Density calculator
Find density, mass or volume in g/cm³ or lb/ft³, and compare with common materials.
- 🇺🇸 US federal & state rules
- See sources
Density
2.768 g/cm³
172.8 lb/ft³, 2,768 kg/m³
- In lb/in³
- 0.1 lb/in³
- In water (68 °F)
- Sinks
- Specific gravity
- 2.774
- Closest material
- Aluminum, 2.7 g/cm³
This is an example. Enter your numbers above and press the button to see your own result.
Density of common materials
| Air (68 °F, 1 atm) | 0.0012 g/cm³, 0.07491 lb/ft³ |
|---|---|
| Ethanol (68 °F) | 0.789 g/cm³, 49.26 lb/ft³ |
| Ice (32 °F) | 0.917 g/cm³, 57.25 lb/ft³ |
| Water (68 °F) | 0.998 g/cm³, 62.3 lb/ft³ |
| Seawater (typical) | 1.025 g/cm³, 63.99 lb/ft³ |
| Magnesium (room temp) | 1.74 g/cm³, 108.6 lb/ft³ |
| Aluminum (room temp) | 2.7 g/cm³, 168.6 lb/ft³ |
| Your object | 2.768 g/cm³, 172.8 lb/ft³ |
| Titanium (room temp) | 4.51 g/cm³, 281.6 lb/ft³ |
| Zinc (room temp) | 7.13 g/cm³, 445.1 lb/ft³ |
| Iron (room temp) | 7.87 g/cm³, 491.3 lb/ft³ |
| Nickel (room temp) | 8.91 g/cm³, 556.2 lb/ft³ |
| Copper (room temp) | 8.96 g/cm³, 559.4 lb/ft³ |
| Silver (room temp) | 10.49 g/cm³, 654.9 lb/ft³ |
| Lead (room temp) | 11.34 g/cm³, 707.9 lb/ft³ |
| Mercury (77 °F, liquid) | 13.53 g/cm³, 844.7 lb/ft³ |
| Tungsten (room temp) | 19.3 g/cm³, 1,205 lb/ft³ |
| Gold (room temp) | 19.32 g/cm³, 1,206 lb/ft³ |
| Platinum (room temp) | 21.45 g/cm³, 1,339 lb/ft³ |
- Whether something floats depends on its average density. A hollow steel boat floats even though steel is almost 8 times denser than water.
- Material values are typical figures for pure substances. Alloys, temperature and purity change them a little.
Show the math
| Formula | density = mass ÷ volume |
|---|---|
| In grams and cm³ | 453.6 g ÷ 163.9 cm³ = 2.768 g/cm³ |
What to do next
How it works
The calculator turns your mass into grams and your volume into cubic centimeters, then uses density = mass ÷ volume. Pick Mass or Volume above to solve for the other two ways: mass = density × volume, and volume = mass ÷ density.
Unit factors are exact: 1 lb is 453.59237 g, 1 cubic inch is 16.387064 cm³ and 1 US gallon is 231 cubic inches. One g/cm³ equals 62.428 lb/ft³ and 1,000 kg/m³.
Things to keep in mind
Density changes with temperature, especially for liquids and gases. The material list uses room temperature values from the CRC Handbook, with water at 68 °F (0.998 g/cm³).
Sources
- NIST SP 811, Appendix B.8: Factors for units listed alphabeticallyChecked 2026-10-19
- USGS Water Science School: Water densityChecked 2026-10-19
- PubChem Periodic Table: element densitiesChecked 2026-10-19
Frequently asked questions
What is the density formula?
Density = mass ÷ volume. A 270 g block that takes up 100 cm³ has a density of 2.7 g/cm³, which is aluminum.
How do I convert g/cm³ to lb/ft³?
Multiply by about 62.43. Water at 1 g/cm³ is about 62.4 lb/ft³, and steel at 7.85 g/cm³ is about 490 lb/ft³.
How do I find mass from density and volume?
Multiply them. A cubic foot of water (62.3 lb/ft³ at room temperature) weighs about 62.3 lb.
Will my object float?
If its average density is lower than water (about 1 g/cm³ or 62.3 lb/ft³), it floats. Ice at 0.917 g/cm³ floats with about 92% under the surface.