Many Thai businesses run Google Ads for months wondering why their cost per lead is so high. Some are paying 3x more per lead than competitors selling the exact same thing.
The problem is rarely budget. It's almost always account structure and Quality Score — two things that directly determine how much Google charges you per click.
This post explains how Quality Score works, the four most common reasons CPL climbs too high, and what to fix first.
What Quality Score Is and Why It Sets the Price You Pay
Quality Score is a 1-10 rating Google assigns to each keyword in your account. It's calculated from three components: Expected CTR, Ad Relevance, and Landing Page Experience.
What most advertisers miss: Quality Score directly affects your actual CPC. Google's formula is Actual CPC = (competitor's Ad Rank below you / your Quality Score) + 0.01.
In plain terms: if your Quality Score is 4 and a competitor's is 8, you pay more to show in the same position. An account where most keywords sit below 6 will almost certainly pay 2-3x the market rate per lead.
Four Reasons Your Google Ads CPL Is Too High
1. Broad Match Keywords With No Negative Keywords
Running broad match keywords without a negative keyword list is the single most common structural mistake. Google will serve your ads against a wide range of queries — including ones completely unrelated to your business.
Example: bidding on "accounting software" in broad match might show your ad to someone searching "free accounting course" or "part-time accounting jobs." Clicks come in, leads don't.
Fix: review your Search Terms Report weekly. Add 20-30 negative keywords in the first week. For your core commercial keywords, switch to Phrase Match or Exact Match.
2. Landing Page Doesn't Match What the Keyword Promises
If someone searches "accounting software pricing" and your ad sends them to a generic homepage with no pricing, Google's Landing Page Experience score drops — and so does your Quality Score.
Google measures landing page relevance by content match, load speed, and engagement signals like bounce rate and time on page.
Fix: build dedicated landing pages for each major campaign or ad group. The page must answer what the keyword asked — visible above the fold, with a clear CTA.
3. Ad Copy Doesn't Match Search Intent
Ad Relevance is the Quality Score component that measures how closely your ad matches what someone is searching for. Using one generic ad across all keywords in an ad group tanks this score.
Fix: tighten your ad groups so each group contains only closely related keywords. Write ad copy that references those keywords directly. Use Responsive Search Ads with at least 2-3 headlines that contain your target keyword.
4. Wrong Bidding Strategy for the Data You Have
Target CPA and Maximize Conversions work well only when you have enough conversion history. Google recommends at least 30-50 conversions per month per campaign before switching to Smart Bidding.
Starting a new campaign on Target CPA from day one leaves the algorithm without enough signal — resulting in low impression share, few clicks, and high CPL.
Fix: start with Maximize Clicks or Manual CPC to build conversion data over 4-6 weeks, then migrate to Target CPA once you've passed the 30-conversion threshold.
How to Audit Quality Score Across Your Whole Account in 10 Minutes
Go to Keywords → Columns → Modify Columns → add Quality Score, Expected CTR, Ad Relevance, and Landing Page Experience. Download as CSV and filter for anything below 6. Those are your priorities.
If you want our team to audit and restructure your Google Ads account, see our Google Ads service.