Rex says
Money math without the spreadsheet headache. Plug in your numbers and I'll show you exactly where the dollars land.
Try a scenario
Click to load — tweak from there.Inputs
Result
Sell-through rate
64.0%
Units remaining
180
Read
Healthy range
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How to use this
- 1Enter units sold in period.
- 2Enter units available (beginning + received).
- 3Read your sell-through rate on the right — it updates as you type.
- 4Hit Share to keep the scenario or send it to someone.
About this calculator
Sell-through rate measures how much of the inventory you received actually sold within a given period, and it's the clearest early signal of whether a SKU is a winner worth reordering or a slow mover headed for a markdown. A healthy sell-through rate for most retail categories runs 40-80% per month depending on category and how frequently you restock; consistently low sell-through means overbuying or weak demand, while very high sell-through (over 90%) may mean you're leaving sales on the table by understocking. This calculator takes units sold in a period and units received (beginning inventory plus any restocks) to compute the sell-through percentage. Enter units sold during the period and total units available (on-hand at period start plus anything received during the period), and you'll get sell-through rate plus a rough read on whether that rate suggests reordering, holding steady, or marking down. Track this by SKU monthly to catch slow movers before they turn into aged inventory taking up warehouse space and tying up cash.
Worked example
Using the values the calculator loads with:
Inputs
- Units sold in period: 320
- Units available (beginning + received): 500
Results
- Sell-through rate: 64.0%
- Units remaining: 180
- Read: Healthy range
What each field means
Inputs
- Units sold in period
- The units sold in period used in the calculation. Starts at 320 so you have a working example on load.
- Units available (beginning + received)
- The units available (beginning + received) used in the calculation. Starts at 500 so you have a working example on load.
Results
- Sell-through rate
- Returned as a percentage and shown as the headline result. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Units remaining
- Returned as a whole number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Read
- Returned as a plain value. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
FAQ
What's a good sell-through rate?
Most retail categories target 40-80% sell-through per month as healthy. Fast fashion and trend-driven categories often aim higher (60-80%) given short shelf life, while durable goods or evergreen basics can run lower (30-50%) and still be considered fine since they don't go stale.
What does a very high sell-through rate mean?
Above roughly 90% often signals you're leaving money on the table — demand outpaced supply and you likely lost sales to stockouts. Pair sell-through rate with stockout tracking to distinguish 'great product-market fit' from 'we should have ordered more.'
How often should I check sell-through rate?
Weekly for fast-moving or seasonal SKUs, monthly for stable evergreen products. Checking too infrequently means you catch a slow mover only after several reorder cycles have already piled up excess stock.
How is this different from inventory turnover?
Sell-through rate looks at a single period's received inventory against what sold; inventory turnover measures how many times you cycle through your average inventory value over a year. They're related but turnover is a broader annualized efficiency metric while sell-through is a tactical per-SKU, per-period check.
Accuracy and limitations
- Results are estimates before tax, fees, and inflation unless an input explicitly covers them.
- Rates are treated as fixed for the whole period — variable-rate products will drift from this projection.
- This is educational maths, not financial advice. Check anything contractual with the lender or your accountant.
Related tools
GMROI Calculator
How many gross margin dollars you generate per dollar tied up in inventory.
Inventory Reorder Point Calculator
The inventory level that triggers a new purchase order before you stock out.
Markdown & Discount Margin Impact Calculator
How much extra volume a discount needs to generate to break even on margin dollars.
Cite this calculator
Writing about this topic? Grab a citation — every link helps keep these tools free.
RevenueLab. (2026). Sell-Through Rate Calculator. Retrieved from https://www.revenuelab.fyi/toolbox/sell-through-rate
<p>Source: <a href="https://www.revenuelab.fyi/toolbox/sell-through-rate" target="_blank" rel="noopener">Sell-Through Rate Calculator — RevenueLab</a> (2026).</p>
Source: [Sell-Through Rate Calculator — RevenueLab](https://www.revenuelab.fyi/toolbox/sell-through-rate) (2026).