Unit Tools

Free Online Density Converter, kg/m3, g/cm3, lb/ft3 & g/ml

Convert kg per cubic metre to grams per cubic centimetre, pounds per cubic foot and more. Useful in engineering, shipping and cooking, where the same material is quoted in whichever unit that trade prefers. The exact factor is shown with every answer.

Answers As You Type Exact Factors Runs In Your Browser

Free Online Density Converter, kg/m3, g/cm3, lb/ft3 & g/ml

Water is the reference everything else is measured against. It sits almost exactly at 1,000 kg/m³, which is 1 g/cm³ and 1 g/mL. The same density, three ways of writing it. That makes it a quick sanity check: anything under 1 g/cm³ floats, anything over it sinks.

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🧱 Density Converter Base unit: Kilogram per cubic metre · 6 units

Every factor ships with the page. The sum runs in your browser and nothing is sent anywhere.

🧱 Convert density

Pick the two units, type a number, and the answer is already there.

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Amount

Result

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Common Density Conversions

Starting with water, because that is what everyone looks up.

Conversion	This	Equals
density of water in kg/m3	Water	1,000 kg/m³
density of water in g/cm3	Water	1 g/cm³
density of water in g/ml	Water	1 g/mL
density of water in lb/ft3	Water	62.43 lb/ft³
kg/m3 to lb/ft3	1 kg/m³	0.062428 lb/ft³
lb/ft3 to kg/m3	1 lb/ft³	16.0185 kg/m³
g/cm3 to kg/m3	1 g/cm³	1,000 kg/m³
g/cm3 to lb/ft3	1 g/cm³	62.428 lb/ft³
kg/L to kg/m3	1 kg/L	1,000 kg/m³
lb/in3 to kg/m3	1 lb/in³	27,679.9 kg/m³

How Dense Is That? Air to Gold

Your number next to things you already know.

Material	kg/m³	g/cm³	In water
Air (sea level)	1.2 kg/m³	0.0012 g/cm³	Lighter than everything below
Petrol	750 kg/m³	0.75 g/cm³	Floats on water, which is why spills spread
Ice	917 kg/m³	0.92 g/cm³	Floats, and that is unusual for a solid
Water (4 °C)	1,000 kg/m³	1.00 g/cm³	The reference point
Seawater	1,025 kg/m³	1.03 g/cm³	Denser, so you float more easily in it
Concrete	2,400 kg/m³	2.40 g/cm³	Sinks
Aluminium	2,700 kg/m³	2.70 g/cm³	Sinks, but light for a metal
Steel	7,850 kg/m³	7.85 g/cm³	Sinks. Ships float on shape, not density
Lead	11,340 kg/m³	11.34 g/cm³	Sinks fast
Gold	19,320 kg/m³	19.32 g/cm³	Nearly twice lead

These are typical values, not exact ones. Steel changes with its alloy, concrete with its mix, and wood varies inside a single tree. The unit conversions above are exact; these are for judging whether a figure is in the right ballpark.

How to Convert Density

Four steps, and not one of them needs a server.

Choose your two density units

kg/m³, g/cm³, g/mL, kg/L and the pound-based ones. All of them are in both lists.

Type the density

The density appears in the second box as you type. No convert button, and nothing leaves the device.

Compare it below

The materials chart on this page puts your figure next to water, steel, concrete and the rest.

Save the pairs you repeat

Save kg/m³ to g/cm³, lb/ft³ to kg/m³ or whichever pair you run daily, and pick recent figures back up from history.

Every Density Unit, and What It Equals

Every unit in this converter, relative to one kilogram per cubic metre.

Unit	1 unit equals
Kilogram per cubic metre (kg/m³)	1 kilogram per cubic metre (the base unit)
Gram per cubic centimetre (g/cm³)	1,000 kilogram per cubic metre
Gram per millilitre (g/mL)	1,000 kilogram per cubic metre
Kilogram per litre (kg/L)	1,000 kilogram per cubic metre
Pound per cubic foot (lb/ft³)	16.018463374 kilogram per cubic metre
Pound per cubic inch (lb/in³)	27679.9047102 kilogram per cubic metre

What This Converter Does

And what it will not quietly get wrong.

g/cm³ appears as you type

Type a figure in kg/m³ and the g/cm³ answer is already there, with lb/ft³ beside it.

Materials chart included

Air to gold, with water in the middle, so a number means something instead of just sitting there.

Exact unit conversions

These come from defined mass and volume units, so the conversions carry no error of their own.

Honest about materials

Steel varies with alloy and wood varies within one tree. Those figures are marked as typical, not exact.

Your usual density pairs

Keep kg/m³ to g/cm³, or lb/ft³ to kg/m³, one tap away, and pick any recent figure back up where you left it.

Keeps going offline

Every density factor ships with the page, so there is no account to make, nothing to upload and no server to call.

Frequently Asked Questions

What people actually ask about density.

1,000 kg/m³, which is the same as 1 g/cm³, 1 g/mL and 1 kg/L. In imperial units it is 62.43 lb/ft³. Water was chosen as the reference on purpose, which is why the metric figure is such a clean number.

Divide by 16.0185, or multiply by 0.062428. So concrete at 2,400 kg/m³ is about 150 lb/ft³. Going back, multiply lb/ft³ by 16.0185. Engineers in the US often call lb/ft³ "pcf", pounds per cubic foot, and it means the same thing.

Yes, exactly. A millilitre is defined as one cubic centimetre, so the two are identical. Chemistry tends to write g/mL for liquids and g/cm³ for solids, but the number never changes. Both are listed here because both appear in real documents.

Compare it with 1 g/cm³. Below that and it floats on water, above and it sinks. Petrol is 0.75, so it floats and spreads across the surface. Steel is 7.85, so it sinks. Ships are made of steel and still float, because a hull is mostly air and it is the whole ship’s average density that matters.

Because water is strange. Almost every substance gets denser as it freezes, but water expands, dropping from 1,000 to 917 kg/m³. That is why ice floats, why pipes burst in winter, and why lakes freeze from the top down instead of solid, which is rather important for the fish.

Density compared with water, written as a plain number with no units. Steel has a specific gravity of 7.85 because it is 7.85 times as dense as water. It is the same information as g/cm³, just without the units attached, which is why the two figures always look identical.

Yes, and for gases it changes a great deal. Warm things expand and get less dense. Water is at its densest at 4 °C and gets lighter both above and below that. The figures on this page assume ordinary room conditions, which is fine for everyday work but not for precise laboratory measurement.

No, and they cannot be. Steel changes with its alloy, concrete with its mix, and wood varies within a single tree. They are typical values, good for a sanity check and for picking the right ballpark. The unit conversions themselves are exact, because those come from defined units.

No. Every density factor is written into the page, so the kg/m³ arithmetic happens on your own machine. The figures you looked up and the pairs you saved stay in this browser on this device, and Settings clears them for good.