When production is getting planned for a brand-new product, the shipping weight is usually needed before the part is complete. Not only does the part have weight, but the packaging does as well. However, the packaging may have not been produced yet, so it’s not as simple as throwing it on a scale.
Here’s how you can calculate the weight of your foam part – before it’s even fabricated.Use the formula below to get a more concrete estimate for your shipping costs.
Foam Weight Calculation
To calculate the weight of your foam part, you need to use two metrics: calculate the volume of packaging in cubic feet, and then multiply the volume by density to get the weight. Put in one formula, it looks like this:
( Length x Weight x Height ÷ 1728 ) x Foam Density
The calculation will calculate the volume of the packaging in cubic feet. The parenthesis portion of the equation solves this. You can also use an online cubic feet calculator to make this process simpler.
Next, multiply the volume by the density to get the weight.
If you’re not sure what the density is of your foam, consult the spec sheet for your foam. That will provide density, typically in a lb/ft format.
Example Calculation
Let’s walk through the process with a hypothetical: how much does a set of four foam end caps weigh?
The graphic above shows a completed end cap
The graphic above shows a completed end cap. The end cap has two pieces of foam laminated together to make one part. Below is how we solve for the volume:
Step 1:
(12 x 12 x 4)/1728 = .33 lbs per cubic foot
Step 2:
.33 x 1.7 = .56 lbs per part
Each part weighs .56 pounds! Well, not so fast…. There is a section of foam (8” x 8” x 2”) that is missing from one of the layers, and that needs to be subtracted from the .56 lbs per part.
Step 3:
(8 x 8 x 2)/1728 = .075 lbs of foam would fill that cavity
Step 4:
.56 - .075 = .485 lbs per part
Don’t forget to multiply the number of parts per package if there are more than one!
Step 5:
.485 x 4 = 1.94 lbs
With this calculation, we can say that our set of four endcaps collectively weighs 1.94 lbs (.485 lbs per part).
This is about as far as hand calculations can be taken before CAD models are needed. When using custom foam profiles or molded parts, the hand calculating is nearly an impossible feat. However, if you partner with foam industries, we’ll provide a weight estimate for even the most complex customized parts.
Find Your Best Option with a Packaging Expert
As a leader in the packaging industry, Foam Industries has set the bar with an unwavering commitment to quality, exceptional client service, and constant innovation. Through our extensive inventory of endlessly customizable products, we ensure you find exactly what you’re looking for.
Foam Industries is a custom protective packaging company specializing in foam – with additional wood and plastic fabrication services. Our custom foam fabrication services are ideal for any type of packaging, display, or support service needed – from design to finished product.
