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Material density converter between kg/m³, g/cm³, g/mL, lb/ft³, and lb/gal for engineering, chemistry, and shipping calculations.
Unit
Generated on July 8, 2026
Material density converter between kg/m³, g/cm³, g/mL, lb/ft³, and lb/gal for engineering, chemistry, and shipping calculations.
A density converter moves between the common units of mass per unit volume: kg/m³ (SI), g/cm³ or g/mL (chemistry and compact materials), lb/ft³ (US construction), and lb/gal (US petroleum and liquids). Density is a fundamental property of every material — it controls whether something floats or sinks, how heavy a structure will be, and how concentrated a liquid is. Water is the easy reference point: pure water has density 1.
Formula
1 g/cm³ = 1,000 kg/m³. 1 g/mL = 1 g/cm³. 1 lb/ft³ ≈ 16.0185 kg/m³. 1 lb/gal (US) ≈ 119.826 kg/m³.Density conversions show up in three specific Pakistani engineering moments. First: you're calculating the load of a concrete slab on a structural drawing — concrete is 2,400 kg/m³, so a 6m × 4m × 0.15m slab weighs about 8,640 kg, which is the difference between a beam that holds and a beam that cracks. Second: you're sizing a steel-versus-aluminum component for an industrial project and need to compare strength-to-weight ratios (aluminum at 2.7 g/cm³ versus steel at 7.85 g/cm³ — almost a 3× weight difference, which is why aircraft are aluminum and not steel). Third: you're verifying the purity of gold jewelry — pure 24k gold has density 19.3 g/cm³, while 18k gold (75 percent gold + 25 percent alloy) drops to about 15.6 g/cm³, and goldsmiths can detect adulterated gold by weighing it underwater (Archimedes' technique still works in 2026). The unifying truth is that water (1 g/cm³ = 1,000 kg/m³) is the universal reference — anything denser sinks, anything less dense floats. Conversion between g/cm³ and kg/m³ is always exactly a factor of 1,000, never any other number. Honest take: in everyday Pakistani life, the only density conversion you'll need is for building work (concrete loads, steel weights), or for gold verification (the most reliable way to detect fake or low-karat jewelry at a jeweler).
A density converter moves between the common units of mass per unit volume: kg/m³ (SI), g/cm³ or g/mL (chemistry and compact materials), lb/ft³ (US construction), and lb/gal (US petroleum and liquids). Density is a fundamental property of every material — it controls whether something floats or sinks, how heavy a structure will be, and how concentrated a liquid is. Water is the easy reference point: pure water has density 1.00 g/cm³ at 4 °C, which equals exactly 1,000 kg/m³.
Density is mass divided by volume (ρ = m / V). The SI unit is kilogram per cubic meter, but g/cm³ is equally popular because water's density is a convenient 1.00 g/cm³ — values above 1 sink, below 1 float. Because 1 g = 0.001 kg and 1 cm³ = 10⁻⁶ m³, the two units differ by exactly a factor of 1,000. Imperial units (lb/ft³, lb/gal) are legacy conventions in US construction and petroleum.
Density of common materials across several unit systems — useful for engineering and shipping calculations.
| Material | kg/m³ | g/cm³ | lb/ft³ |
|---|---|---|---|
| Air (sea level) | 1.225 | 0.00123 | 0.0765 |
| Ice | 917 | 0.917 | 57.2 |
| Water (4 °C) | 1,000 | 1.000 | 62.4 |
| Aluminium | 2,700 | 2.70 | 168.5 |
| Concrete | 2,400 | 2.40 | 149.8 |
| Steel | 7,850 | 7.85 | 489.8 |
| Copper | 8,960 | 8.96 | 559.1 |
| Lead | 11,340 | 11.34 | 707.7 |
| Gold | 19,320 | 19.32 | 1,205.9 |
| Osmium (densest element) | 22,590 | 22.59 | 1,409.9 |
1 g/cm³ = 1,000 kg/m³ — water's density, the universal reference point.
Gold (19.32 g/cm³) is so dense that a 10 cm cube weighs over 19 kg.
Concrete (2.4 g/cm³) is ~2.4× as dense as water — a common 1 m³ block weighs 2,400 kg.
Osmium is so dense that a basketball-sized sphere would weigh more than a small car.
Pure water at 4 °C has a density of exactly 1.00 g/cm³ or 1,000 kg/m³ — the reference baseline for all other materials.
Steel has a density of about 7.85 g/cm³ — 7.85 times heavier than the same volume of water.
Aluminum is 2.70 g/cm³, roughly one-third the density of steel — the reason it is preferred where weight matters.
Gold is 19.3 g/cm³, almost 2.5 times denser than steel — which is why a gold bar feels 'impossibly' heavy.
Human body density is close to 1 g/cm³ — which is why we float when the lungs are full and sink when we exhale.
Air at sea level has density 1.225 kg/m³ — about 1/800 the density of water.
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