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Density Conversion
Tool Description
Density Conversion is an online density unit converter that supports mutual conversion among 15 units across metric (kg/m³, g/cm³, g/m³, mg/m³, kg/L, g/L, t/m³), imperial (lb/ft³, lb/in³, lb/UK gal, lb/US gal), and ounce series (oz/ft³, oz/in³, oz/UK gal, oz/US gal). Enter any value and unit to instantly view corresponding results in all other units, suitable for physics learning, materials science, chemical engineering, petroleum industry, logistics and transportation, and more.
How to Use
- Enter value
Input the value to convert in the input field, supporting integers and decimals, e.g.,
1000,7.85 - Select source unit
Choose the density unit of the current value from the dropdown list (kg/m³/g/cm³/kg/L/g/L/t/m³/lb/ft³/lb/in³/lb/UK gal/lb/US gal/oz/ft³/oz/in³/oz/UK gal/oz/US gal)
- View results
Click the "Convert" button or press Enter, and the result area below will display corresponding values in all units, with a copy button on the right of each result for convenient use
Use Cases
- Physics & Materials Science: Compare densities of different materials (e.g., steel 7.85 g/cm³, aluminum 2.7 g/cm³), quickly convert between g/cm³ and kg/m³; calculate the relationship between mass, volume, and density
- Chemical & Petroleum Industry: Convert liquid density between lb/US gal and kg/m³, cross-reference API gravity with density for petroleum products; unify density units across different national standards in chemical storage and transportation
- Logistics & Transportation: Calculate cargo density, understand goods density in metric (kg/m³) and imperial (lb/ft³) units for container loading planning; density conversion for volumetric weight in express shipping billing
Key Advantages
- Completely Free
All features are free to use with no registration or payment required. Simply open the page and start using it immediately, with no feature restrictions or usage limits.
- Privacy Safe
All conversions run entirely in your browser locally. Your input data is never uploaded to any server, fully protecting your privacy and data security.
- Comprehensive Units
Supports fifteen common density units across metric, imperial, and ounce series, covering kg/m³, g/cm³, lb/ft³, lb/UK gal, etc., meeting conversion needs across various industries.
- Instant Conversion
Enter a value and select a unit to get results for all units instantly. No waiting, fast response, what you see is what you get.
- Easy to Use
The interface is clean and intuitive, requiring no expertise. Beginners can easily get started, and every result offers one-click copy.
Density Unit Conversion Relationships
The following shows the conversion relationships between density units, with kilogram per cubic meter (kg/m³) as the base unit:
| Unit Name | Abbreviation | Conversion Relationship | Equivalent kg/m³ |
|---|---|---|---|
| Kilogram per cubic meter | kg/m³ | 1 kg/m³ = 1 kg/m³ | 1 |
| Gram per cubic meter | g/m³ | 1 g/m³ = 0.001 kg/m³ | 0.001 |
| Gram per cubic centimeter | g/cm³ | 1 g/cm³ = 1,000 kg/m³ | 1,000 |
| Milligram per cubic meter | mg/m³ | 1 mg/m³ = 0.000001 kg/m³ | 0.000001 |
| Kilogram per liter | kg/L | 1 kg/L = 1,000 kg/m³ | 1,000 |
| Gram per liter | g/L | 1 g/L = 1 kg/m³ | 1 |
| Tonne per cubic meter | t/m³ | 1 t/m³ = 1,000 kg/m³ | 1,000 |
| Pound per cubic foot | lb/ft³ | 1 lb/ft³ ≈ 16.0185 kg/m³ | 16.0185 |
| Pound per cubic inch | lb/in³ | 1 lb/in³ ≈ 27,679.9 kg/m³ | 27,679.9 |
| Pound per UK gallon | lb/UK gal | 1 lb/UK gal ≈ 99.776 kg/m³ | 99.776 |
| Pound per US gallon | lb/US gal | 1 lb/US gal ≈ 119.826 kg/m³ | 119.826 |
Common Material Density Reference Values
The following shows density values of common materials for reference comparison (temperature 20°C, standard atmospheric pressure):
| Material | Density |
|---|---|
| Air (20°C) | 0.001225 g/cm³ (1.225 kg/m³) |
| Water vapor (100°C) | 0.001 g/cm³ (1 kg/m³) |
| Wood (pine/oak) | 0.5 ~ 0.9 g/cm³ |
| Water (4°C) | 1.0 g/cm³ (1,000 kg/m³) |
| Seawater | 1.03 g/cm³ (1,030 kg/m³) |
| Aluminum | 2.7 g/cm³ (2,700 kg/m³) |
| Steel/Iron | 7.85 g/cm³ (7,850 kg/m³) |
| Copper | 8.96 g/cm³ (8,960 kg/m³) |
| Lead | 11.34 g/cm³ (11,340 kg/m³) |
| Mercury | 13.55 g/cm³ (13,550 kg/m³) |
| Gold | 19.32 g/cm³ (19,320 kg/m³) |
Density and Temperature Relationship
Effect of temperature on density: The density of most substances changes with temperature. For solids and liquids, increasing temperature causes volume expansion and density decrease; decreasing temperature causes volume contraction and density increase. Gas density is particularly sensitive to both temperature and pressure changes.
