Calculate Sell Through Rate in Seconds — Free Tool
Calculate your sell through rate and uncover hidden cash tied up in unsold stock. Make smarter buying decisions and protect your margins — free, fast, and accurate.
Frequently Asked Questions
Use our free Sell Through Rate Calculator to measure inventory performance instantly. Input units received and sold — get your STR, days of stock, and sales velocity fast.
A: Sell through rate (STR) is the percentage of inventory sold within a given period, calculated as: (Units Sold ÷ Units Received) × 100. It tells you exactly how fast your stock moves. A low STR means cash is sitting idle on your shelves. A high STR signals strong demand and healthy inventory turnover — both critical to protecting your margins.
A: The sell through rate formula is straightforward:
STR (%) = (Units Sold ÷ Units Received) × 100
Example: You received 100 units and sold 65 in 30 days. Your sell through rate = 65%. Use this calculator to get that number — plus remaining stock, sales per day, and days of inventory — in one click.
A: Most retail benchmarks target an STR between 70%–85% per period. Below 50% typically signals overstocking or weak demand. Above 90% can mean you're leaving sales on the table due to stockouts. The right target depends on your product category, seasonality, and reorder lead time.
A: This calculator shows your days of inventory automatically. The formula is:
Days of Inventory = Remaining Stock ÷ Sales Per Day
In the example above: 35 remaining units ÷ 2.2 units/day = ~16 days of stock left. That's your reorder window — use it to plan purchases before you hit zero.
A: Every unsold unit is frozen cash. If your STR is low, you're funding inventory that isn't generating revenue. Tracking your sell through rate weekly or monthly lets you spot slow-moving SKUs early, discount strategically, and free up working capital — which is the core principle behind lean inventory and FIRE-aligned business management.
A: The period (days) field adjusts your sales velocity (units per day) and days of inventory remaining — but it does not change the STR percentage itself. STR is purely units sold vs. units received. Changing the period helps you benchmark performance across different timeframes: weekly sprints vs. monthly cycles vs. quarterly reviews.
A: When you enter a cost per unit, the calculator multiplies it by remaining stock to show your unsold stock value — the exact dollar amount tied up in inventory. This figure is critical for cash flow planning, write-off decisions, and end-of-season clearance pricing. If that number is growing period over period, your buying strategy needs adjustment.
A: Yes. The sell through rate calculator works for any product-based business: brick-and-mortar retail, Amazon FBA, Shopify stores, wholesale, and subscription boxes. Amazon itself uses STR to evaluate FBA storage efficiency — sellers with low sell-through rates may face higher storage fees or restock limits. Knowing your STR before Amazon flags it gives you a critical operational edge.