Density Converter for Metric and Imperial Units
The Density Converter turns any density value into 14 other units instantly, so you can switch between kg/m³, g/cm³, lb/ft³, g/mL and more without doing the math by hand. Type a number, pick its unit, and every conversion updates as you go.
It is built for scientists, engineers, students, manufacturers, and anyone comparing material specifications across the metric and imperial systems. Whether you are checking a supplier sheet, sizing a 3D-printing filament, or working through a chemistry problem, the answers stay accurate and easy to read.
How to Convert Density Units
Enter a value
Type your density into the input field. Large numbers are formatted with thousand separators automatically so they stay easy to read.
Pick the source unit
Open the unit dropdown and choose your starting unit, or start typing a name like "gram" or "pound" to search the 14 available units.
Read the results
Every enabled unit updates instantly below, grouped into Metric and Imperial. Use the Decimals selector to show 2, 4, 6, 8 places or Auto.
Copy what you need
Click the copy button on any row for a single value, or use Copy All Results to grab every conversion at once for a report or spreadsheet.
Features
Instant Conversion
Results update in real time as you type — no button to press and no waiting, just enter a value and see every unit at once.
Smart Input Formatting
Large numbers are grouped with thousand separators so a value like 1 000 stays easy to read and verify.
Searchable Unit Selection
Type into the dropdown to filter the 14 available units by name and find the one you need in seconds.
Customizable Display
Use Customize Units to show only the units you work with — hide the imperial group if you only need metric, or vice versa.
Precision Control
Choose 2, 4, 6, or 8 decimal places, or Auto. Higher precision suits scientific work; lower keeps everyday results tidy.
One-Click Copy
Copy a single result with its row button or grab them all with Copy All Results, ready to paste into reports and spreadsheets.
Unit Reference Guide
A built-in reference panel lists each unit's symbol, name, and typical use — from chemistry (g/mL) to US construction (lb/ft³).
Bidirectional Input
Type in either the from or the to field and the other updates automatically, plus a swap button to flip the two units.
Works Everywhere
A fully responsive layout works on desktop, tablet, and phone — convert in the lab, the classroom, or on the factory floor.
Frequently Asked Questions
How do I convert kg/m³ to g/cm³?
Enter your value, set the source unit to kg/m³, and read the g/cm³ row in the results. The factor is 1000: 1 g/cm³ = 1000 kg/m³, so to convert kg/m³ to g/cm³ you divide by 1000.
What is the SI unit of density?
The SI unit of density is the kilogram per cubic meter (kg/m³). It is the standard in physics and engineering and the base unit this converter uses for all calculations.
What is the density of water in kg/m³?
Water has a density of about 1000 kg/m³ (or 1 g/cm³) at 4°C. The gram was originally defined so that one cubic centimeter of water weighs one gram, which makes water a handy reference point for comparing other materials.
What is the difference between kg/m³ and g/cm³?
Both measure mass per unit volume. kg/m³ is the SI standard, common in physics and engineering, while g/cm³ is favored in chemistry and materials science. They differ by a factor of 1000: 1 g/cm³ = 1000 kg/m³.
What is specific gravity, and how does it relate to density?
Specific gravity (relative density) is the ratio of a substance's density to water's density. Because water is 1 g/cm³, a material's specific gravity is numerically equal to its density in g/cm³ — so reading the g/cm³ result gives you the specific gravity directly.
How do US and UK gallon units differ?
A US gallon (about 3.785 L) and a UK gallon (about 4.546 L) have different volumes, so lb/gal (US) and lb/gal (UK) are not the same. The converter handles both — just pick the correct gallon type.
Does temperature affect density?
Yes. Most materials expand when heated, which lowers their density. This tool performs exact unit conversions but does not adjust for temperature, so make sure your measured density is taken at the correct reference temperature.
How accurate are the conversions?
Conversions use internationally recognized factors with high precision, suitable for scientific and engineering work. Set the Decimals selector to 8 (or Auto) when you need the most digits.
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