Convert density units — kg/m³, g/cm³, lb/ft³, lb/in³ and more.
| Unit | Name | Value |
|---|---|---|
| kg/m³ | Kilogram/Cubic Meter | 27679.9 |
| g/cm³ | Gram/Cubic Centimeter | 27.6799 |
| kg/L | Kilogram/Liter | 27.6799 |
| lb/ft³ | Pound/Cubic Foot | 1727.9958 |
| oz/in³ | Ounce/Cubic Inch | 16.000035 |
| t/m³ | Tonne/Cubic Meter | 27.6799 |
Formula: g/cm³ = lb/in³ × 27.68
Multiply any lb/in³ value by 27.68 to get g/cm³.
Reverse: lb/in³ = g/cm³ × 0.03613
Common materials — factor: 1 lb/in³ = 27.68 g/cm³
| lb/in³ (lb/in³) | g/cm³ (g/cm³) | Material |
|---|---|---|
| 1.000e-05 lb/in³ | 0.0002768 g/cm³ | Gas |
| 0.0001 lb/in³ | 0.002768 g/cm³ | Aerogel |
| 0.001 lb/in³ | 0.02768 g/cm³ | Light foam |
| 0.01 lb/in³ | 0.2768 g/cm³ | Wood |
| 0.0235 lb/in³ | 0.6505 g/cm³ | Polycarbonate |
| 0.0361 lb/in³ | 0.9992 g/cm³ | Water |
| 0.0368 lb/in³ | 1.019 g/cm³ | Seawater |
| 0.058 lb/in³ | 1.605 g/cm³ | Titanium light |
| 0.0975 lb/in³ | 2.699 g/cm³ | Aluminum |
| 0.128 lb/in³ | 3.543 g/cm³ | Titanium |
| 0.16 lb/in³ | 4.429 g/cm³ | Titanium alloy |
| 0.284 lb/in³ | 7.861 g/cm³ | Steel |
| 0.324 lb/in³ | 8.968 g/cm³ | Copper |
| 0.409 lb/in³ | 11.32 g/cm³ | Lead |
| 0.698 lb/in³ | 19.32 g/cm³ | Gold |
lb/in³ × 27.68 = g/cm³.
0.0361 lb/in³ = 1 g/cm³ (water). 0.284 lb/in³ = 7.86 g/cm³ (steel).
g/cm³ × 0.0361 = lb/in³.
Compares material densities to optimize weight-to-strength ratios in product design.
Calculates dead loads from material densities for structural design in kg/m³ and lb/ft³.
Selects lightweight materials (aluminum, titanium, composites) based on density in g/cm³ or lb/in³.
Measures crude oil and drilling fluid density in kg/m³ or lb/ft³ for reservoir engineering.
Measures soil and rock bulk density in t/m³ for foundation and slope stability analysis.
Uses density in g/cm³ for solution concentration, specific gravity, and process design calculations.
Pounds per cubic inch (lb/in³) is used in aerospace, precision machining, and materials engineering where compact unit sizes are practical. One lb/in³ equals 27,679.9 kg/m³.
lb/in³ is standard in US aerospace for specifying material density in structural weight calculations: aluminum = 0.098 lb/in³, titanium = 0.160 lb/in³, steel = 0.284 lb/in³. The unit is preferred because aircraft structural calculations often work in inch-pound units.
Interesting fact: The density of uranium is 0.69 lb/in³ (19,100 kg/m³), making it about 2.4 times denser than steel. This high density — combined with its nuclear properties — makes it valuable for radiation shielding and as kinetic energy penetrators.
Grams per cubic centimeter (g/cm³) equals exactly 1,000 kg/m³ and is numerically identical to g/mL and kg/L. It became popular in chemistry and materials science because water has a convenient density of exactly 1 g/cm³ at 4°C.
Specific gravity (relative density) is defined relative to water at 1 g/cm³, making g/cm³ intuitive for chemists. Gemstone density is expressed in g/cm³: diamond = 3.52 g/cm³, sapphire = 4.0 g/cm³. Metals: iron = 7.87 g/cm³, copper = 8.96 g/cm³.
Interesting fact: The human body has an average density of about 0.985 g/cm³ — just below water — which is why most people float. Fat has a density of ~0.9 g/cm³ while muscle is ~1.06 g/cm³.
Converting lb/in³ to g/cm³ is common in materials science, engineering, and manufacturing. SI units (kg/m³, g/cm³) are standard in scientific and metric engineering contexts, while Imperial units (lb/ft³, lb/in³) are used in US construction and aerospace. Water at 4°C = 0.03613 lb/in³ = 1 g/cm³ — a universal anchor for density comparisons.
Exact factor: 1 lb/in³ = 27.68 g/cm³. Reverse: 1 g/cm³ = 0.03613 lb/in³.
All conversions use IEEE 754 double-precision arithmetic, accurate to at least 8 significant figures.