Calculate density, mass, or volume in seconds with clear formulas, unit conversions, and practical examples for science, school, and real-world measurement tasks.
This density calculator for mass and volume works in three modes, so you can solve for density, mass, or volume with the same tool. You only need two known values and a matching output unit.
Choose Density when you know mass and volume, Mass when you know density and volume, or Volume when you know mass and density.
Type your measurements, then select the unit for each input. The tool handles unit conversion for you, so grams, kilograms, pounds, liters, cubic centimeters, and cubic feet can all work together.
Click calculate to see the answer, the selected output unit, and a short formula summary. If the answer looks odd, check that you entered mass and volume in realistic units for the material.
Density is mass per unit volume, so the quality of your result depends on the quality of your measurements. If you measure a small object, use a scale and a container that give enough precision. A 1 gram error on a tiny sample can change the final answer more than you expect.
For irregular solids, find volume with water displacement. For liquids, use a graduated container. For gases, remember that temperature effect and pressure matter much more than they do for most solids and liquids.
Your answer tells you how tightly matter is packed into a space. Higher values usually mean a material is heavier for the same volume, while lower values mean it is lighter or more spread out.
A density result is easiest to understand when you compare it with a known benchmark. Fresh water is commonly rounded to 1 g/cm3 or 1000 kg/m3. If your sample is less dense than water, it may float in fresh water. If it is more dense, it will usually sink unless shape, trapped air, or buoyancy changes the situation.
The unit matters as much as the number. A lab worksheet may use grams per cubic centimeter, while engineering drawings often use kilograms per cubic meter. In U.S. customary units, builders and shipping teams often think in pounds per cubic foot. These values look very different on paper, but they can describe the same material after unit conversion.
Density can also help you spot measurement problems. Suppose a sample you believe is aluminum returns a result near 7.8 g/cm3. That is closer to steel than aluminum, so your mass, volume, or unit choice may be off. This is why density is useful for material density checks in classrooms, shops, labs, and manufacturing lines.
Below 1 g/cm3: often light woods, oils, foams, or materials with trapped air.
Around 1 g/cm3: many water-based liquids and biological materials.
2 to 3 g/cm3: many stone, ceramic, and light metal materials such as aluminum.
7 to 9 g/cm3: many common structural metals such as steel, brass, and copper.
Above 10 g/cm3: very dense metals such as lead, silver, mercury, and gold.
Real samples are not always pure. Moisture, air pockets, coatings, manufacturing tolerances, and mixed materials can change the average density. A piece of wood from one board may not match a textbook number exactly because grain pattern and moisture content vary.
Liquids and gases can shift even more because temperature and pressure directly affect volume. When you compare a result to a reference table, make sure the table uses similar conditions.
You can calculate density manually with one simple equation, then rearrange it to solve for mass or volume when needed.
The standard equation is D = m / V. Divide the object's mass by its volume, and the result is its density. If you already know density and volume, multiply them to find mass: m = D x V. If you know mass and density, divide mass by density to find volume: V = m / D.
The most important step is keeping units consistent. If mass is in grams and volume is in cubic centimeters, the result is in g/cm3. If mass is in kilograms and volume is in cubic meters, the result is in kg/m3. For U.S. customary units, pounds divided by cubic feet gives lb/ft3.
Here is a worked example using real numbers. Suppose you weigh an aluminum block and get 540 g. You measure its volume and get 200 cm3. Density equals 540 / 200 = 2.7 g/cm3. That answer matches the expected density of aluminum closely, which tells you the sample and measurements are believable.
You can check the reverse formulas too. If a concrete form holds 2.5 ft3 and the mix has an average density of 150 lb/ft3, the mass is 150 x 2.5 = 375 lb. If a liquid sample has a mass of 12 kg and a density of 800 kg/m3, the volume is 12 / 800 = 0.015 m3, which equals 15 liters.
1. Measure mass. Use a scale and write down the unit.
2. Measure volume. Use geometry for regular shapes or water displacement for irregular shapes.
3. Convert units if needed. Example: 1000 cm3 = 1 liter and 1728 in3 = 1 ft3.
4. Apply the formula. Divide, multiply, or rearrange depending on what you need.
5. Sanity-check the result. Compare it with a common material density value before you use it in a report, order, or lab write-up.
