in3 to lb – cubic inches to pounds – mass to volume online

Volume in cubic inches (in³, cu in):

Density in

Mass (weight) in pounds (lb):


Density of some materials:

  • Air ≈ 0.000043 lb/in3
  • Aluminum ≈ 0.0975 lb/in3
  • Concrete ≈ 0.0867 lb/in3
  • Diesel ≈ 0.0307 lb/in3
  • Gasoline (petrol) ≈ 0.02565 lb/in3
  • Steel ≈ 0.2836 lb/in3
  • Water (4°C) ≈ 0.03613 lb/in3

How to convert from in3 to lb?

The mass (weight) in pounds is equal to the volume in cubic inches multiplied by the weight in pounds per cubic inch.


m = V x p

mmass (weight) in pounds (lb);

V – volume in cubic inches (in3, cu in);

ρ – density in pounds per cubic inch (lb/in3, lb/(cu in), lb in-3).



Convert 2768 in3 to lb if the density is 0.03613 lb/in3.

Solution: m = V x p = 2768 x 0.03613 = 100 lb. Answer: 2768 in3 = 100 lb (density = 0.03613 lb/in3)

In this calculator, density can be entered in the following units (click on density unit):

  • kilogram per cubic meter (kg/m³, kg/(cu m))
  • tons per cubic meter (t/m³, t/(cu m))
  • grams per milliliter (g/mL)
  • grams per cubic centimeter (g/cm³, g/(cu cm), g/cc)
  • pound per cubic inch (lb/in³, lb/(cu in))
  • pound per cubic foot (lb/ft³, lb/(cu ft), lb/(cf))
  • pound per US liquid gallon (lb/US gal)
  • ounce per cubic inch (oz/in³, oz/(cu in))
  • ounce per cubic foot (oz/ft³, oz/(cu ft))
  • slug per cubic foot (slug/ft³, slug/(cu ft), slug/cf)