lb/in³ to g/cm³ Converter
Convert pounds per cubic inch to grams per cubic centimeter — one lb/in³ is 27.68 g/cm³. Results update as you type; exact factors shown.
One pound per cubic inch is 27.6799 gram per cubic centimeter — see the exact factor, not a rounded rule of thumb.
How the lb/in³ to g/cm³ converter works
Density converts through kg/m³. 1 g/cm³ = 1 kg/L = 1,000 kg/m³ (water at 4 °C). 1 lb/ft³ = 16.0185 kg/m³ and 1 lb/US gal = 119.83 kg/m³. Concrete is about 2,400 kg/m³, steel 7,850 kg/m³, petrol about 740 kg/m³.
The US uses customary units (US gallon, short ton, °F) in daily life; NIST SP 811 gives the exact SI factors.
Common density conversions
| From | To | Units |
|---|---|---|
| 0.01 lb/in³ | 0.2768 g/cm³ | pound per cubic inch to gram per cubic centimeter |
| 0.03 lb/in³ | 0.8304 g/cm³ | pound per cubic inch to gram per cubic centimeter |
| 0.05 lb/in³ | 1.384 g/cm³ | pound per cubic inch to gram per cubic centimeter |
| 0.1 lb/in³ | 2.768 g/cm³ | pound per cubic inch to gram per cubic centimeter |
| 0.2 lb/in³ | 5.536 g/cm³ | pound per cubic inch to gram per cubic centimeter |
| 0.28 lb/in³ | 7.7504 g/cm³ | pound per cubic inch to gram per cubic centimeter |
| 0.3 lb/in³ | 8.304 g/cm³ | pound per cubic inch to gram per cubic centimeter |
| 0.32 lb/in³ | 8.8576 g/cm³ | pound per cubic inch to gram per cubic centimeter |
| 0.41 lb/in³ | 11.3488 g/cm³ | pound per cubic inch to gram per cubic centimeter |
| 0.5 lb/in³ | 13.84 g/cm³ | pound per cubic inch to gram per cubic centimeter |
| 0.7 lb/in³ | 19.3759 g/cm³ | pound per cubic inch to gram per cubic centimeter |
| 1 lb/in³ | 27.6799 g/cm³ | pound per cubic inch to gram per cubic centimeter |
Units in this converter and their exact factors
| Unit | Symbol | One unit in kilogram per cubic meters |
|---|---|---|
| kilogram per cubic meter | kg/m³ | 1 kilogram per cubic meter |
| gram per cubic centimeter | g/cm³ | 1,000 kilogram per cubic meter |
| gram per milliliter | g/mL | 1,000 kilogram per cubic meter |
| kilogram per liter | kg/L | 1,000 kilogram per cubic meter |
| pound per cubic foot | lb/ft³ | 16.018463374 kilogram per cubic meter |
| pound per cubic inch | lb/in³ | 27,679.9047102 kilogram per cubic meter |
| pound per US gallon | lb/US gal | 119.826427317 kilogram per cubic meter |
| ounce per cubic inch | oz/in³ | 1,729.99404 kilogram per cubic meter |
| tonne per cubic meter | t/m³ | 1,000 kilogram per cubic meter |
FAQFrequently asked questions about density conversion
How many g/cm³ is 1 lb/in³?
27.6799 g/cm³.
What is steel in lb/in³?
About 0.284 lb/in³, which is 7.85 g/cm³.
Why is the factor so large?
Because a cubic inch is small and a pound is not — the unit describes very dense material.
Where is lb/in³ used?
US materials engineering, especially for metals.
What is lead?
0.41 lb/in³, or 11.34 g/cm³.
Where these figures come from
- BIPM — The International System of Units (SI Brochure, 9th edition) — definitions of the base and derived units.
- NIST Special Publication 811 — Guide for the Use of the International System of Units — the exact conversion factors used here.
- National Institute of Standards and Technology (NIST) — United States's national measurement authority.
Last checked: September 2026. Conversion factors are fixed by definition and do not change with tax years or regulations.