Question
Why use gross profit instead of revenue per unit?
Gross profit is usually a better signal for stockout impact because it reflects the contribution dollars actually lost, not just the top-line sale value.
Ecommerce
Use OmniCalc's stockout cost calculator to estimate the gross-profit loss and recovery spend caused by running out of stock.
Stockout cost calculator
Use missed unit demand, gross profit per unit, stockout duration, and recovery spend to estimate the true cost of running out of stock.
Why this result matters
An ecommerce inventory-risk calculator that estimates total stockout cost from missed unit demand, unit gross profit, stockout duration, and recovery spend. Use the tool above to enter a few clear inputs and get a practical answer you can use right away.
This stockout cost calculator helps ecommerce operators estimate what stockouts are actually costing the business. It is useful because running out of stock usually creates more than delayed revenue — it can also destroy gross profit, trigger emergency recovery spending, and increase the daily cost of inventory mistakes.
Formula and method
The calculator estimates lost gross profit by multiplying missed units by gross profit per unit, then adds recovery spend such as rush freight or make-good offers. It also spreads that total across stockout days and missed units to show the ongoing cost of leaving the stockout unresolved.
Example
If 180 units were out of stock, gross profit per unit was $14, the stockout lasted 9 days, and recovery actions cost $650, the calculator estimates the total stockout cost and the cost per day of the outage.
FAQ
Short answers to the questions people often ask before or after using the tool.
Question
Gross profit is usually a better signal for stockout impact because it reflects the contribution dollars actually lost, not just the top-line sale value.
Question
Recovery cost can include rush inbound freight, emergency purchasing premiums, make-good discounts, or other spending used to reduce the damage from the stockout.
Question
No. This tool is a practical short-term economic estimate, so the true business cost of a stockout may still be higher than the result shown.
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