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Try Our Dimensional Weight Calculator

Calculating Dimensional Weight

Make a copy of our calculator and type in your own values here:

Dimensional weight since Amazon is basing the FBA fee off of item weight or dimensional weight whichever is greater – dimensional weight is easy to calculate but people just make it way too confusing – it’s simply:

L x W x H = X


Divide X by 139 to get Y


Round to the next whole LB (lot of ppl miss this part) – this is the weight that is used to calculate the FBA fee if using dimensional weight.

So How Do We Use This Info?

You work backwards to figure out if you can reduce your FBA fee by shrinking your dimensions slightly.

For example: If you have a product that weighs 2-3lbs but has the dimensions 16 x 9 x 3, your dimensional weight is 3.11 lbs (16*9*3 = 432 / 139 = 3.11) and because of that .11 lbs of extra dimensional weight, you’re bumped up to 4 lbs and the next pricing tier from $5.79 to $6.43 or $.64 more per unit or an 11% increase in fees.

So what do you do? You have to determine whether it’s reasonable that you can shrink your dimensional weight to 3 lbs or less by slightly reducing your dimensions L x W x H to equal less than 417 (which is just 139 * 3).

If you can shave just 1 or 2 inches off like 15.9*8.9* 2.8 = 396 / 139 = 2.85 lbs = bumped up to 3 lbs not 4 – note dimensional weight is a factor in calculating your storage fees too.

NOTE: 18 x 14 x 8 is the Standard Size and if you exceed these dimensions, you’re going to go into Small Oversized where the math is slightly different.

Sometimes people want to know when they sent in a particular SKU last, how many units were shipped in, etc. But they think the only way is to go through the FBA shipments and find the last shipment for that SKU.

It’s Much Easier and Faster Doing This:

Reports > Fulfillment > Under Inventory > Received Inventory > simply enter SKU and filter to date range wanted. It will identify all of the FBA shipments into the FC for that particular SKU

How To See Your Estimated Monthly Storage Fees For Next Month:

Reports > Fulfillment > Manage Inventory Health > in one of the very far right columns it gives you this amount. Momstir’s estimate for November is $3164 right now.

This is a good thing to know especially right now in the 4th qtr. This report also tells you ways that you can reduce your storage fees by doing certain things.

I was fortunate to be part of MAG's first batch of its Advertising Internship Program. The timing was perfect for me as I was looking for an opportunity to learn more about Amazon PPC and at the same time to have hands-on training to work on accounts.Β Β 


When I started my internship, I listed down the things I wanted to learn. And I am happy to say that I've ticked all the boxes! My most favorite was "Optimization Using Bulk Files”. Bulk files and I, we did not get along at first, it was so scary seeing all those data! But I had a great mentor who guided me along the way. He patiently taught me step by step on how to process the data. He was very enthusiastic in answering all of my questions. He supported me until I gained the confidence in uploading my first, second, third (and so on) bulk uploads.Β 


The biggest advantage in working with MAG (and I must say one thing that I always look forward to every week) is its Weekly Ads Training. Every week, we discuss various topics about PPC. Interns/Ads Specialists/Ads Managers, we all share knowledge, information, and updates about PPC. During our discussions, we exchange ideas and feedback. It became an avenue not just to learn a skill, but also to clear any vague or ambiguous PPC topics.Β 


For me, the biggest disadvantage is the work schedule. As an Intern, I have to follow EST timing. The time difference from my location was only 8 hours, but being a morning person, I really struggled to keep myself awake. But if you are a night owl, then this will not be a problem for you.


So if you are considering joining the MAG Advertising Internship Program, my advice to you is to take action - APPLY NOW! The knowledge that you will gain and the skill that you will develop from this program will be invaluable. And who knows? From being an Intern, you might be the next one to be promoted as Jr. Ads Specialist!Β 

Maria Victoria Piedad