Before reordering wholesale press-on nails, reconcile the sets you received, sold and still have, then compare designs over the same selling window. A high sell-through percentage alone is not a purchase quantity. It can hide a tiny starting order, a stockout, a promotion or stock that is physically present but unavailable to customers.
This guide is for retailers reviewing an existing collection. The first-assortment guide covers what to buy initially; the reorder checklist covers what to send a supplier. Here, the task between those steps is deciding whether the sales evidence supports another order.
Keep the unit and review window fixed
Use complete retail sets, not individual nail pieces, parcels, orders or website visits. If a bundle contains two separately stocked sets, record which underlying designs left inventory. Do not count one bundle as one set in one report and two sets in another.
Keep different shapes, size assortments and package versions identifiable. Two products with the same color name may serve different customers. Pooling them can conceal the version that needs attention.
Record the start date, end date, timezone, channel and location. For a first test, choose a review window you can document consistently; there is no universal number of days that proves demand. Note each design's launch date and any days it could not actually be purchased.
Reconcile stock before calculating a percentage
Keep a physical movement record separate from your sales report. A useful stock check is:
Opening physical sets + received sets + returned physical sets + transfers in - dispatched sales sets - transfers out - documented non-sale removals = closing physical sets.
Non-sale removals might include sets given away or discarded. Record the reason. A missing set is not automatically a sale. Likewise, a refund does not prove that a set returned to stock. Match actual movements to the relevant order or adjustment record.
Then split closing physical stock into available-to-sell sets, committed sets awaiting dispatch, and held sets. Use non-overlapping categories. Incoming goods are separate until received. This operational worksheet is not a replacement for your platform's accounting or inventory definitions.
For example, suppose a test starts with 40 sets. You dispatch 18, receive one returned set and give away two. Closing physical stock is 40 - 18 + 1 - 2 = 21 sets. If the return is held for inspection and the other 20 sets are available, the figures are 21 physically present and 20 available. Do not quietly classify the held return as a sellable unit.
All numbers in this guide are invented arithmetic examples, not SENAILGLOBAL customer results, MOQ, pack quantities or recommended order sizes.
Name the denominator you are using
Sell-through percentages need a definition. Shopify's inventory report documentation defines sell-through as units sold divided by units sold plus ending inventory. It also explains that its quantity-sold field does not include adjustments such as returns or transfers. Read the report's current dates and stock definitions before comparing it with a separate spreadsheet.
For a clean, single-delivery test with no adjustments, that formula is straightforward. Suppose you receive 40 sets, sell 18 and have 22 left: 18 / (18 + 22) = 45%. If another 20 sets arrive before the period ends, with no further sales, ending stock is 42 and the same calculation becomes 18 / (18 + 42) = 30%.
The lower percentage does not mean sales reversed. The denominator changed. Record replenishment dates instead of comparing these two percentages as if they described identical stock exposure.
For the earlier example with a return and giveaways, keep the movement reconciliation beside the platform result. Do not force both reports to agree by changing the meaning of units sold. Check how your system handles fulfillment, refunds, exchanges and adjustments first.
Compare availability, not only calendar days
A design that sold out halfway through a test did not have the same opportunity to sell as a design available throughout it. Record both calendar days and days when customers could buy the item in the channel being reviewed.
Consider two hypothetical designs reviewed over 28 days:
- Design A starts with 20 sets, sells all 20 during its first 10 available days, then remains unavailable for 18 days.
- Design B starts with 60 sets, sells 28 and remains available for all 28 days, leaving 32 sets.
A has 100% sell-through and B has about 46.7%, under the simple no-adjustment calculation. Yet B sold more sets. A's observed pace while available was 2 sets per day; B's was 1. These observations answer different questions.
Do not multiply A's pace across the missing 18 days and call the result lost sales. Customer demand after the stockout was not observed. A promotion, a live-selling session or a one-off event could also have concentrated those sales. Record those conditions and consider another bounded test before scaling.
Use stock cover as a scenario, not a delivery promise
For your own planning worksheet, divide available-to-sell sets by an explicitly defined daily selling pace. In the example, B has 32 available sets and an observed pace of 1 per day, giving 32 days of illustrative cover if that pace continues. This is a scenario, not a forecast or a supplier lead time.
If there are no sales, leave cover unresolved rather than showing a comforting number. If all sales came from one promotion, calculate a separate ordinary-selling scenario. Keep unreceived purchase orders visible, but do not add them to today's available stock.
Ask the supplier to reconfirm availability and the expected dispatch and delivery arrangements. Compare those assumptions with the remaining selling window. A seasonal design may no longer justify replenishment by the time it can arrive, even when its earlier sell-through looked strong.
Decide repeat, investigate or hold
Use three decisions with a written reason, rather than an automatic percentage threshold:
- Repeat for quotation: sales continued across comparable selling days, usable stock is running down, and the design still fits the forthcoming selling window.
- Investigate first: the item had limited display time, incomplete photographs, unusual discounting, fit questions or unresolved returns. Identify the problem before changing the quantity.
- Hold further buying: current inventory remains sufficient for your chosen scenario, or the timing and evidence do not support another commitment.
Check actual selling prices, discounts and product and delivery costs separately. Fast stock movement does not establish profit. Nor does a low sales count establish poor workmanship: availability, presentation and customer fit may be different issues.
For unresolved delivery discrepancies, use the receiving checklist. Keep that review distinct from a demand decision so held goods do not appear to be slow-selling available stock.
A review record that leads to a useful quote
Keep one record per design with these fields:
- Design reference, shape, size assortment and retail-set contents.
- Review dates, timezone, channel and location.
- Opening stock, receipts, sales movements, returns, transfers and non-sale adjustments.
- Closing physical, available, committed and held quantities.
- Platform report name, sell-through definition and reporting dates.
- Days available, stockout dates and promotion or display changes.
- Decision, supporting evidence and uncertainties.
- Proposed reorder quantity, specification changes and target arrival window.
The supplier needs the resulting design quantities and specifications, not your customers' identities or raw transaction history. Send only the business summary needed to review the request.
At SENAILGLOBAL, existing-design availability and proposed mixed quantities require confirmation. New custom designs follow a separate route starting at 100 sets per design; packaging minimums and shipping are separate quote questions. A calculated replenishment need does not override those conditions or prove that an unchanged style is in stock.
Check current designs and request an existing-design quote. If your review points to a different shape or finish, discuss a design sample before treating the revised product as a continuation of the old test. For branded presentation changes, use the private-label page.
Sources and scope
Reviewed 11 November 2026. The linked Shopify documentation supports its platform-specific formula and reporting definitions. The reconciliation method, examples and decision record above are editorial planning aids, not an automated purchasing rule. Current SENAILGLOBAL order conditions are available on the catalog and private-label page. No sales benchmark, demand forecast or replenishment deadline is promised.