Density Converter: Convert Common Density Units Online
The Density Converter changes mass-per-volume measurements between units such as kg/m³, g/cm³, g/mL, kg/L, lb/ft³, lb/in³, lb/US gal, oz/in³, and slug/ft³. Water is approximately 1000 kg/m³, 1 g/cm³, or 1 g/mL. Imperial conversions use meter-based definitions of the pound and gallon; slug/ft³ uses the derived slug, defined as 14.5939 kg.
The Density Converter changes measurements of mass per unit volume between common metric and imperial units. Use it to convert values such as kg/m³, g/cm³, g/mL, kg/L, lb/ft³, lb/in³, lb/US gal, oz/in³, and slug/ft³. Water provides a useful reference: its density is approximately 1000 kg/m³, 1 g/cm³, or 1 g/mL.
To convert, enter a density value, choose its source unit, and select a target unit. The conversion uses the selected units' definitions; imperial units such as lb/ft³, lb/in³, and lb/US gal are exact via the meter-based definitions of the pound and gallon. The slug/ft³ conversion uses the derived slug, which is 14.5939 kg. You can also convert a set of values at once.
Density describes how much mass is contained in a given volume. Different fields and reference materials may express it with different mass and volume units, so converting makes figures easier to compare or use in calculations. Metric units such as kg/m³ and g/mL are common alternatives to imperial units such as lb/ft³ and oz/in³; the appropriate choice depends on the units used by your work or audience.
The Density Converter runs entirely in your browser, and your input is processed on your device rather than uploaded, stored, or sent to a server. Once the page has loaded, conversions continue to work offline without a server connection. The tool is free and does not require you to send your data anywhere to convert it.
This converter is useful for developers, engineers, students, and anyone checking or sharing density measurements across unit systems. It can help when reviewing material data, preparing figures for an audience that uses different units, or checking values without doing each conversion by hand.
Step 1: Enter the density value or set of values you want to convert. Check that the values use the source unit you plan to select.
Step 2: Choose the source unit for your measurement. Available units include metric and imperial options such as kg/m³, g/mL, lb/ft³, and slug/ft³.
Step 3: Choose the target unit you need. Match it to the units expected by your calculations, documentation, or audience.
Step 4: Read the converted figure and use it where needed. Converting a set of values at once can save you from calculating and rounding each value by hand.
Use case: Convert a density measurement when a material specification uses metric units but your calculations use imperial units, or the other way around.
Use case: Check a reported value in the unit your audience recognizes, such as converting kg/m³ to lb/ft³ for a different measurement convention.
Use case: Convert a set of density values at once instead of calculating and rounding each one by hand.
Use case: Compare a material's reported density with water's approximate value of 1000 kg/m³, 1 g/cm³, or 1 g/mL.
Use case: Review density figures that use different volume units, such as g/mL and kg/L, in a consistent target unit.
Use case: Check a value in slug/ft³ when working with measurements that use the derived slug as the mass unit.