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: tonne/m³ = lb/in³ × 27.68
Multiply any lb/in³ value by 27.68 to get tonne/m³.
Reverse: lb/in³ = tonne/m³ × 0.03613
Common materials — factor: 1 lb/in³ = 27.68 t/m³
| lb/in³ (lb/in³) | tonne/m³ (t/m³) | Material |
|---|---|---|
| 1.000e-05 lb/in³ | 0.0002768 t/m³ | Gas |
| 0.0001 lb/in³ | 0.002768 t/m³ | Aerogel |
| 0.001 lb/in³ | 0.02768 t/m³ | Light foam |
| 0.01 lb/in³ | 0.2768 t/m³ | Wood |
| 0.0235 lb/in³ | 0.6505 t/m³ | Polycarbonate |
| 0.0361 lb/in³ | 0.9992 t/m³ | Water |
| 0.0368 lb/in³ | 1.019 t/m³ | Seawater |
| 0.058 lb/in³ | 1.605 t/m³ | Titanium light |
| 0.0975 lb/in³ | 2.699 t/m³ | Aluminum |
| 0.128 lb/in³ | 3.543 t/m³ | Titanium |
| 0.16 lb/in³ | 4.429 t/m³ | Titanium alloy |
| 0.284 lb/in³ | 7.861 t/m³ | Steel |
| 0.324 lb/in³ | 8.968 t/m³ | Copper |
| 0.409 lb/in³ | 11.32 t/m³ | Lead |
| 0.698 lb/in³ | 19.32 t/m³ | Gold |
1 lb/in³ = 27.68 t/m³.
Water = 1,000 kg/m³ = 1 g/cm³ = 1 kg/L = 62.4 lb/ft³ = 0.0361 lb/in³.
Multiply result by 0.03613 to recover the original lb/in³ value.
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.
Tonnes per cubic meter (t/m³) equals 1,000 kg/m³ and is numerically identical to g/cm³ and kg/L. It is used in mining, geology, bulk materials handling, and geotechnical engineering where material quantities are measured in metric tonnes.
Mining and civil engineering use t/m³ extensively: crushed rock = 1.6 t/m³, sand = 1.5–1.7 t/m³, concrete = 2.3 t/m³, iron ore = 5.0 t/m³. Soil density (bulk density) is typically 1.2–1.8 t/m³ depending on compaction.
Interesting fact: The density of Earth's crust averages about 2.7 t/m³; the mantle 3.3–5.6 t/m³; the core 9.9–13 t/m³. The average density of the entire Earth is 5.515 t/m³ — about 5.5 times denser than water.
Converting lb/in³ to tonne/m³ 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 tonne/m³ — a universal anchor for density comparisons.
Exact factor: 1 lb/in³ = 27.68 t/m³. Reverse: 1 t/m³ = 0.03613 lb/in³.
All conversions use IEEE 754 double-precision arithmetic, accurate to at least 8 significant figures.