Definition
Keyword cannibalization happens when multiple keywords or campaigns compete for the same queries, increasing cost or distorting reporting.
Example
A brand campaign and a generic campaign both match the same query and split impressions.
How to use it
- Separate brand and non-brand with clear negatives and routing rules.
- Consolidate overlapping ad groups when you cannot tell what is working.
- Use search term reports to find overlapping queries regularly.
Common mistakes
- Letting automated bidding create overlap without negative rules.
- Optimizing bids without consolidating duplicate keywords.
Why this matters
This term matters because it affects how you interpret performance and make budget decisions. If you use inconsistent definitions or windows, ROAS/CPA can look "better" while profit gets worse.
Practical checklist
- Write a 1-line definition for "Keyword Cannibalization" that your team will use consistently.
- Keep the time window consistent (weekly/monthly/quarterly) when comparing trends.
- Segment results (channel/plan/cohort) before drawing big conclusions from blended averages.
- Sanity-check with a related calculator from the same category on MetricKit.
- Read the related guide (e.g., Paid ads bidding & budgeting hub: max CPC, target CPA, and break-even targets) for context and common pitfalls.
Where to use this on MetricKit
Calculators
- Break-even CVR Calculator: Compute the CVR required to break even (and hit a target) given CPM, CTR, AOV, and contribution margin.
- Click-through Conversion Rate Calculator: Calculate click-through conversion rate (click-to-conversion CVR) and estimate required clicks for target conversions.
- ROAS Calculator: Calculate Return on Ad Spend (ROAS) and estimate contribution profit after ad spend.
- Break-even ROAS Calculator: Estimate the break-even ROAS based on contribution margin assumptions.
- Target ROAS Calculator: Estimate a target ROAS to cover variable costs plus a desired margin buffer.
Guides
- Paid ads bidding & budgeting hub: max CPC, target CPA, and break-even targets: A practical hub for bidding and budgeting: compute max CPC from CVR and margin, set target CPA using LTV, and use break-even CTR/CVR/CPM targets to guide creative and landing optimizations.