Enter the details you know. Optional advanced fields are kept separate so the main calculation stays easy to use.
How to use this calculator
- Enter your regular price and per-item costs.
- Set selling fees and typical quantity sold without a discount.
- Compare three discount rates and inspect the additional unit volume needed to match baseline profit.
How the estimate works
Gross sales alone do not tell you which discount is best. Compare contribution profit per item and the extra unit volume needed to preserve profit.
The calculator holds inventory cost and fixed per-item costs constant. It does not forecast how many customers will respond to a discount, so use actual sell-through history where available.
Frequently asked questions
Why can a small discount require many extra sales?Because each discounted unit contributes less profit, so more units must be sold to reach the same total profit.
What if profit per item becomes negative?Selling more at that price would deepen the loss under the entered assumptions. Recheck costs, fees, or the discount level.
Does a discount always increase sales?No. Buyer response depends on demand, item condition, season, presentation, and price history.
What counts as fixed cost per item?Use costs that are allocated per sale, such as packaging or a consistent overhead allocation. Avoid double-counting expenses.
Can I use this for estate-wide markdowns?Yes for a quick unit-level comparison, but a full estate-sale schedule should also model quantities and daily sell-through.