Pound/cubic inch to Kilogram/cubic meter Converter
Enter the value that you want to convert pound/cubic inch (lb/in³) to kilogram/cubic meter (kg/m³) or kilogram/cubic meter to pound/cubic inch.Also written as LB/IN³ to KG/M³ conversion.
1 pound/cubic inch = 27679.9050000 kilogram/cubic meter
Formula: kilogram/cubic meter = pound/cubic inch value × 27679.9050000
LB/IN³ to KG/M³ — pound/cubic inch to kilogram/cubic meter
10 pound/cubic inch = 276799.05000 kilogram/cubic meter
Popular Density Converters:
Why Convert Pound/cubic inch to Kilogram/cubic meter?
About the Pound/cubic inch
Pound/cubic inch (lb/in³) is a unit of density measurement. 1 pound/cubic inch is equal to 27679.9050000 kilogram/cubic meter.
The Kilogram/cubic meter in Engineering
Kilogram/cubic meter (kg/m³) is a unit of density measurement. 1 kilogram/cubic meter is equal to 0.0000361 pound/cubic inch.
Density Conversions in Materials Science
Density units vary by industry: chemists use g/mL or g/cm³, engineers use kg/m³, and American petroleum standards use lb/ft³ or lb/gal. Quality control in manufacturing, buoyancy calculations in naval architecture, concrete mix design, and oil/gas well logging all require converting between density units. Different countries and standards bodies specify materials in different density units.
pound/cubic inch to kilogram/cubic meter metric conversion table
| 0.01 lb/in³ | = | 276.79905 kg/m³ |
| 0.1 lb/in³ | = | 2767.99050 kg/m³ |
| 1 lb/in³ | = | 27679.90500 kg/m³ |
| 2 lb/in³ | = | 55359.81000 kg/m³ |
| 3 lb/in³ | = | 83039.71500 kg/m³ |
| 4 lb/in³ | = | 110719.62000 kg/m³ |
| 5 lb/in³ | = | 138399.52500 kg/m³ |
| 6 lb/in³ | = | 166079.43000 kg/m³ |
| 7 lb/in³ | = | 193759.33500 kg/m³ |
| 8 lb/in³ | = | 221439.24000 kg/m³ |
| 9 lb/in³ | = | 249119.14500 kg/m³ |
| 10 lb/in³ | = | 276799.05000 kg/m³ |
| 11 lb/in³ | = | 304478.95500 kg/m³ |
| 12 lb/in³ | = | 332158.86000 kg/m³ |
| 13 lb/in³ | = | 359838.76500 kg/m³ |
| 14 lb/in³ | = | 387518.67000 kg/m³ |
| 15 lb/in³ | = | 415198.57500 kg/m³ |
| 16 lb/in³ | = | 442878.48000 kg/m³ |
| 17 lb/in³ | = | 470558.38500 kg/m³ |
| 18 lb/in³ | = | 498238.29000 kg/m³ |
| 19 lb/in³ | = | 525918.19500 kg/m³ |
| 20 lb/in³ | = | 553598.10000 kg/m³ |
| 30 lb/in³ | = | 830397.15000 kg/m³ |
| 40 lb/in³ | = | 1107196.20000 kg/m³ |
| 50 lb/in³ | = | 1383995.25000 kg/m³ |
| 60 lb/in³ | = | 1660794.30000 kg/m³ |
| 70 lb/in³ | = | 1937593.35000 kg/m³ |
| 80 lb/in³ | = | 2214392.40000 kg/m³ |
| 90 lb/in³ | = | 2491191.45000 kg/m³ |
| 100 lb/in³ | = | 2767990.50000 kg/m³ |
| 200 lb/in³ | = | 5535981.00000 kg/m³ |
| 300 lb/in³ | = | 8303971.50000 kg/m³ |
| 400 lb/in³ | = | 11071962.00000 kg/m³ |
| 500 lb/in³ | = | 13839952.50000 kg/m³ |
| 600 lb/in³ | = | 16607943.00000 kg/m³ |
| 700 lb/in³ | = | 19375933.50000 kg/m³ |
| 800 lb/in³ | = | 22143924.00000 kg/m³ |
| 900 lb/in³ | = | 24911914.50000 kg/m³ |
| 1000 lb/in³ | = | 27679905.00000 kg/m³ |
How to Convert LB/IN³ to KG/M³ (Pound/cubic inch to Kilogram/cubic meter)?
We can convert pound/cubic inch to kilogram/cubic meter by using an example.
Example:
Convert 20 Pound/cubic inch to Kilogram/cubic meter?
We know 1 Pound/cubic inch = 27679.9050000 kilogram/cubic meter; 1 Kilogram/cubic meter = 0.0000361 pound/cubic inch.
20 pound/cubic inch = ___kg/m³
20 × 27679.9050000 = 553598.10000 kg/m³ (we know 1 pound/cubic inch = 27679.9050000 kilogram/cubic meter)
Answer:
20 pound/cubic inch = 553598.10000 kilogram/cubic meter
Converting lb/in³ to kg/m³: Precision Metal Density Units
Pounds per cubic inch (lb/in³) is used in metal alloy specifications, CNC machining datasheets, and automotive part design where volumes are measured in cubic inches. The conversion factor to SI is large: 1 lb/in³ = 27,679.9 kg/m³. This dramatic scaling occurs because a cubic inch is a very small volume (only 1/61,024 of a cubic foot), concentrating mass into a tiny space.
- Start with the density in lb/in³.
