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Density calculator

Compute density from mass and volume (ρ = m / V).

Related tools

All Physics tools →
Buoyancy calculatorWill it float or sink? Archimedes' principle: the buoyant force equals the weight of the displaced fluid, F = ρ·V·g. From the fluid density, the object's volume and mass, it computes the buoyant force, the weight, the net force, the object's density, the float/sink verdict and — if it floats — the fraction that sits below the surface.Falling through the Earth calculator (gravity tunnel)Jump into a frictionless tunnel bored through the Earth — how long to reach the other side? For a uniform Earth the motion is simple harmonic, so any straight chord takes the same ~42 minutes one way, with a peak speed of ~7.9 km/s through the centre. Switch to the PREM density model for the realistic ~38-minute figure.Centripetal force calculatorCompute the centripetal force on an object moving in a circle (F = mv²/r).Escape velocity calculatorCompute the escape velocity of a body from its mass and radius.Force calculator (F = ma)Compute force from mass and acceleration using Newton's second law.Gravitational force calculatorCompute the gravitational attraction between two masses (Newton's law).Kinetic energy calculatorCompute kinetic energy from mass and velocity (½mv²).Momentum calculatorCompute momentum from mass and velocity (p = mv).

Need Density (g/cm³)? The Density calculator derives it from Mass (g), Volume (cm³) in one step. For instance, with Mass (g) = 200 and Volume (cm³) = 50 it returns Density (g/cm³) = 4.

How to use it

  1. Enter your values: Mass (g), Volume (cm³).
  2. Read the result instantly: Density (g/cm³).

Frequently asked questions

What does the Density calculator actually compute?

It takes Mass (g) and Volume (cm³) and derives Density (g/cm³) from them. The calculation is live as you type, so the result updates on every change.

What information do I need to provide?

2 values: Mass (g) and Volume (cm³). Nothing else is required — no account, no file upload.

Can you show a worked example?

With Mass (g) = 200 and Volume (cm³) = 50, the calculator returns Density (g/cm³) = 4. Those figures come from running this exact tool, so you can reproduce them by entering the same values.

What happens if I enter larger values?

It moves a lot. Using Mass (g) = 220 and Volume (cm³) = 100 instead, Density (g/cm³) goes from 4 to 2.2 — which is why it is worth testing a few scenarios rather than trusting a single figure.

What does it give for smaller values?

Scaled down to Mass (g) = 180 and Volume (cm³) = 25, Density (g/cm³) comes out at 7.2. The relationship is worth checking at both ends before you rely on a single result.

When would I actually use this?

Checking a homework answer, sizing something before building it, and getting an order of magnitude before committing to a design — a torque on a bolt, the force a spring returns, the frequency a circuit resonates at, how long light takes to arrive.

What is the most common mistake?

Feeding in a value in the wrong unit. Physics formulas assume SI throughout, so grams instead of kilograms or centimetres instead of metres shifts the answer by powers of ten without any warning.

What is the difference between the Density calculator and the Buoyancy calculator?

This one returns Density (g/cm³); the Buoyancy calculator returns Buoyant force (N) and Weight (N). That is the whole difference — open the one whose figure you need.

Is there a tool for the next step?

Falling through the Earth calculator (gravity tunnel) is the closest one after this: Jump into a frictionless tunnel bored through the Earth — how long to reach the other side? For a uniform Earth the motion is simple harmonic, so any straight chord takes the same ~42 minutes one way, with a peak speed of ~7.9 km/s through the centre. Switch to the PREM density model for the realistic ~38-minute figure.

What else is worth having open alongside it?

Centripetal force calculator and Escape velocity calculator — they come up in the same task often enough to be worth a second tab.

Further reading

All guides →
ExplainerHow Buoyancy Works: Archimedes' Principle, and Why Ice Floats With 10.5 % Above WaterThe upward force equals the weight of the fluid pushed aside. That one sentence decides whether something floats, and if it floats, exactly how much of it stays under.ExplainerWhat Is the Reynolds Number? The Formula, the Units That Cancel, and Why 2 300 Is Only for PipesRe = ρvL/μ compares inertia with viscosity, and the units really do cancel. See the number worked out for honey, a household pipe, an artery, a swimmer and a wing — and why the 2 300 threshold belongs to pipe flow alone.ExplainerHooke's Law Explained: F = kx, Real Spring Constants, and Where It Stops HoldingHooke's law says force is proportional to stretch — but only below the elastic limit. Here is F = kx with worked numbers, what a 200 N/m spring actually feels like, and how springs combine.ExplainerProjectile Motion Explained: Range, Height, Flight Time — and Why 45° Is Not Always BestThree formulas cover the whole of projectile motion on level ground. The catch is level ground: the moment launch and landing heights differ, the 45° result stops being true.ExplainerWhat Is Kinetic Energy? The KE = ½mv² Formula ExplainedKinetic energy is the energy of motion, given by KE = ½mv². Learn what the formula means, why speed matters most, and see worked examples in joules.ExplainerWhat Is Horsepower? Mechanical hp, Metric PS, and kWHorsepower measures the rate of doing work. Learn where the unit came from, how mechanical hp differs from metric PS/CV, and how both relate to kilowatts.