Calculate mass from length or volume using density, or convert related length, mass, volume, torque and force-per-length units. kg denotes mass; kgf denotes force.

Use the measured mass per unit length.

Inches do not convert directly to kilograms. Use linear density or volume density. kg is mass; kgf is force.

Suggestions are example coefficients, not universal material values.

Watch the full explanation and transcript.

Inches ↔ Kilograms (Steel, 1 in² bar)
Inches to Kilograms Kilograms to Inches
1 in = 0.129 kg0.5 kg = 3.89 in
2 in = 0.257 kg1 kg = 7.77 in
3 in = 0.386 kg1.5 kg = 11.66 in
4 in = 0.515 kg2 kg = 15.54 in
5 in = 0.644 kg2.5 kg = 19.43 in
6 in = 0.772 kg3 kg = 23.32 in
8 in = 1.030 kg5 kg = 38.86 in
10 in = 1.287 kg7.5 kg = 58.29 in
12 in = 1.544 kg10 kg = 77.72 in
15 in = 1.931 kg12.5 kg = 97.15 in
18 in = 2.317 kg15 kg = 116.58 in
24 in = 3.089 kg20 kg = 155.44 in
30 in = 3.861 kg25 kg = 194.30 in
36 in = 4.633 kg30 kg = 233.16 in
48 in = 6.178 kg40 kg = 310.88 in
60 in = 7.722 kg50 kg = 388.60 in
72 in = 9.267 kg75 kg = 582.91 in
96 in = 12.355 kg100 kg = 777.21 in
120 in = 15.444 kg150 kg = 1165.81 in
240 in = 30.888 kg200 kg = 1554.42 in
Illustrative steel-bar table with cross-section = 1 in² and assumed linear density 0.1287 kg/in; verify the actual material density. Formula: Mass (kg) = Length (in) × 0.1287 kg/in; Length (in) = Mass (kg) ÷ 0.1287.

Kilograms from Inches Formula

kg = in³ × D

Variables:

  • kg is the Kilograms from Inches (kilograms)
  • in^3 is the cubic inches
  • D is the density (kg/in^3)

To calculate Kilograms from Inches, multiply the cubic inches by the density in kilograms per cubic inch.

How to Calculate Kilograms from Inches?

The following steps outline how to calculate the Kilograms from Inches.

  1. First, determine the cubic inches. 
  2. Next, determine the density (kg/in^3). 
  3. Next, gather the formula from above = kg = in^3 * D.
  4. Finally, calculate the Kilograms from Inches.
  5. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

cubic inches = 34

hypothetical density (kg/in^3) = 102; mass = 34 × 102 = 3468 kg

Frequently Asked Questions

What is density and how does it relate to calculating weight from volume?

Density is a measure of mass per unit of volume. It plays a crucial role in calculating mass (in kilograms) from volume (in cubic inches) because it allows you to convert a volume measurement into a mass measurement by multiplying the volume by the density.

Why is it important to convert cubic inches to kilograms?

Converting cubic inches to kilograms is important in fields such as shipping, engineering, and manufacturing where both volume and weight are crucial parameters for designing, shipping, and handling materials and products. It helps in estimating shipping costs, load capacities, and material requirements.

Can the formula kg = in^3 * D be used for any material?

Yes, the formula kg = in^3 * D can be used for any material, provided you know the material’s density in kg/in^3. The density value is specific to each material and is essential for accurately calculating the mass from a volume measurement.

How can inaccuracies in calculating kilograms from inches be minimized?

Inaccuracies can be minimized by ensuring accurate measurements of volume and density, using high-quality measuring tools, and double-checking calculations. Additionally, understanding the properties of the material and any potential factors that could affect its density (such as temperature or pressure) can also help in achieving more accurate results.