Sell-Through Rate Calculator
Calculate sell-through rate, unsold units, and daily velocity for inventory over any time period — the health check for stocking decisions.
- Free calculator
- Instant estimate
- No signup needed
- Beginner friendly
Sell-through rate
37.5%
Unsold inventory
75
Sales velocity / day
1.50
Projected monthly sales
45
At current pace
Higher sell-through generally signals healthier inventory. Consistently low rates mean over-buying, pricing issues, or slow SKUs.
All calculations are estimates based on average platform fees. Real profits may vary depending on category, ads, and shipping.
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How to use this calculator
- Enter your numbers in each field above — the calculator updates instantly as you type, so there's nothing to submit.
- Use your real figures when you have them, or sensible estimates while you're planning. If a field doesn't apply, leave it at zero.
- Compare the results, then change one input at a time to see how each lever (price, cost, fees, volume) moves the outcome.
Formula
Sell-through % = Sold ÷ Listed × 100 · Unsold = Listed − Sold · Velocity/day = Sold ÷ Days · Projected monthly = Velocity × 30
Worked example
120 listed, 45 sold in 30 days.
- Rate = 45 ÷ 120 = 37.5%
- Unsold = 75
- Velocity = 1.5/day
- Projected monthly = 45
Answer: 37.5% sell-through in 30 days
How it works
Sell-through is the cleanest inventory-health signal. Consistently below 20–30% in a month usually means over-ordering or a pricing problem — not a marketing problem.
How to interpret your results
- Dollar values are shown per sale, per order, or per item unless a result is explicitly labelled monthly, weekly, or daily.
- Percentages (margin, ROI, conversion rate) are easier to compare across products and price points than raw dollars — use them when you benchmark.
- A positive result means you're ahead after the costs and fees you entered. A negative result means the current numbers don't work — change a lever (raise price, cut a cost, lower ad spend) and recalculate.
- Treat the output as a planning estimate, not a guarantee. Fees, taxes, and conversion rates shift over time — re-run the numbers whenever a key input changes.
Common mistakes
- Averaging across SKUs and hiding a dead product.
- Measuring sell-through over too short a window.
- Ignoring seasonality — Q4 rates aren't Q1 rates.
Related Guides
Go deeper with plain-English guides on the same topic.
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FAQ
- What's a healthy sell-through rate?
- 40–60% per month is strong for most physical goods. Under 20% signals overstock or a slow SKU.
- How is this different from inventory reorder point?
- Sell-through measures how well existing inventory is moving. Reorder point tells you when to restock.
Why trust this calculator?
This tool uses standard mathematical formulas and commonly accepted calculation methods, shown openly in the Formula section above so you can verify the math yourself. Results are estimates based on the information you enter and do not account for every individual circumstance. For important financial, tax, legal, medical, or business decisions, please double-check with a qualified professional before acting on the numbers.
Keep going
One calculator rarely tells the full story. Pair this one with a related tool below to pressure-test your numbers from a different angle, or browse Selling & Business Calculators for more in the same category.
What to calculate next
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