Inventory Turnover Calculator

How to use the inventory turnover calculator

1. Cost of items sold in the period. Add up what you paid for every item that sold, including delivery to you and cleaning or repair. COGS for resellers settles what else belongs there.
2. Inventory value at start (at cost) and Inventory value at end (at cost). Everything you own and haven't sold: listed, waiting for photos, or still in the bag from the lumpeks.
3. Length of the period (days). Use the same dates for all three numbers.

The currency selector changes the label only.

The turnover formula with cost of goods

The calculator runs exactly this:

Turnover covers your period only. To compare a 90-day result with a yearly figure, multiply by 365 ÷ 90.

Now say those items sold for 4,400 zł. Dividing that by stock at cost gives 2.0 and 45 days: your markup hides a month of waiting.

Average inventory value for one-off items

You have one of each item, so value each at its own cost:

• Lots. Split the lot price across the pieces and keep that split. Example: a 300 zł bag of 10 pieces is 30 zł each.
• Unlisted stock. A pile waiting for photos ties up cash too.
• Returns and write-offs. A return goes back into stock; an item you bin leaves stock but isn't a sale.
• Uneven buying. Two snapshots miss a big haul bought mid-period. Take stock value at the end of each month, average those yourself, and enter that figure in both the start and end fields.

The inventory and profit tracker spreadsheet has buy date, cost and sale date columns, so a monthly snapshot is a filter, not a count.

Turnover in days

Days to sell inventory blends all your stock, so quick sellers can hide a coat that has sat for five months. For per-item timing, measure your own days to sell on Vinted.

• If days rise period after period while cost of items sold stays flat, stock is ageing. Find the categories behind it before buying more of them, and use the exits for unsold inventory for pieces markdowns haven't moved.
• If turnover rose because of deep markdowns, check ROI for the same period before celebrating: profit can fall.
• Before buying into a slow category, check resale demand on comparable listings.

Turnover and cash flow

Turnover says how fast cash cycles; ROI on cost says how much each cycle earns. Together:

Example: in the quarter above, a 50% ROI gives 2,200 × 1.2 × 0.5 = 1,320 zł. Now aim for 2,000 zł profit per 90 days:

Before adding about 1,130 zł of stock, ask whether turnover or ROI is easier for you to move.

Stock is not the whole bill. A sold item's cost leaves stock at the sale, but its money arrives later:

Add that gap to the stock figure. Example: 2,640 zł of cost a quarter is about 29 zł a day; say money takes 10 days from sale to bank, and about 290 zł more is out at any time. If you sell as Vinted Pro in the UK, orders auto-complete after 14 days unless the buyer raises an issue, so use a longer gap. Our sources don't say how long OLX's transfer takes after the payout order.

Setting your own turnover target

This page gives no "good" turnover number: we found no source that measures it reliably for resellers. Set the target from your own limits instead:

If your actual turnover is below the target, look at the categories with the longest days first, not at your whole stock.

Turnover vs sell-through rate

If sell-through holds while turnover falls, cheap pieces are moving and expensive ones sit. The sell-through rate calculator covers the item side; the inventory management guide for resellers shows what to record so both come from one log.

Common mistakes

• Dividing sales revenue by stock at cost
• Reading a 90-day turnover as a yearly one
• Leaving unlisted stock out of inventory value
• Taking start and end snapshots either side of one big haul
• Judging all stock by one blended days figure