Sell-Through Rate Calculator
Calculate retail sell-through rate from units sold and inventory received.
Returns sell-through %, weeks of supply, and inventory health classification.
Sell-through rate measures how quickly inventory leaves the warehouse or shelf. Standard formula:
Sell-Through Rate = Units Sold / (Beginning Inventory + Units Received) × 100
Or simpler when measuring a specific delivery:
Sell-Through Rate = Units Sold / Units Received × 100
Calculated over a specific period — typically a week or month for fast-moving retail, a quarter for slower categories.
Reading the number.
- Below 40%: poor sell-through. Inventory is sitting. Markdowns, promotions, or returns to vendor likely.
- 40-65%: healthy for most retail. Inventory is moving but not at risk of stockout.
- 65-80%: strong sell-through. Demand is meeting or exceeding expectations.
- Above 80%: high sell-through. May indicate under-buying — could have sold more if you had stock. Stockouts cost sales.
These benchmarks vary widely by category. Fashion typically targets 60-75% in season; electronics targets 80-90% to avoid markdown risk; basic apparel (socks, basics) operates at 50-60% as a planned average.
The 80% trap. A sell-through over 80% sounds great, but if you sold out and turned customers away, the actual demand was higher than your inventory. Hitting 95% in week 1 of a product launch may mean you sold 100% of what you had but actual demand was 200% — you missed half of available revenue.
Worked example. A boutique buyer orders 200 units of a sweater. Three weeks in:
- Sold to date: 130 units
- Sell-through = 130 / 200 = 65%
- Sales rate: 130 / 3 = 43 units/week
- Weeks of supply remaining: (200 - 130) / 43 = 1.6 weeks
The buyer should reorder this sweater to maintain inventory through the season. If sell-through were 30% in three weeks (only 60 units sold), the conversation shifts to markdown timing — at 20 units/week the remaining 140 units would take 7 weeks to sell at full price, which probably misses the season window.
Sell-through and replenishment cycle. Modern fashion brands (Zara, H&M) target 80%+ sell-through every 4-6 weeks by reading early indicators and producing additional units of best-sellers. Traditional retailers buy a season’s worth upfront and accept lower sell-through — paying for it via end-of-season markdowns of 30-70%.
Sell-through vs Turnover. Both measure inventory speed but differently:
- Sell-through: % of a specific shipment sold in a period
- Turnover: how many times annual inventory is sold and replaced (Annual COGS / Average Inventory)
Sell-through is operational (per shipment / per SKU). Turnover is financial (annual / company-wide).
The relationship to gross margin. High sell-through usually correlates with healthy margins because you avoid markdowns. Industry studies show every 10-point drop in sell-through corresponds to roughly a 4-7 point gross margin compression due to markdown activity.
Sell-through as a forecast input. Buyers use early-week sell-through to project full-season performance. A product hitting 60% in week 1 of a 12-week season is on track for sellout by week 5 — needs reorder. A product at 5% in week 1 is heading for the markdown rack — start planning the discount cadence.
Common mistake: ignoring receipt timing. If 80% of an order arrives in week 1 and 20% in week 4, sell-through calculated against total order volume is misleading early in the period. Track sell-through against units actually available for sale at each point.