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kg/m³, g/cm³, g/l, lb/ft³
This converter instantly transforms density values between the most common units – kg/m³, g/cm³, g/l, and lb/ft³. It uses fixed conversion factors derived from the relationships between metric and imperial measurement systems. Enter any value and all equivalent densities appear at once.
1 kg/m³ equals 0.001 g/cm³. The full conversion table for all 7 units is right below the calculator.
| Unit | kgm3 | gcm3 | gL | kgL | lbft3 | lbin3 | lbgal |
|---|---|---|---|---|---|---|---|
| 1 kg/m³ | 1 | 0.001 | 1 | 0.001 | 0.062428 | 3.6127e-5 | 0.008345 |
| 1 g/cm³ | 1000 | 1 | 1000 | 1 | 62.427818 | 0.036127 | 8.345434 |
| 1 g/l | 1 | 0.001 | 1 | 0.001 | 0.062428 | 3.6127e-5 | 0.008345 |
| 1 kg/l | 1000 | 1 | 1000 | 1 | 62.427818 | 0.036127 | 8.345434 |
| 1 lb/ft³ | 16.0185 | 0.016018 | 16.0185 | 0.016018 | 1 | 0.000579 | 0.133681 |
| 1 lb/in³ | 27679.9 | 27.6799 | 27679.9 | 27.6799 | 1727.995755 | 1 | 231.000784 |
| 1 lb/gal (US) | 119.826 | 0.119826 | 119.826 | 0.119826 | 7.480476 | 0.004329 | 1 |
Rounded to six significant digits.
Multiply the density value by the ratio between the two units, since every density unit is just a mass unit divided by a volume unit. For example, going from kilograms per cubic metre to grams per cubic centimetre means converting both the mass part and the volume part.
Weight alone is not enough — you also need the volume the material occupies, because density is mass divided by volume. Convert the weight to a mass unit, measure or calculate the volume, then divide.
Convert the mass part of your unit to pounds and the volume part to US or imperial gallons, then divide mass by volume. Note that the US gallon and the imperial gallon differ, so pick the one your data refers to.
Divide the mass of the object by its volume. Weigh the object on a scale, determine the volume geometrically or by water displacement, and keep both values in matching unit systems.
Density equals mass divided by volume, usually written as ρ = m / V. Rearranged, mass is ρ · V and volume is m / ρ.
They are the three rearrangements of the same relation: ρ = m / V, m = ρ · V and V = m / ρ. Which one you use depends on whether you are missing density, mass or volume.
Weight density (specific weight) is γ = W / V, the weight divided by the volume, which also equals ρ · g. It is expressed in units like newtons per cubic metre or pounds-force per cubic foot.
Common examples include air, water, aluminium, iron and lead, listed here from lightest to heaviest per unit volume. The same ordering explains why wood floats on water while metals sink.
Measure the mass with a balance and the volume either from the object's dimensions or by the water it displaces, then divide mass by volume. For liquids, a hydrometer or a pycnometer of known volume gives the density directly.
Density is one of the most fundamental physical quantities in science and engineering. It tells us how much mass is packed into a given volume. While the concept is universal, the units used to express density vary widely across disciplines and regions. Our free density converter makes it effortless to switch between kg/m³, g/cm³, g/l, and lb/ft³ — instantly and accurately.
Density is defined by the formula ρ = m/V (mass divided by volume). For example, water has a density of 1,000 kg/m³, which is the same as 1 g/cm³ or approximately 1 g/l. Steel, by contrast, has a density of about 7,850 kg/m³ — nearly eight times denser than water.
The challenge arises when professionals, students, or hobbyists work across different measurement systems. American engineering documents often list material densities in lb/ft³, while European and international standards rely on kg/m³. Incorrect conversions can lead to serious errors — whether in structural calculations, chemical formulations, or logistics planning.
These units are mathematically linked: 1 g/cm³ = 1,000 kg/m³ = 62.428 lb/ft³. Our converter handles these relationships instantly — no manual calculations required.
Using the converter is straightforward:
There's no need to memorize formulas or install software. The free online density converter works directly in your browser on any device — smartphone, tablet, or desktop.
Architects and structural engineers deal with material densities daily. Concrete has a density of approximately 2,400 kg/m³ (about 149.8 lb/ft³). When working with American specifications, converting these values correctly is essential for accurate load calculations and safe structural design.
Chemists frequently use g/cm³ or g/l. Sulfuric acid, for instance, has a density of about 1.84 g/cm³. For international publications or when interpreting foreign material safety data sheets, converting to kg/m³ or lb/ft³ is often necessary.
When calculating freight weights and cargo volumes, density is critical. Knowing the density of liquids, bulk solids, or metals — and being able to convert it accurately — helps optimize load planning and avoid costly mistakes.
Physics and chemistry students regularly encounter different unit systems. Our converter allows quick verification of answers and supports cross-checking of textbook values — a valuable tool for homework and exam preparation.
These values highlight just how dramatically the numbers differ depending on the unit chosen. A steel density of 7.85 g/cm³ sounds very different from 489.9 lb/ft³, yet both describe exactly the same physical property.
Both units measure density at different scales. 1 g/cm³ = 1,000 kg/m³. This is because 1 kg = 1,000 g and 1 m³ = 1,000,000 cm³, resulting in a net factor of 1,000. The unit g/cm³ is often preferred in chemistry for dense solids, while kg/m³ is the official SI unit.
The conversion factor is: 1 lb/ft³ = 16.0185 kg/m³. Conversely, 1 kg/m³ = 0.06243 lb/ft³. Our converter handles this instantly — just enter your value and get the result right away.
Yes: 1 g/l = 1 kg/m³. Since 1 liter = 0.001 m³ and 1 gram = 0.001 kg, the ratio works out exactly. This unit is especially common in laboratory chemistry for describing solutions.
Engineers, chemists, physicists, architects, logisticians, students, and anyone working with international standards or technical datasheets will find this tool invaluable. It's also useful for DIY enthusiasts who need quick density conversions for materials.
Yes — the density converter on simple-calculator.online is 100% free, requires no registration, and works directly in your browser on any device at any time.