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.
Per-period profit at new price
Calculate current and proposed contribution per sale from selling price minus the direct per-sale cost entered. Multiply each by its matched sales volume to compare total contribution before fixed costs. Any sales-drop percentage is an owner-entered scenario, not a forecast of customer response.
Break-even threshold
When current and proposed contribution per sale are both positive, reverse-solve the proposed sales volume that leaves the same total contribution as today. The difference from current volume is the mathematical sales-volume boundary. If either side is non-positive, the calculator reports the signed unit economics instead of inventing a normal positive boundary.