1 g/cm3 = 1000 kg/m3
1 liter = 1000 cm3
1 ft3 = 1728 in3
Density shows up in more places than most people expect. These examples show how the same formula helps with schoolwork, shipping, construction, liquids, and material identification.
You weigh a sample at 78.6 g and find a volume of 10 cm3. The density is 7.86 g/cm3. That is very close to iron or steel, so density gives you a strong clue about the material. Tip: dry the sample before measuring if it has been in water.
A product foam has a density of 2.2 lb/ft3, and a shipment uses 4.5 ft3 of that foam. Mass equals 2.2 x 4.5 = 9.9 lb. Tip: if packaging has voids, average bulk density can be more useful than pure material density.
Standard concrete is often near 150 lb/ft3. If a slab section contains 1.8 ft3 of concrete, the mass is about 270 lb. Tip: always confirm the mix design when structural load matters, because lightweight and heavy aggregate mixes can differ.
A syrup sample weighs 1.32 kg and fills exactly 1 liter. Its density is 1.32 kg/L. That is higher than water, which suggests a concentrated liquid. Tip: measure at a known temperature because warm liquids are often slightly less dense.
If a stored liquid weighs 64 lb and the measured density is 8 lb/gal, volume equals 64 / 8 = 8 gallons. Tip: this is useful when a scale gives you mass faster than a tank gauge gives you volume.
A rock weighs 265 g. Water in a graduated cylinder rises from 150 mL to 250 mL, so the rock volume is 100 cm3. Density is 265 / 100 = 2.65 g/cm3. Tip: this workflow is one of the simplest ways to calculate density for non-cubic objects.
One of the biggest content gaps on many calculator pages is a fast reference table. Use these values as starting points, then check a material datasheet when the job requires tight tolerances.
1.0 g/cm3
1000 kg/m3
2.70 g/cm3
2700 kg/m3
2.3 to 2.4 g/cm3
145 to 150 lb/ft3
7.85 g/cm3
7850 kg/m3
8.96 g/cm3
8960 kg/m3
19.3 g/cm3
19300 kg/m3
0.92 g/cm3
Floats in water
About 0.4 to 0.9 g/cm3
Varies by species and moisture
About 1.2 kg/m3 at sea level
Highly sensitive to temperature
These values are reference numbers, not guarantees. A material density entry can change because of alloy mix, temperature effect, trapped moisture, or porosity. For example, wood and concrete may vary more than polished metals because they often contain more internal variation.
If you work in a lab, manufacturing, or engineering setting, use the calculator to estimate the answer quickly and then compare it with a product specification. That combination is faster and more reliable than guessing from weight or appearance alone.
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Common questions about density calculations, unit conversion, and manual measurement.
Divide mass by volume. If a sample has a mass of 540 g and a volume of 200 cm3, its density is 2.7 g/cm3. Use matching units before you divide so the result is correct.
The density formula is rho = m / V, where rho is density, m is mass, and V is volume. You can rearrange it to m = rho x V and V = m / rho.
Common units include grams per cubic centimeter (g/cm3), kilograms per cubic meter (kg/m3), and pounds per cubic foot (lb/ft3). Solids are often listed in g/cm3, while engineering work may use kg/m3 or lb/ft3.
Measure the object's mass on a scale. Then find its volume by water displacement in a graduated cylinder. Subtract the starting water level from the ending level, and divide mass by that displaced volume.
Water expands or contracts as temperature changes, so its volume changes while its mass stays the same. Water reaches its maximum density near 4 degrees Celsius, which is why cold lakes freeze from the top down instead of solidifying from the bottom up.
Yes. Multiply density by volume. For example, concrete at 150 lb/ft3 filling 2 ft3 has a mass of 300 lb.
Yes. Divide mass by density. If a liquid weighs 12 kg and its density is 800 kg/m3, the volume is 0.015 m3, which is 15 liters.
Fresh water is often rounded to 1 g/cm3 or 1000 kg/m3 for everyday calculations. The exact value changes slightly with temperature and pressure, and pure water is densest near 4 degrees Celsius.
Density is mass per unit volume and always has units. Specific gravity is a ratio comparing a material's density to the density of water, so it has no units.