Home › Unit Conversion › Density Converter

Density Converter

Converts density between kg/m³, g/cm³, g/mL, kg/L, g/L, mg/L, lb/ft³, lb/in³, oz/in³ and lb per US gallon using exact mass and volume definitions (1 lb/ft³ = 16.01846337 kg/m³).

ValueAmount to convert, expressed in from_unit. From unitUnit of the input value. Accepted symbols: kg/m3, g/cm3, g/mL, g/L, mg/L, kg/L, lb/ft3, lb/in3, oz/in3, lb/gal_us; spelled-out names and common abbreviations are accepted too. To unitUnit to convert into (same symbols as from_unit).

When to use

You need a material or fluid density in another unit, e.g. g/cm³ to kg/m³, kg/m³ to lb/ft³ or g/mL to lb/gal.

Do not use when: You need to compute density from mass and volume (a physics calculation, not a unit conversion) or concentration in mol/L (use molarity).

Formula

result = value × factor, factor = (1 from_unit in kg/m3) / (1 to_unit in kg/m3)

Water at 4 °C has a density of about 1 g/cm³ = 1000 kg/m³ = 62.428 lb/ft³ = 8.345 lb/US gal; specific gravity is density divided by that of water.

Inputs

Parameter	Type	Required	Description
`value`	number	yes	Amount to convert, expressed in from_unit.
`from_unit`	enum: kg/m3 \| g/cm3 \| g/mL \| g/L \| mg/L \| kg/L \| lb/ft3 \| lb/in3 \| oz/in3 \| lb/gal_us	yes	Unit of the input value. Accepted symbols: kg/m3, g/cm3, g/mL, g/L, mg/L, kg/L, lb/ft3, lb/in3, oz/in3, lb/gal_us; spelled-out names and common abbreviations are accepted too.
`to_unit`	enum: kg/m3 \| g/cm3 \| g/mL \| g/L \| mg/L \| kg/L \| lb/ft3 \| lb/in3 \| oz/in3 \| lb/gal_us	yes	Unit to convert into (same symbols as from_unit).

Outputs

Output	Type	Description
`result`	number	Converted value expressed in to_unit (rounded to 6 decimals; see result_text for very small or very large values).
`result_text`	string	The conversion as text with 6 significant figures, e.g. "5 mi = 8.04672 km".
`formula`	string	Relation used, e.g. "1 mi = 1.609344 km".
`factor`	number	Multiplier from from_unit to to_unit (result = value × factor); absent for non-linear conversions.
`conversion_table`	object	The input value expressed in every supported density unit (6 significant figures), keyed by unit symbol.

Example

1 g/cm³ (water) to lb/ft³: {"value":1,"from_unit":"g/cm3","to_unit":"lb/ft3"} → {"result":62.427961,"formula":"1 g/cm³ = 62.42796058 lb/ft³","conversion_table":{"kg/m3":1000,"lb/gal_us":8.3454,"lb/in3":0.0361273}}

7850 kg/m³ (steel) to lb/ft³: {"value":7850,"from_unit":"kg/m3","to_unit":"lb/ft3"} → {"result":490.059491,"conversion_table":{"g/cm3":7.85,"lb/in3":0.283599}}

GET https://tttkmbb.com/api/v1/calculate/density?value=1&from_unit=g%2Fcm3&to_unit=lb%2Fft3

Machine access

API: GET https://tttkmbb.com/api/v1/calculate/density (query parameters) or POST with a JSON body {"inputs": {...}}
Schema: https://tttkmbb.com/api/v1/calculators/density · Markdown: https://tttkmbb.com/conversion/density.md · JSON definition: https://tttkmbb.com/conversion/density.json
MCP: server https://tttkmbb.com/mcp, tool run_calculator with calculator_id="density"
OpenAPI operationId: convert_density
Freshness: static. Authentication: none. Rate limit: fair use (see rate limits).

Sources

FAQ

Are g/cm³, g/mL and kg/L the same?

Yes, all three equal 1000 kg/m³ exactly because 1 mL = 1 cm³ and 1 L = 1 dm³.

How do I convert a weight to a volume?

Divide mass by density: volume = mass / density (e.g. 5 kg of water ÷ 1 kg/L = 5 L). Convert the units first so mass, volume and density agree.

Related calculators

Mass / Weight Converter — Mass units used in density.
Volume Converter — Volume units used in density.
Molarity Calculator — Molar concentration instead of mass density.