass converted to weight (N) on the Moon, Mars, and Jupiter.

Mass Calculator FAQ

How do I calculate mass from density and volume?

Use the formula m=ρ×Vm = \rho \times V. For water (1000 kg/m³) in a 0.5 m³ container, that's 500 kg. Pick a material from the dropdown to auto-fill density, or type it in yourself.

What is the formula for volume of a cylinder?

Cylinder volume uses V=πr2hV = \pi r^2 h, radius squared times height. Turn on "Calculate Volume by Shape," choose Cylinder, then plug in r and h. The tool multiplies that by density to get mass.

What is the difference between weight and mass?

Mass is how much matter you have (kg or lb); it stays the same everywhere. Weight is the pull of gravity on that mass. On Earth, a 70 kg person weighs about 687 N or 154 lbf. Same person on the Moon: same mass, but roughly one-sixth the weight.

How do I find the weight on Mars or Jupiter?

Weight = mass × local gravity. Mars has about 0.38× Earth's g, Jupiter about 2.5×. Enter density and volume to get mass, then the Information Hub shows what that mass would "weigh" in Newtons on the Moon, Mars, and Jupiter.

Science & Lab Reference Note

Educational Use: These tools use standard scientific formulas and accepted constants. Results are intended for learning, homework, and general reference, not for regulated lab work, industrial processes, or clinical applications.

Verification Recommended: Real-world conditions (purity, temperature, pressure, humidity) affect outcomes. For research, manufacturing, or safety-critical work, confirm with a qualified professional or calibrated lab equipment.

Not Professional Advice: This site does not provide chemical, medical, or engineering advice. All calculations run locally in your browser; no data is stored or transmitted.

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