Density Converter
Convert between kg/m³, g/cm³, lb/ft³, and more. Calculate density from mass and volume. Includes a materials reference table, buoyancy calculator, and specific gravity tool.
Quick Calculator Get a fast estimate
kg/m³
1000 kg/m³
g/cm³ (g/mL)
1 g/cm³
kg/L
1 kg/L
lb/ft³
62.4278 lb/ft³
lb/in³
0.036127 lb/in³
lb/gal (US)
8.3454 lb/gal
oz/in³
0.578038 oz/in³
Specific gravity (vs water)
1
Link copied to clipboard!
How to Use the Density Converter
Select the unit you are converting from, enter the value, and all equivalent densities appear instantly. For calculating density from measurements, use the Extended Calculator which has a dedicated mass/volume tool.
The Professional Calculator includes Archimedes buoyancy, mixture density, and hydrometer-based specific gravity measurement.
Need more detail?
Extended Calculator More options, charts, and scenario comparison
Conversions
1000 kg/m³
g/cm³ (= g/mL)
1
kg/L
1
lb/ft³
62.4278
lb/gal (US)
8.3454
Specific gravity
1
Density Conversion Formulas
Density = mass ÷ volume (ρ = m/V)
Specific gravity = ρ_material / ρ_water (ρ_water = 1000 kg/m³)
Unit conversions:
1 g/cm³ = 1000 kg/m³ = 1 kg/L
1 lb/ft³ = 16.0185 kg/m³
1 lb/gal (US) = 119.826 kg/m³
Buoyancy: Fb = ρ_fluid × V_displaced × g
Density of Common Materials
| Material | kg/m³ | g/cm³ | lb/ft³ |
|---|---|---|---|
| Air (15°C) | 1.225 | 0.001225 | 0.0765 |
| Water (4°C) | 1000 | 1.000 | 62.43 |
| Seawater | 1025 | 1.025 | 63.99 |
| Concrete | 2300 | 2.300 | 143.6 |
| Steel | 7850 | 7.850 | 490.0 |
| Aluminium | 2700 | 2.700 | 168.6 |
| Pine wood | 530 | 0.530 | 33.1 |
| Gold | 19300 | 19.30 | 1205 |
Need full precision?
Professional Calculator Complete parameters, sensitivity analysis, and detailed breakdown
kg/m³
kg/m³
Buoyancy Result
Object SINKS
Buoyant force (Fb)
98.1 N
Weight (Fg)
770.09 N
Net force
-671.99 N (downward)
Archimedes' Principle: Fb = ρ_fluid × V × g. Object floats if ρ_object < ρ_fluid. Steel ships float because their average density (hull + air) is less than water.
Frequently Asked Questions
Multiply g/cm³ by 1000 to get kg/m³. Water = 1 g/cm³ = 1000 kg/m³. This is because 1 m³ = 1,000,000 cm³ and 1 kg = 1000 g, giving a factor of 1,000,000/1000 = 1000.
SG = density of material ÷ density of water (1000 kg/m³). Dimensionless. SG > 1 = denser than water (sinks), SG < 1 = less dense (floats). Used extensively in mining, brewing, battery acid testing, and concrete mix design.
Fb = ρ_fluid × V × g. An object floats when buoyant force ≥ weight. Ships float because hull + air space averages below 1000 kg/m³. Submarines control depth by adjusting ballast tank water volume.
ρ = m/V. Example: 2 kg of material in 0.5 L = 2 kg / 0.0005 m³ = 4000 kg/m³. Rearrange for mass (m = ρV) or volume (V = m/ρ).
SA construction: concrete 2200–2400 kg/m³, masonry sand 1600 kg/m³, crushed stone 1700 kg/m³, clay brick 1800 kg/m³, steel reinforcing 7850 kg/m³, pine timber ~530 kg/m³. Used for dead load calculations to SANS 10160.