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FREE INVENTORY CALCULATOR

Sell-Through Rate Calculator

Calculate inventory sell-through rate, measure remaining inventory, and compare current performance with a target sell-through level.

  • Free to use
  • No sign-up required
  • Built for real inventory decisions

Calculator

Inventory Input Method
units
On-hand inventory at the beginning of the analysis period.
units
Additional units received during the analysis period.
units
Number of units sold during the analysis period.
days
Length of the period represented by the sell-through calculation.
%
Optional target used to estimate the additional units needed to sell.
$per unit
Used to estimate the inventory value represented by unsold units.

Results

Calculated
Sell-Through Rate60.0%

You sold 60.0% of the inventory available during the entered 30-day analysis period.

Units Available1,000 unitsBeginning inventory + receipts
Units Sold600 unitsDuring the entered 30-day period
Ending Inventory400 unitsUnits available − units sold
Unsold Rate40.0%Share of units still remaining
Remaining Inventory Value$10,000Ending inventory × unit cost

Decision metrics

Target Sell-Through80.0%Your entered target
Sell-Through Gap20 percentage pointsTarget rate − current rate
Target Units Sold800 unitsAvailable units × target rate, rounded up
Additional Units to Sell200 unitsUnits needed to reach the target
Target-Implied Ending Inventory200 unitsAvailable units − target units sold
Inventory Value Above Target-Implied Remainder$5,000Target comparison, not guaranteed savings
Decision Insight

Your sell-through rate is 60.0% for the entered 30-day period. Reaching an 80.0% target would require approximately 200 units, reducing ending inventory from 400 units to about 200 units. Those 200 units represent approximately $5,000 of inventory value at the entered unit cost. This is a target comparison, not a guaranteed sales forecast or cash-saving estimate.

Inventory Sell-Through Mix

Share of units sold and remaining during the entered analysis period.

Sold 60%Remaining 40%

Target Comparison

Compare current sell-through and ending inventory with the entered target.

Sell-Through Rate
Current 60%
Target 80%
Ending Inventory
Current 400 units
Target-Implied 200 units

Key Takeaways

  • Sell-through rate measures the share of available inventory sold during a defined period.
  • Always compare sell-through using consistent periods and inventory definitions.
  • Low sell-through can indicate excess stock, weak demand, poor assortment fit, or simply a short or seasonal analysis period.
  • A higher sell-through rate is not automatically better if inventory levels become too low to meet customer demand.

How It Works

Sell-through compares units sold with the total units available for sale during the same period.

Units Available equals Beginning Inventory plus Receipts During Period, or can be entered directly.

Divide sold units by available units, then compare the result with an optional target.

Different businesses can use different definitions; this tool explicitly uses Units Sold ÷ Units Available to Sell.

Formula

Formula 1

Units Available to SellBeginning Inventory + Units Received During Period

Formula 2

Sell-Through RateUnits Sold ÷ Units Available × 100

Formula 3

Ending InventoryUnits Available − Units Sold

Formula 4

Unsold Rate100% − Sell-Through Rate

Formula 5

Target Units Soldceil(Units Available × Target Sell-Through Rate)

Formula 6

Additional Units to Sellmax(Target Units Sold − Current Units Sold, 0)

Formula 7

Remaining Inventory ValueEnding Inventory × Unit Cost

Formula 8

Inventory Value Above Target-Implied RemainderAdditional Units to Sell × Unit Cost

Where:

  • Units Available: beginning inventory plus receipts, or the directly entered available units.
  • Target Sell-Through: an optional percentage used for a target comparison.
  • Unit Cost: an optional cost per unit used for inventory-value estimates.

Example Calculation

Let’s say:

  • Beginning Inventory: 600 units
  • Receipts: 400 units
  • Units Sold: 600 units
  • Analysis Period: 30 days
  • Target Sell-Through: 80%
  • Unit Cost: $25
Step 1: Units Available = 600 + 400 = 1,000 units. Step 2: Sell-Through = 600 ÷ 1,000 × 100 = 60%. Step 3: Ending Inventory = 1,000 − 600 = 400 units. Step 4: Target Units Sold = 1,000 × 80% = 800 units. Step 5: Additional Units to Sell = 800 − 600 = 200 units. Step 6: Target-Implied Ending Inventory = 1,000 − 800 = 200 units. Step 7: Remaining Inventory Value = 400 × $25 = $10,000. Step 8: Inventory Value Above Target-Implied Remainder = 200 × $25 = $5,000.

Current sell-through is 60%. An 80% target would imply 200 additional unit sales and approximately 200 units of ending inventory.

How to Use the Result

  • Compare sell-through across similar products and consistent analysis periods.
  • Use low sell-through as a signal to investigate demand, pricing, promotion, assortment fit, and inventory levels.
  • Do not reduce inventory solely to improve sell-through without checking stockout risk and replenishment lead time.
  • Compare remaining inventory with Days of Supply, Inventory Aging, and Dead Stock results.
  • Recalculate after major receipts, promotions, seasonal changes, or assortment updates.

Limitations

  • Sell-through definitions can vary between businesses; this calculator uses units sold divided by units available to sell during the period.
  • Sell-through is highly dependent on the selected analysis period.
  • Seasonality, promotions, stockouts, and product launches can strongly affect sell-through.
  • A high sell-through rate does not automatically mean inventory is optimized if products frequently stock out.
  • A low sell-through rate does not automatically mean inventory is excess or obsolete.
  • Target sell-through rates vary significantly by product category, lifecycle stage, business model, and period length.
  • Inventory Value Above Target-Implied Remainder is a target comparison, not guaranteed savings or recoverable cash.
  • The calculator does not automatically forecast future demand or future receipts.

Frequently Asked Questions

What is sell-through rate?

It is the percentage of available inventory sold during a defined period.

How do you calculate sell-through rate?

Divide units sold by units available to sell, then multiply by 100.

What is a good sell-through rate?

It varies by product, lifecycle, business model, and period, so compare similar products over consistent periods.

What is the difference between sell-through rate and inventory turnover?

Sell-through measures the share of available units sold in a period. Turnover measures how efficiently average inventory moves using COGS.

Should sell-through be calculated weekly or monthly?

Use the period that matches the planning decision, but compare results using consistent periods.

What does a 60% sell-through rate mean?

It means 60% of units available during the entered period were sold, leaving 40% unsold.

Can sell-through rate be over 100%?

Not under this tool’s definition, because units sold cannot exceed units available to sell.

How can I improve sell-through rate?

Investigate demand, pricing, promotion, assortment fit, product availability, and inventory levels.

Does low sell-through mean I have excess inventory?

Not always. It can also reflect seasonality, a short period, product launches, or stock availability changes.

What is the difference between sell-through and sales velocity?

Sell-through is the proportion of available units sold. Sales velocity measures how quickly products sell over time.

How do receipts affect sell-through rate?

Receipts increase units available, which can lower the rate unless unit sales rise proportionally.

Should ending inventory be used in the sell-through formula?

This calculator uses units sold divided by units available, then derives ending inventory as available minus sold.

Can high sell-through cause stockouts?

Yes. A high rate can coincide with insufficient remaining inventory if replenishment is slow or demand remains high.

How often should sell-through be reviewed?

Review after meaningful receipts, promotions, seasonal changes, or assortment decisions.