Density
Convert mass density units: kg/m³, g/cm³ and lb/ft³. Important for chemistry and materials science.
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Conversão de Tamanhos
Categoria
Density
Comprovante de Conversão
De
kgm3
Para
---
gcm3
Os resultados são baseados em tabelas de equivalência padrão e podem variar.
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Understand the concept
Density is a measure of “how much mass fits” in a given volume. In simple terms: the denser a material, the heavier it is for the same size.
The formula is straightforward: density = mass ÷ volume. Therefore, it is essential to keep the units consistent (for example, kg with m³, or g with cm³).
Practical example: if a material has a mass of 2 kg and occupies 1,000 cm³, first convert the volume: 1,000 cm³ = 0.001 m³. So density = 2 ÷ 0.001 = 2,000 kg/m³, which is equivalent to 2 g/cm³.
In everyday life, density appears in construction (weight of materials), engineering (selection of materials), laboratory (concentration and samples) and even cooking (why 1 cup of flour weighs less than 1 cup of sugar).
Important: actual density may vary by temperature, humidity, purity, porosity and manufacturing process. Use this calculator as a reference and, when necessary, confirm it in the material's technical data sheet.
How to use this tool
- Choose the mode: “Convert density” or “Calculate (mass ÷ volume)”.
- Enter values and select units.
- If desired, select a material to fill in a typical value.
- Copy the result and use it as a reference in your project.
FAQ
What is density?
It is the ratio between mass and volume (density = mass ÷ volume). It indicates how much mass there is in a given space.
Which unit should I use: kg/m³, g/cm³ or lb/ft³?
kg/m³ is common in engineering and construction; g/cm³ is common in the laboratory; lb/ft³ appears in Anglo-Saxon tables and references.
How to convert g/cm³ to kg/m³?
1 g/cm³ is equivalent to 1,000 kg/m³. For example, 2 g/cm³ = 2,000 kg/m³.
How to calculate density by mass and volume?
Use the “mass ÷ volume” mode, enter mass, volume and choose the output unit.
What are the most common errors when using density?
Mixing units (g with m³), forgetting to convert cm³ to m³ and using values with incorrect commas/periods.
Why can density vary for the same material?
Temperature, humidity, porosity and composition change the actual density.
Is density the same thing as “specific weight”?
No. Specific gravity involves force (weight) and depends on gravity. Density is mass per volume.
Technical notes
Base técnica
Formula: value_out = value_in × (factor_in ÷ factor_out). Unit & scope: in Density, we convert values between units (kgm3, gcm3, lbft3) using fixed conversion factors.
Referência
BIPM (SI Brochure) and NIST (SP 811/SP 330) for SI rules and conversion factors.