Sell-Through Rate and Stock Cover Calculator
See what share of your available stock sold in a period, how fast it is selling and how long what is left will last. Add the supplier's lead time to see whether a reorder is due.
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Questions
- How do you calculate sell-through rate?
- Sell-through rate = units sold ÷ units available in the period × 100, where units available is opening stock plus units received during the period. Selling 300 of 400 available units is a 75% sell-through.
- What is stock cover?
- Stock cover, also called days or weeks of supply, is how long your current stock will last at the recent sales rate: units on hand ÷ average daily sales. Divide by 7 for weeks of cover.
- What is a good sell-through rate?
- It depends on the period and the product. For seasonal or fashion stock you might aim to sell most units within the season; for items you always keep in stock, a very high sell-through can mean you are running too lean. Track it per SKU over the same period length.
- Why does sell-through matter on marketplaces?
- Slow moving stock costs storage and ties up cash. On Amazon, stock stored for a long time can add aged inventory surcharges, and stock that is low compared with sales can trigger a low inventory level fee. Watching sell-through and cover together helps you stay between the two.
- Should I use the last 30 days or a longer period?
- A recent period reacts faster to change; a longer one smooths out noise. If sales are trending or seasonal, compare both, and avoid periods with stockouts, because days with no stock understate demand.