FREE WEB TOOL

Multi-day inventory split planner

Split total inventory across event days using custom weights.

Use tool

How to use it

Split a whole inventory count across days according to custom positive weights. Fractional allocations are converted back to whole units while keeping the final total equal to the entered stock.

  1. Enter total stock as a whole number of 0 or more.
  2. Enter one positive weight per day, one per line.
  3. Calculate and review each day’s whole-unit allocation and the final total.
Share
each weight ÷ sum of all weights
Initial allocation
whole-number part first
Remainder
extra units go to the largest fractional remainders
Total
matches the entered stock

120 units with weights 45 / 35 / 20 becomes 54 / 42 / 24

Because the weights already sum to 100, they act like 45%, 35% and 20%. The resulting whole-unit split is 54 / 42 / 24, totaling 120.

Weights do not need to add up to 100. Values such as 4 / 3 / 2 work as relative weights too. The tool allocates a known stock total; it does not predict demand or attendance.

Remainders are handled with a largest-remainder style approach

The calculation first assigns the whole-number part of each ideal allocation, then gives leftover units to the largest fractional remainders so the total stays exact.

Weights are relative, not necessarily percentages

45 / 35 / 20 and 9 / 7 / 4 represent the same proportions after normalization.

Exact ties can depend on input order

When fractional remainders are exactly equal, earlier rows can receive the extra unit first. Review the final split when a one-unit difference matters operationally.

Demand forecasting is a separate decision

Choose the weights from expected visitors, historical sales or another planning assumption; this tool only turns those weights into whole inventory counts.

Zero stock is allowed

A stock total of zero simply produces zero allocations. Weight lines still need to be positive so the requested proportions are meaningful.

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