Calculate how quickly your resale inventory is turning into cash — using COGS, average inventory value, and your chosen period.
stokd connects every item, cost, sale, marketplace fee, source, and listing age so you can see which categories turn cash fastest — free for your first 25 items.
Inventory turnover = COGS ÷ average inventory value. For resellers, COGS means the cost basis of items that sold during the period. Average inventory value is beginning stock cost plus ending stock cost, divided by two.
This is different from a sell-through rate. A sell-through rate tells you what percentage of units moved. Turnover tells you whether your cash is cycling back into the business or sitting in unsold inventory.
Check turnover by platform, source, and category. eBay electronics, Poshmark clothing, Whatnot lots, and sneaker pairs can all have different healthy velocity ranges.
If turnover is falling while ending inventory value is rising, you are probably sourcing faster than you sell. Pair this calculator with the reseller inventory aging tracker and sell-through rate guide to find the specific stale items slowing the business down.
Monthly is enough for most small resellers. A weekly check can be noisy unless you list and sell high volume. Use a consistent period so you can compare the trend over time.
Use cost basis for inventory turnover. Gross sale price belongs in profit margin and ROI calculations. Turnover is about how quickly inventory cost cycles back into cash.
You can still use turnover. Instead of tracking a single SKU, group items by category, source, platform, or age band. The goal is to see where cash moves fastest and where it gets stuck.
stokd stores each item's purchase cost, source, platform, sale, fees, shipping, profit, and listing age. That makes turnover, stale stock, and category performance easier to monitor without rebuilding formulas in a spreadsheet.