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Cannibalization Rate Calculator

Enter the existing-product sales lost and the new product's sales to find the cannibalization rate.

How it is calculated

The tool computes rate = lost sales / new product sales × 100 and incremental = new product sales − lost sales. Lost sales are the units (or any sales measure) the existing products lost because buyers switched to the new one; new sales are everything the new product sold. Both must be in the same measure and period, such as units in the first quarter after launch. Lost sales cannot be negative and new sales must be above zero. The incremental figure is the sales that are truly additional. A rate above 100% is possible and means the launch removed more existing sales than it created, so total sales fell.

Worked example

A new model sold 4,000 units in its first quarter, while the older model sold 1,200 fewer units than it would have without the launch. The rate is 1,200 / 4,000 = 0.30, which is 30.00%. The incremental sales are 4,000 − 1,200 = 2,800 units. In other words, 30% of the new product's volume came out of the existing lineup, and 70% (2,800 units) was added on top of what the company would otherwise have sold.

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Common mistakes

  • Measuring lost sales as the whole decline of the old product. Part of that drop may come from seasonality, price changes or competitors, so only the portion caused by customers switching counts.
  • Dividing lost sales by the old product's previous sales. This tool divides by the new product's sales, so the result answers a different question from "how much of the old product did we lose".
  • Mixing measures, for example lost revenue against units sold. Use units against units or revenue against revenue.
  • Reading a high rate as a failure. If the new product has a higher margin, a 30% or 40% rate can still raise profit; the tool measures sales only, not margin.
  • Comparing different time windows. Count both figures over the same period, otherwise the rate is inflated or understated.

About this calculator

When a company launches a new product, not all of its sales represent genuinely new demand — some customers simply switch over from an existing product in the lineup, a substitution effect known as cannibalization. The cannibalization rate quantifies it as existing-product sales lost ÷ new product’s total sales, expressed as a percentage.

A high cannibalization rate means the new launch is mostly rearranging sales the company already had rather than growing the pie, which changes how its success should be judged and whether it’s worth the investment; some cannibalization is often an acceptable trade-off if the new product carries a better margin or defends against a competitor. Product managers, brand managers and marketing analysts calculate this rate after a line extension or new SKU launch to measure true incremental revenue rather than gross new-product sales alone.

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