By a Merchandising Expert · 8 min read · Inventory Management
Sell through rate is one of the most telling numbers in retail. It tells you how much of your inventory sold within a given period — and what that says about your pricing, buying, and demand forecasting.
What is sell through rate?
Sell through rate (also written as sell-through rate or STR) measures the percentage of inventory sold over a defined period compared to the total inventory received. It is a foundational retail KPI used by buyers, planners, and merchandisers to evaluate product performance and make smarter restocking decisions.
A high sell through rate signals strong consumer demand and lean inventory management. A low rate indicates slow-moving stock — which can lead to markdowns, increased carrying costs, and reduced cash flow.
The Formula
Expressed as a percentage. The "units received" figure typically includes both opening inventory and any new units added during the period.
Example: A clothing retailer receives 400 units of a new jacket style at the start of the season. By season end, 280 units have sold. The sell through rate is (280 ÷ 400) × 100 = 70%.
Why sell through rate matters for your business
Sell through rate is not just a backwards-looking stat — it is an active decision-making tool. Businesses use it to:
- Identify which products are performing and which are stagnating before markdowns become unavoidable
- Negotiate better terms with suppliers by backing reorder decisions with hard data
- Improve cash flow by reducing capital tied up in slow-moving inventory
- Inform seasonal buying decisions with historical STR data by category or SKU
- Reduce the need for deep discounting at season’s end, protecting margin
“Retailers who track sell through rate weekly rather than monthly have meaningfully more time to course-correct before markdowns are forced.”
What is a good sell through rate?
There is no universal benchmark, a 100% sell-through means you sold everything which is theoretically perfect, but often a sign you under-bought and left revenue on the table. A 20% sell-through means 80% of your inventory is still sitting, tying up capital and risking markdowns. The “ideal” rate depends heavily on your category, margin structure, and strategy. Let’s look at how it plays out across three very different retail contexts.
Seasonal apparel — women’s outerwear
A mid-market clothing retailer receives 1,200 units of a winter parka in October. By the end of January — the end of the winter selling season — they’ve sold 780 units.
At first glance, 65% looks acceptable. But in seasonal fashion — where merchandise has a hard expiry date — the industry benchmark is 80–85% at full price before markdowns begin. This retailer is already in markdown territory.
The remaining 420 units will likely be cleared at 30–50% off, compressing margins significantly. The buyer needs to investigate: was this the wrong silhouette? Wrong colourway? Did competitors over-promote? The STR flags the problem — understanding root cause drives better next-season buying.
Merchandising action: Initiate a 20% promotional markdown on remaining units by February 1st. Flag the style for reduced depth next season and review sell-through by colourway — neutrals likely outperformed fashion colours.