Sell Through Rate Calculator

What sell-through rate measures in retail

Sell-through rate (STR) is the percentage of starting inventory that sold during a measured period. Retail buyers, brand managers, and warehouse teams use it to judge whether a product launch, seasonal buy, or replenishment order is moving at the pace they planned.

Enter starting inventory and units sold to find the sell-through percentage, or switch modes to solve for units sold or the inventory level needed to hit a target rate. Optional wholesale cost and retail price inputs add gross sales and margin context. For dollar-based inventory velocity across an accounting period, pair results with the inventory turnover calculator. To evaluate gross profit return on inventory dollars, use the GMROI calculator. When planning promotional pricing to clear slow movers, compare outcomes with the markdown calculator.

Sell-through rate formula

Starting inventory is the quantity on hand at the beginning of the period you are measuring, such as the first day of a month or the day a new shipment lands in the store. Units sold counts every unit that left inventory through customer purchases during that same window.

Reverse calculations

Rearranging the formula helps buyers size initial orders. If you expect to sell 350 units at a 70% target rate, you need about 500 units in starting inventory. If you start with 250 units and sell 175, the sell-through rate is 70%.

Worked example

A boutique receives 250 units of a new jacket at the start of the season and sells 175 units over eight weeks. The sell-through rate is (175 / 250) x 100 = 70%. With a wholesale cost of $15 and a retail price of $40, gross sales on sold units are $7,000, cost of goods sold is $2,625, and gross profit is $4,375 (62.5% margin on revenue).

How to interpret sell-through benchmarks

Healthy sell-through depends on product type, price point, and season length. Fast-fashion and short-life collections often target weekly or monthly rates well above 50% early in the season. Evergreen staples may show lower rates by design because safety stock stays on the shelf. A rate below 20% on a finite seasonal buy often signals over-ordering or weak demand, while rates above 80% may mean you risk stockouts unless replenishment is fast.

• Compare similar SKUs within the same category rather than one universal target.
• Track trends week over week; a flat 40% rate on week one can be fine if velocity accelerates after marketing.
• Pair unit-based sell-through with margin data so high velocity on low-margin items does not mask profit problems.

Sell-through rate vs inventory turnover

Sell-through rate is a unit-based KPI for a specific product or buy over a short window. Inventory turnover uses cost of goods sold divided by average inventory over a longer accounting period. Both measure how efficiently stock moves, but sell-through is more practical for merchandise planning at the SKU level, while turnover summarizes overall working capital efficiency on the financial statements.

Frequently asked questions