I though of some simple examples, This is based on what I understood
from your equations.
Calculation A
• What is the percentage of pallet allocation per category.
( September 2007 to September 2008)
This you get by doing the next two.
• How long the pallet was in the reserve location by category.
Just make a list of all the pallets in your warehouse. If
you know access, it will make it easier. Unless you have less than
50,000 pallets it, you wont be able to use Excel. So for instance you
have this data.
---- Ribeye, Pallet: 100051, Meat, 5 days.
---- Toothpicks, Pallet 100100, Daily, 2 days.
---- NY Steak, Pallet 200321, Meat, 3 days.
---- Cuttingboard, Pallet 100129, Accesorie, 15 days.
---- Ribeye, Pallet: 100052, Meat, 4 days.
---- Knife, Pallet: 150150, Accesorie, 13 days.
You do this for every pallet.
• Take an average number of days for each category.
Here you summarize the data by category. So you say based on the
sample data above: Meat category averages 4 days. Daily averages 2
days. Accesorie averages 14 days. This answers part 1.
Calculation B
• Take the warehouse cost (p&l) divided by the total number of
pallets
spaces for the whole dc.
Say your warehouse cost is about $100,000 a Year. Say your
warehouse can fit a maximum of 5,000 Pallets (count the spaces in the
racks and bulk). 100,000/5,000 = $20 per Pallet per Year.
• Divide the answer by 365 days.
$20/365 = $0.0548 per Pallet per Day.
• Times the answer with your category average. ( number of days)
=
bucket cost.
Meat: $0.0548 x 4 = $0.2192 per Pallet
Daily: $0.0548 x 2 = $0.1096 per Pallet
Meat: $0.0548 x 14 = $0.7672 per Pallet
• X that answer by 7 for weekly cost……ect
If you multiply that answer by 7 you get weekly cost per
Pallet.
Multiply by 365 and you get the Year cost per pallet.
Divide the year cost by 12 and you get the monthly cost per
pallet.
So if in your feasibility report you want to introduce an extra
100 pallets of Meat per week into your warehouse, the cost of
warehousing that is $0.2192 x 7 x 100 = $153.44.
Some categories cost more than others and that is the key. Your
warehouse has a fixed space available, and when you introduce 100
pallets each week, you wont be able to use that space. So the cost
reflects that. In my example the accesorie category is the most
costly, so bringing more of those will Cost you more and it makes
sense because they stay longer in the warehouse and thus prevent you
from using that space on faster moving SKUs.
BTW anything that you store for 1 day, seems flawed and you should
consider crossdocking those items.
I hope that helps, Feel free to ask if you need any more help.
G. L.
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