Triangle kanban, one of three types of signal kanban, is unique in that there is only a single kanban per part number or stock-keeping unit. Accordingly, kanban-sizing math has nothing to do with determining the number of kanban; that’s obviously fixed.

Instead, the math is focused on determining the total manufacturing lot size, which is the total kanban size, and the appropriate replenishment trigger point or reorder point. The reorder point is addressed in a separate entry by the same title.

There are two basic methods of sizing triangle kanbans. We will call these:
1. Product-specific lot size
2. Universal lot size

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