Business
Inventory Break-Even Calculator
Calculate unit contribution, break-even and target-profit units, expected revenue and operating profit, volume margin, inventory-turn reference, and break-even revenue.
Contribution per sold unit-
Units required to cover fixed cost-
Units required for entered target profit-
Revenue at expected volume-
Operating profit at expected volume-
Expected units minus break-even-
Expected sales divided by average inventory-
Revenue at break-even units-
Decision view
Inventory profit-volume break-even chart
Inventory profit-volume break-even chartLoss, zero-profit crossing, expected volume, and target-profit volume are shown on one decision plane.
Exact scenario comparisonHandling cost per unit changes while all other entered assumptions remain constant.
| Handling cost per unit | Contribution per sold unit | Units required to cover fixed cost | Units required for entered target profit | Revenue at expected volume | Operating profit at expected volume | Expected units minus break-even | Expected sales divided by average inventory | Revenue at break-even units |
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How to use Inventory Break-Even Calculator
- Enter monthly fixed storage and systems cost.
- Enter selling price and every named per-unit cost.
- Enter expected volume, target profit, and average inventory.
- Use the break-even chart to compare zero profit, expected volume, and target-profit volume.
Calculator guide
Understanding Inventory Break-Even Calculator
Inventory break-even depends on contribution per sold unit, not selling price alone. This calculator subtracts product, handling, and shrink allowances before determining the exact whole-unit volume that covers fixed storage and systems cost.
Calculation method
How the calculation works
Subtract all named per-unit costs from selling price and divide fixed inventory infrastructure cost by the resulting contribution, then extend to target-profit volume. Subtract all named variable costs from selling price, divide fixed cost by unit contribution, round required units upward, and evaluate profit across a volume range.
Detailed calculation process
Move from unit economics to a whole-unit break-even decision
The defaults sell at $85 per unit with $42 product cost, $6 handling, $3 shrink allowance, $18,000 monthly fixed cost, and 900 expected units.
General formula: c = P-C_p-C_h-C_s; Q_BE = ceil(F/c); Q_T = ceil[(F+T)/c]; pi(Q)=cQ-F; R_BE=PQ_BE; Turn=Q/I_avg Only the contribution left after every per-unit cost can cover fixed cost and profit. Because units are indivisible, break-even and target volumes round upward; the profit line crosses zero at the unrounded F/c threshold.
What each symbol means
Worked substitution with the default inputs
The default contribution is $34/unit, whole-unit break-even is 530 units, expected profit at 900 units is $12,600, and 971 units are needed for the $15,000 target.
Decision chart
See loss, break-even, expected profit, and target volume
The profit-volume line crosses a zero-profit axis and labels the three decision volumes.
Worked situations
Practical examples
- The default unit contribution is $34.
- The unrounded break-even is 529.411765 units, so 530 whole units are required.
- Expected monthly volume produces $12,600 operating profit.
Better inputs
Useful tips
- Use contribution costs that vary with each sold unit.
- Keep step-fixed capacity costs separate from this single fixed-cost level.
- Test markdowns, returns, and stockouts as additional scenarios.
Before relying on the result
Limitations and common mistakes
- The model assumes constant price, unit costs, and fixed cost across the plotted volume range.
- Multiple SKUs, mix shifts, returns, taxes, financing, vendor terms, capacity steps, and working-capital timing are excluded.
- The inventory-turn result is a monthly planning reference, not a standards-based annual ratio.
Reference
Key terms
- Unit contribution
- Selling price minus all modeled variable costs per unit.
- Break-even volume
- Smallest whole-unit sales quantity that covers modeled fixed cost.
- Target-profit volume
- Whole-unit sales quantity that covers fixed cost plus entered profit.
Important note
Calculated from the entered values using the displayed accounting method. Reconcile material decisions with source records and applicable accounting policy.
Frequently asked questions
Why is break-even rounded up?
A fractional unit cannot be sold in this model, and rounding down would leave fixed cost uncovered.
Should rent be a unit cost?
Usually no. A recurring storage or systems charge belongs in fixed cost unless it varies directly per unit.
Why can expected profit be below the target?
Expected 900 units are above break-even but below the 971 units required for the entered target.
Is inventory turn annualized?
No. It is monthly expected units divided by average units held.