Detailed view
How this calculator works
The answer does not change between Quick and Detailed. This is the professional finance underneath it — the formula, assumptions and mechanics you can inspect when you want the extra detail.
Amount left per sale
For each price, subtract the direct per-sale cost entered by the owner. Multiply that amount by monthly sales volume to compare the direct contribution before wages and other costs.
Break-even demand boundary
The calculator reverse-solves the sales volume at the new price that leaves the same total direct contribution as today. The difference from current volume is the maximum mathematical volume drop before the price change leaves less contribution than today. It is a boundary, not a forecast of customer behaviour.
