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Mass Calculator: Density, Volume & Weight

This calculator estimates mass from density and volume using m=ρVm=\rho V. Search Material Selection for preset densities or enter your own, type volume directly or derive it from cylinder, sphere, cube, or rectangular dimensions, then read mass in kilograms (kg), grams, pounds, and ounces plus Earth weight in newtons (N) and pound-force (lbf). The Information hub compares weight on the Moon, Mars, and Jupiter. Assumes uniform density; not for certified trade weighing.

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

Mass in kilograms is density (kilograms per cubic meter) times volume (cubic meters). The Results panel uses the same product; weight in newtons (N) and pound-force (lbf) applies Earth gravity 9.80665 m/s² to that mass.

Enter density and volume above to see live arithmetic here.

Weight on other worlds

Enter density and volume in the main form. Moon, Mars, and Jupiter weights appear here in newtons (N).

Material density

Enter density and volume in the main form to see comparisons here.

Quick notes

At high altitude, gravity is slightly weaker, so weight drops a little while mass stays the same.

Density varies with temperature. Water is densest near 4°C; most liquids expand when heated.

Jupiter surface gravity is about 2.5× Earth. A 70 kg object would weigh about 1,735 N there (versus about 687 N in the Earth weight row for the same mass).

How to use this calculator

Set Settings decimal places, fill Material Selection or Density (ρ), then enter volume or turn on Calculate volume by shape. Read Total mass and Weight on Earth on the Results card; planetary weights and density comparisons update in the Information hub as you type.

Reading your mass result

Match decimal places in Settings before copying numbers. The first example walks water at 1 m³; the second uses shape mode for a steel cylinder.

Example: Water, 1 m³ → 1000 kg

Search Water (density 1000 kg/m³). Leave Calculate volume by shape off; type volume 1 with unit cubic meter [m³]. Total mass 1000 kg; Weight on Earth about 9806.65 N and 2204.62 lbf. The Information hub lists Moon 1620 N, Mars 3710 N, Jupiter 24,790 N for that mass.

Example: Steel cylinder by shape

Select Steel (7850 kg/m³). Turn on Calculate volume by shape, choose cylinder, units m, radius 0.5, height 1. Volume about 0.7854 m³ → mass about 6,165.376 kg. Material density in the hub shows about 7.85× water.

Mass calculator: density × volume and Earth weight

This page multiplies density by volume (or shape dimensions) to estimate mass and Earth weight. Assumes uniform density; not for certified weighing.

What this calculator does

The widget computes mass from density ρ and volume V using m=ρVm=\rho V. Material Selection presets fill density; volume can be typed or derived from cylinder, sphere, cube, or rectangular dimensions. The Results card shows mass in kg, g, metric tons, lb, and oz plus Earth weight in newtons (N) and pound-force (lbf). The Information hub adds Moon, Mars, and Jupiter weights and density comparisons when inputs are set.
  • Limits:
    Uniform density only; no buoyancy or temperature correction. Does not solve for unknown density or volume.

How the math works

Inputs convert to kg/m³ and m³ internally. Earth weight in newtons (N) is mass × 9.80665 m/s²; pound-force (lbf) uses mass × 2.20462 (equivalent to weight on Earth for kilogram-mass units).
m=ρVm=\rho V
Shape volumes: cylinder V=πr2hV=\pi r^2 h, sphere V=43πr3V=\tfrac{4}{3}\pi r^3, cube side³, rectangular length × width × height. Planetary weights multiply the same mass by Moon 1.62, Mars 3.71, or Jupiter 24.79 m/s².

Limits

Material presets are illustrative. Very large or small values may display in scientific notation. Educational reference only; not for trade-certified weighing or aerospace mass properties.

Mass Calculator FAQ

How do I calculate mass from density and volume?

Mass equals density times volume: m=ρVm=\rho V. Search Water in Material Selection (fills 1000 kg/m³), enter volume 1 m³ → total mass 1000 kg on the Results card.

What units does the results panel show?

The dark Results card lists mass in kilograms (kg), grams (g), metric tons, pounds (lb), and ounces (oz). Weight on Earth adds newtons (N) and pound-force (lbf) using standard gravity 9.80665 m/s². Decimal places follow the Settings dropdown (default 4).

How does Calculate volume by shape work?

Turn on the checkbox, pick cylinder, sphere, cube, or rectangular, and enter dimensions in meters or centimeters. Cylinder volume is V=πr2hV=\pi r^2 h. Example: Steel (7850 kg/m³), cylinder r = 0.5 m, h = 1 m → volume about 0.7854 m³ and mass about 6,165.376 kg at default decimal places.

What is the difference between mass and weight on this page?

The Results card shows Total mass (kg, g, lb, oz) separately from Weight on Earth (N and lbf). Mass is the amount of matter; weight is gravitational force on that mass. A 70 kg object reads about 687 N or 154 lbf here; the same mass weighs less on the Moon and more on Jupiter.

What planetary gravity values does the Information hub use?

Moon 1.62 m/s², Mars 3.71 m/s², Jupiter 24.79 m/s². Each listed weight is your current mass estimate times that surface gravity, in newtons (N).

Can I override the material density?

Yes. Pick a preset to fill density, then edit the Density (ρ) field or change units. Preset values are typical room-temperature references, not certified lab measurements.

What assumptions does the calculator make?

Uniform density throughout the object, no buoyancy, and Earth weight at constant 9.80665 m/s². It does not solve for density or volume when those are unknown.

How is this different from the density or volume calculators?

This page always solves for mass from density and volume (or shape dimensions). The density calculator can solve for any one of density, mass, or volume when you know the other two. The volume calculator focuses on geometric volume without a material library.

Sources & citations

References used for the calculation method and definitions. Links open in a new tab when available.

[1]
NIST Guide for the Use of the International System of Units (SI)

SI base units for mass, volume, and density conventions used in unit conversion.

[2]
NASA Planetary Fact Sheet: gravity comparison

Surface gravity values for Moon, Mars, Jupiter, and other bodies used in planetary weight estimates.

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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