- Multiply by 27,679.9 to convert to kg/m³.
- Alternatively: convert lb to kg (× 0.4536) and in³ to m³ (× 1.6387×10⁻⁵) separately.
- Verify: steel at 0.284 lb/in³ × 27,679.9 = 7,861 kg/m³ ✓.
Metal Alloy Densities: lb/in³ to kg/m³
Standard machining reference values from Machinery’s Handbook and material supplier datasheets:
| Pound/cubic inch | Kilogram/cubic meter |
|---|---|
| 0.098 lb/in³ | 2,713 kg/m³ |
| 0.160 lb/in³ | 4,429 kg/m³ |
| 0.284 lb/in³ | 7,861 kg/m³ |
| 0.289 lb/in³ | 8,000 kg/m³ |
| 0.322 lb/in³ | 8,913 kg/m³ |
| 0.410 lb/in³ | 11,349 kg/m³ |
| 0.066 lb/in³ | 1,827 kg/m³ |
| 0.697 lb/in³ | 19,297 kg/m³ |
Worked Examples: lb/in³ to kg/m³
Question 1: An automotive brake rotor is made from gray cast iron at 0.264 lb/in³. Convert to kg/m³ for thermal simulation.
Solution:
Density in kg/m³ = lb/in³ × 27,679.9
= 0.264 × 27,679.9
= 7,308 kg/m³
Answer: 0.264 lb/in³ = 7,308 kg/m³ for gray cast iron brake rotors.
Question 2: Inconel 625 (used in jet engines) has a density of 0.305 lb/in³. Express in kg/m³.
Solution:
Density in kg/m³ = lb/in³ × 27,679.9
= 0.305 × 27,679.9
= 8,442 kg/m³
Answer: 0.305 lb/in³ = 8,442 kg/m³ for Inconel 625 superalloy.
Question 3: A CNC programmer needs the density of 7075-T6 aluminum (0.101 lb/in³) in kg/m³ for weight estimation software.
Solution:
Density in kg/m³ = lb/in³ × 27,679.9
= 0.101 × 27,679.9
= 2,796 kg/m³
Answer: 0.101 lb/in³ = 2,796 kg/m³ for 7075-T6 aluminum.
Practice: lb/in³ to kg/m³
Try solving these on your own to test your understanding:
- Convert 0.253 lb/in³ (zinc die-cast) to kg/m³. (Answer: 7,003 kg/m³)
- Express 0.298 lb/in³ (nickel 200) in kg/m³. (Answer: 8,249 kg/m³)
- Beryllium copper at 0.297 lb/in³ in kg/m³. (Answer: 8,221 kg/m³)
- Tungsten at 0.697 lb/in³ — convert. (Answer: 19,291 kg/m³)
- PEEK polymer at 0.047 lb/in³ in kg/m³. (Answer: 1,301 kg/m³)
Why Machinists Use lb/in³
In CNC machining and tool design, part dimensions are specified in inches and weights in pounds. A machinist calculating the weight of a turned part (e.g., a 4-inch diameter × 6-inch cylinder) works naturally in cubic inches: V = πr²h = π(2)²(6) = 75.4 in³. For steel (0.284 lb/in³): weight = 75.4 × 0.284 = 21.4 lb. This avoids intermediate unit conversions during manufacturing.
Automotive Lightweighting and Material Density
Automotive engineers compare lb/in³ values when substituting materials for weight reduction. Replacing a steel bracket (0.284 lb/in³) with aluminum (0.098 lb/in³) cuts weight by 65%, while switching to magnesium (0.066 lb/in³) saves 77%. When feeding these values into FEA crash simulations (which use SI units), the conversion to kg/m³ must be precise to predict deformation behavior correctly.
Key Takeaways
- 1 lb/in³ = 27,679.9 kg/m³.
- Metal densities in lb/in³ are small decimals (typically 0.06–0.70).
- Standard unit in US machining, casting, and automotive specifications.
- Multiply by ~27,680 to get familiar SI density values.
- Critical for converting CNC data to FEA simulation inputs.
Pound/cubic inch to Kilogram/cubic meter Conversion Formula
kilogram/cubic meter = pound/cubic inch × 27679.9050000
1 pound/cubic inch = 27679.9050000 kilogram/cubic meter
1 kilogram/cubic meter = 0.0000361 pound/cubic inch
Reverse: pound/cubic inch = kilogram/cubic meter × 0.0000361
Frequently Asked Questions
How many kilogram/cubic meter are in 1 pound/cubic inch?
There are 27679.9050000 kilogram/cubic meter in 1 pound/cubic inch. To convert pound/cubic inch to kilogram/cubic meter, multiply the value by 27679.9050000.
How do I convert pound/cubic inch to kilogram/cubic meter?
Multiply your pound/cubic inch value by 27679.9050000 to get the equivalent in kilogram/cubic meter. For example, 5 pound/cubic inch = 5 × 27679.9050000 = 138399.52500 kilogram/cubic meter.
How do I convert kilogram/cubic meter to pound/cubic inch?
Multiply your kilogram/cubic meter value by 0.0000361 to get the equivalent in pound/cubic inch. Alternatively, divide by 27679.9050000.
What is 10 pound/cubic inch in kilogram/cubic meter?
10 pound/cubic inch is equal to 276799.05000 kilogram/cubic meter.
What is 100 pound/cubic inch in kilogram/cubic meter?
100 pound/cubic inch is equal to 2767990.50000 kilogram/cubic meter.