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# Marketing budget allocator

Splits a total budget across channels and months from fixed, target-volume-times-CPA and percentage-share rules with seasonality weights, using largest-remainder rounding so rows and columns sum to the cent.

Add a channel rule line to build the plan.

Fixed amounts and volume-times-CPA lines fund first; percentage lines share what is left, in proportion, scaled down when the shares pass 100 %. Month splits use largest-remainder rounding, so every row and column sums to the cent. Commitments larger than the budget leave the percentage lines empty and the unallocated figure negative, which is a real state worth seeing, not an error. Constant cost-per-result estimates are straight-line: they do not model diminishing returns on big spend increases. Everything is computed in this tab; nothing is uploaded.
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