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Brand Keyword Bidding Efficiency Calculator

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Understanding the brand keyword bidding efficiency calculator — concept and principle

Brand keyword campaigns, where you bid on your own company name in search ads, usually show a very low cost per acquisition. The catch is that many of those buyers were already looking for you and would have clicked your free organic listing anyway. This calculator separates reported results from truly incremental ones, so you can decide whether brand bidding pays for itself.

Incremental value of brand keyword adsOf 200 conversions from $1,000 of brand ads, only 40 (20%) are incremental. Reported CPA is $5 but the true incremental CPA is $25; 40 × $80 × 40% = $1,280 profit gives an ROI of 28%.Would they have bought anyway?Brand-name ads: $1,000200 conversions · each dot = 10160 would come anyway40 only via ads (20%)Reported CPA$1,000 ÷ 200= $5True incremental CPA$1,000 ÷ 40= $2540 × $80 order × 40% margin = $1,280 profit$Incremental ROI +28%($1,280 − $1,000) ÷ $1,000
Counting only the 40 extra sales turns a $5 CPA into $25; their profit still beats the spend by 28%.

How it is calculated

The incremental share is your estimate of the percentage of brand-ad conversions you would lose without the ads, for example to competitors bidding on your name. The calculator works with any currency.

The principle

Advertising earns its keep only through the sales it causes. If 80% of brand-ad buyers would have bought through organic search, the ads only "bought" the remaining 20%, and the whole spend should be divided by that smaller number. ROI is measured on gross profit, not revenue, because the goods cost money to supply. A well-known field experiment at eBay found that pausing brand search ads shifted most of that traffic to organic links, which is why incrementality matters more than the reported CPA.

Worked example

  1. Inputs: spend $1,000, 200 conversions, incremental share 20%, average order $80, gross margin 40%.
  2. Incremental conversions = 200 × 0.20 = 40.
  3. Incremental gross profit = 40 × $80 × 0.40 = $1,280.
  4. Incremental ROI = ($1,280 − $1,000) ÷ $1,000 × 100 = 28%.
  5. Reported CPA = $1,000 ÷ 200 = $5.00.
  6. True incremental CPA = $1,000 ÷ 40 = $25.00.

How to read the result

A positive incremental ROI means the campaign earns more gross profit than it costs, even after removing sales you would have made anyway. The break-even incremental CPA is average order × gross margin, here $80 × 0.40 = $32; a true CPA below that is profitable. If ROI is negative, try lowering bids, limiting brand ads to times or regions where competitors bid, or pausing them in a controlled test.

Common mistakes

Keep in mind: The result is only as good as the incremental share you enter. It counts one order per conversion and excludes lifetime value and brand protection effects. This is not financial or advertising advice.

Frequently asked questions

How do I measure the incremental share?

Pause brand ads in some regions or time periods and compare total brand conversions, paid plus organic, with a matched control. The drop is the incremental part.

Should I always stop bidding on my brand name?

Not necessarily. When competitors bid on your name or your organic listing is weak, a larger share of conversions is at risk and brand ads can be profitable.

Sources: Thomas Blake, Chris Nosko and Steven Tadelis, "Consumer Heterogeneity and Paid Search Effectiveness: A Large-Scale Field Experiment", Econometrica 83(1), 2015

Checked 8 Nov 2026. Standard business and finance formulas. Estimates for information only.

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