PPC research: keywords, competitors and the break-even CPC

PPC research is the work of checking search demand, customer intent, competitors’ visible ads, landing pages and conversion economics before you launch or change a pay-per-click campaign. PPC means pay per click: you pay when someone clicks your ad.

I count the research as done when it can name the most a click may cost. Every number here is a worked example you can rerun with your own figures.

What should PPC research answer?

PPC research should answer six questions before any money is spent: who to reach, where to reach them, what competitors show, what a click can cost, whether the page keeps the ad’s promise and which result ends the test.

Search volume, estimated cost per click (CPC) and competitor activity are clues to these questions. None of them shows that a campaign will be profitable.

How do you research PPC keywords?

You research PPC keywords by starting from the words customers already use, grouping them by intent, then checking demand in Google Ads Keyword Planner and, once ads run, in the search terms report.

Step 1. Set the business goal and the scope

Choose one primary outcome, such as purchases, qualified leads or booked consultations. Then fix the market, language, period, audience and offer, and record the limits: stock, margin, sales capacity, seasonality and budget.

“Get more traffic” gives the team nothing to judge. A testable brief reads like this: test whether searches for insulated lunch bags bring first-time purchases in the US at an acquisition cost below the product’s contribution before advertising.

Step 2. Group customer language by intent

Start with the words customers use in sales calls, support requests, reviews, site search and existing campaign reports. Group them by the job behind the search instead of treating every phrase as an equal keyword.

For example, the lunch bag searches split into four jobs, and each needs a different ad and page.

Check demand in Keyword Planner and the search terms report

For Google Search campaigns, Google Ads Keyword Planner suggests terms and gives historical estimates and forecasts.

Use them as planning data, and check location, language, seasonality, match type and the real search results before you build a campaign.

Once campaigns run, the search terms report shows which queries triggered your Search, Shopping or Performance Max ads and how they performed, minus low-volume queries hidden for privacy. Exclude irrelevant intent as negatives, and give promising intent its own test.

A keyword and a search term are different things, and the report only makes sense once you keep them apart.

How do you research PPC competitors and landing pages?

You research PPC competitors through what a customer can see: their ads, prices, offers, proof and landing pages. Their bids, budgets, targeting and profit stay unknown, whatever a tool suggests.

Step 3. Separate business and search competitors

Business competitors sell similar products; search competitors are whoever advertises on the same query. The two lists often differ.

For each one, note the promise, price, offer and proof, and mark which observations are facts and which are guesses. A visible ad isn’t proof of profit, and copied wording won’t necessarily suit your audience.

Price is the part you can measure product by product. Competitor Prices in Product Metrics compares your products with competitors’ alternatives by style, colour and dimensions you define, without shipping costs.

What each PPC research tool can and can’t tell you

The Google Ads Transparency Center shows ads from verified advertisers, and the Meta Ad Library is a searchable view of ads across Meta. Both show messaging and formats, not bids, budget, click-through rate or return.

For ads shown in the EU, both also list targeting information and how many people saw each ad (Google Ads Help).

In Search, Shopping and Performance Max campaigns, Auction insights compares your visibility with other advertisers in the same auctions (Google Ads Help). Our Auction insights guide shows how to read overlap and outranking share.

Keep the source and date with every note. Platforms estimate with different models, so their numbers aren’t directly comparable.

Step 4. Check the landing page and the offer

A click only pays off when the page meets the visitor’s expectation. Check each promising search theme against this list.

Turn what you find into changes to test: a lower price, stronger proof or a clearer delivery promise can matter more than another headline or Shopping product title tweak.

How much can you afford to pay per click?

You can afford to pay up to your break-even CPC: contribution before advertising per order × expected conversion rate. An order that contributes €20 at a 3% conversion rate gives a break-even CPC of €0.60 (€20 × 0.03).

Step 5. Work out the break-even CPC

Contribution before advertising is what an order leaves after product cost, shipping, payment fees and returns, before any ad spend. Revenue alone hides this: two products can sell for the same price and have very different profit margins.

Show the dataHide the data

Break-even CPC by conversion rate, €20 contribution per order

Conversion rate	Break-even CPC
1%	€0.20
2%	€0.40
3%	€0.60
4%	€0.80
5%	€1.00

The same formula gives the ceiling for any product. Find your row and your expected conversion rate.

Compare that ceiling with your actual CPCs and Keyword Planner’s top-of-page bid range: roughly the 20th to 80th percentile of what advertisers paid in the last 30 days (Google Ads Help). Break-even is the limit, not the target, because the campaign also needs room for uncertainty and overheads.

The Google Ads budget calculator works out that ceiling from order value, margin and conversion rate, and shows how many clicks a daily budget buys per product.

Why can two products with the same ROAS earn different profits?

Two products with the same ROAS earn different profits because ROAS divides revenue by ad spend and ignores what each sale leaves after costs.

For example, products A and B each bring €100 of tracked revenue on €15 of ad spend. Product A contributes €30 before advertising, product B €12.

Show the dataHide the data

Same ROAS, different break-even

Product	ROAS	Break-even ROAS
Product A (30% margin)	6.67	3.33
Product B (12% margin)	6.67	8.33

Break-even ROAS is 1 ÷ contribution margin, so product A breaks even at 3.33 and product B at 8.33.

POAS is ROAS × contribution margin, and break-even POAS is 1.0. POAS vs ROAS explains when each one fits, and the break-even ROAS calculator works out the floor per product.

Working this out by hand for hundreds of products doesn’t scale. Product Segmentation checks every product in Google Shopping and Performance Max at once.

It segments each product on ROAS, or on POAS once margins are connected, and writes the segment to a Merchant Center label your campaigns use.

How do you turn PPC research into a test?

Turn PPC research into a test by ranking the opportunities, writing a hypothesis with its cost threshold before you spend, and judging the result against that threshold.

Step 6. Prioritise a small test

Rank opportunities on five criteria, and don’t pick a phrase only because its estimated search volume is large. A smaller, high-intent audience is often the better first test when the offer and page match.

Write the hypothesis down first: “We expect this query group to produce [conversion] at or below [cost threshold] because [evidence]. We will review [metrics] after [time or volume threshold].”

Keep the test narrow. If you change audiences, ads, landing pages and budgets at once, you can’t tell which change caused the result.

Step 7. Review outcomes and update the research

Once data arrives, compare the real search terms, placements, costs and conversions with your assumptions. Impressions, clicks, click-through rate and CPC diagnose the campaign; orders, qualified leads and contribution after ad spend decide it.

Check that conversion tracking works before you draw conclusions. Use a fixed review period, and allow for conversion delay, low volume and seasonality.

Feed what you learn into the next round of research.

Final thoughts

Keywords and competitors tell you where to look. The break-even CPC tells you whether looking there can pay off in product profit.

Pick one product, work out its break-even CPC, and compare it with Keyword Planner’s top-of-page bid range before you write the first ad.