Taking water as an example: water reaches its maximum density at 4°C, approximately 1,000 kg/m³ (1 g/cm³). When heated to 100°C, water density drops to about 958 kg/m³; when cooled to 0°C and frozen, ice density is about 917 kg/m³, which is lighter than water — this is why ice floats on water.
In engineering practice, if precise density calculations are required (such as fuel metering or chemical proportioning), temperature factors must be considered. This tool provides pure numerical conversion; in actual applications, corrections should be made based on the substance's temperature-density curve.
FAQ
1 g/cm³ = 1,000 kg/m³. Conversion principle: 1 g/cm³ = 0.001 kg / 0.000001 m³ = 1,000 kg/m³. This is one of the most commonly used density conversions. For example, water has a density of about 1 g/cm³ = 1,000 kg/m³, and iron has a density of about 7.85 g/cm³ = 7,850 kg/m³. Conversely, 1 kg/m³ = 0.001 g/cm³.
1 kg/L = 1,000 kg/m³, 1 kg/m³ = 0.001 kg/L. Since 1 liter (L) = 0.001 cubic meter (m³), the same mass distributed in 1 liter volume has 1,000 times the density of that distributed in 1 cubic meter. For example, gasoline density is about 0.75 kg/L = 750 kg/m³, and milk density is about 1.03 kg/L = 1,030 kg/m³.
Since 1 UK gallon ≈ 4.546 L and 1 US gallon ≈ 3.785 L, they differ by about 20%. Therefore, for the same lb/gal value, the UK measure represents a lower density. For example, a liquid with density of 10 lb/UK gal ≈ 997.8 kg/m³, while 10 lb/US gal ≈ 1,198.3 kg/m³. When reading British or American petroleum and chemical documents, pay attention to the gallon type — this tool supports both gallon units.
Water reaches its maximum density at 4°C (approximately 1,000 kg/m³) because of hydrogen bonds between water molecules. As water temperature rises from 0°C, hydrogen bonds gradually break, allowing molecules to pack more tightly and density to increase; above 4°C, thermal expansion from increased molecular motion dominates and density begins to decrease. This property keeps the bottom water of lakes at about 4°C in winter, protecting aquatic life through the cold season.
No. All conversion calculations run entirely in your browser using pure JavaScript math. Your input data never leaves your device, so please feel free to use it.
This tool uses JavaScript double-precision floating-point numbers (64-bit IEEE 754) for calculations, providing sufficient accuracy for the vast majority of everyday scenarios. Imperial units use internationally standardized conversion ratios (1 lb = 0.45359237 kg, 1 ft = 0.3048 m, 1 UK gal = 4.54609 L, 1 US gal = 3.785411784 L). Decimal portions are capped at 6 significant decimal places, and excessively long decimals are automatically truncated. For extremely large or small values, there may be minor errors due to floating-point precision limitations, but this has virtually no practical impact.
Fifteen common units are supported: metric (kg/m³, g/cm³, g/m³, mg/m³, kg/L, g/L, t/m³), imperial (lb/ft³, lb/in³, lb/UK gal, lb/US gal), and the ounce series (oz/ft³, oz/in³, oz/UK gal, oz/US gal). This covers multiple industries such as physics, materials, chemical engineering, petroleum, and logistics.
No login and no limits. This tool is completely free to use. Just open the page to start; no account registration is needed, and there is no daily conversion limit, making it ideal for on-the-go density conversions anytime.
1 lb/ft³ ≈ 16.0185 kg/m³. Based on: 1 lb = 0.45359237 kg, 1 ft³ = 0.0283168 m³, so 1 lb/ft³ = 0.45359237 ÷ 0.0283168 ≈ 16.0185 kg/m³. This tool gives corresponding values for all imperial and metric units with one click.
Yes. This tool uses a responsive layout that perfectly adapts to phone, tablet, and desktop browsers. No app installation is required, and it runs smoothly in any mobile browser such as WeChat, Safari, or Chrome.
Material density is affected by temperature, pressure, purity, and measurement methods. For example, steel density is about 7.85 g/cm³ but varies slightly by alloy composition; water reaches its maximum density at 4°C. The reference values provided by this tool are based on standard ambient temperature and pressure; for scientific research, please rely on authoritative handbooks.
Professional software can handle temperature-density curves, mixture densities, and complex property calculations, while this tool focuses on fast unit-to-unit conversion. They complement each other: use this tool for daily unit conversion first, then turn to professional software for precise engineering calculations — higher efficiency and easier to use.
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