Kanban CalculatorElement Order lead-time Transit lead-time
Internal lead-time Container qty Daily demand Daily demand
variation Reorder/lot size Total Leadtime Daily demand + Variation
(95% Service Level) Fill-in 4 3 0 200 123 10 600 7 143 Element
Description Time to place and acknowledge order Supplier delivery
time Production or movement from stores Number of parts per each
container Average of at least 3 months 1 standard deviations of
demand Purchased or Make
These should all be in same units of time, generally in days
Equivalent to Kanban size These should all be in same units,
generally pieces
# Kanban CardsMax Qty on Hand # Days on Hand Board Area
Indicator
51000 8.1 # Cards
Green Yellow Red
3 1 1
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Calculator
The first step is to understand how theparts are packed. Kanban
quantity is a multiple of the pack quanitity;pack quantity has to
be consistent. The simplest Kanban is similar to a two-bin system,
2 card, one for each of the 2 containers, boxes, etc. The key is to
understand how long it take to replenish each part. Pay attention
for any additional frieght charges for more frequent shipments. You
need to have enough Kanbans in the system to cover replenishment
lead-time. *Parts with quality defect history are bad choices for
Kanbans Using the Kanban Calculator, enter the information into the
appropriate yellow boxes. The output in number of cards and max
inventory is shown below: Number Kanban Cards 5 Kanban size 200
units Max inventory 1000 units *Number of cards should be
recalculated when demand, lead time, or lot size changes. The
calculation is an estimate.