Google Ads Metrics Explained (with a Free ROAS & CPA Calculator)
CTR, CPC, conversion rate, CPA, ROAS and CPM — what each one really means, how to calculate it, and how to read them together to find what’s actually holding your campaign back.
Every Google Ads metric comes from five raw numbers. CTR is clicks ÷ impressions, CPC is cost ÷ clicks, conversion rate is conversions ÷ clicks, CPA is cost ÷ conversions, and ROAS is revenue ÷ cost. For most businesses, CPA and ROAS matter most because they tie spend directly to results. Use the calculator below to get all six from your own numbers.
Every Google Ads metric is a ratio of a few raw numbers
Metrics feel intimidating until you notice they all come from five raw counts: impressions, clicks, cost, conversions and revenue. Learn how those combine and you can read any account at a glance.
Here are the formulas in one place — the calculator below does the maths for you, but it helps to know what each line means.
CPA = cost ÷ conversions • ROAS = revenue ÷ cost • CPM = (cost ÷ impressions) × 1000
Google Ads metrics calculator
Enter your campaign numbers to get CTR, CPC, conversion rate, CPA, ROAS and CPM instantly — plus a quick read on where the weak spot is.
What each metric actually tells you
| Metric | Reads as | What it tells you |
|---|---|---|
| CTR | clicks ÷ impressions | How compelling and relevant your ad is. |
| CPC | cost ÷ clicks | What each visit costs you. |
| Conv. rate | conversions ÷ clicks | How well clicks turn into customers — mostly a landing-page signal. |
| CPA | cost ÷ conversions | What each customer costs to win. |
| ROAS | revenue ÷ cost | The profitability headline — rupees back per rupee in. |
| CPM | cost per 1,000 views | Useful for awareness, where clicks aren’t the goal. |
No single metric tells the truth alone
The skill is reading metrics in pairs — one describes the ad, the next describes what happens after the click.
- High CTR + low conversion rate → the ad works, but the landing page leaks. This is the most common pattern in 2026 — across nearly every industry, click-through rates rose while conversion rates fell, which means the bottleneck has shifted from the ad to the page.
- Low CPC + high CPA → cheap clicks that don’t convert. Cheap traffic isn’t the same as good traffic.
- High CPC alone → often a Quality Score issue. Lifting a keyword’s Quality Score from 5 to 8 can cut its CPC by roughly 30%.
What a “good” number looks like in 2026
Treat benchmarks as directional, not targets — they swing hugely by industry. As a rough cross-industry guide for Search in 2026:
- CTR: roughly 3–6% is typical; below 3% usually signals an ad-relevance or Quality Score problem.
- Conversion rate: commonly around 4–5%, but high-intent verticals run much higher and B2B much lower.
- CPC: enormously variable — cheap for ecommerce, very expensive for legal and finance. Judge it only against your own conversion value.
- ROAS: ecommerce often targets 3–5x, but your break-even depends on your margins.
- Every metric is built from five raw counts: impressions, clicks, cost, conversions, revenue.
- CTR = clicks/impr, CPC = cost/clicks, conv. rate = conv/clicks, CPA = cost/conv, ROAS = revenue/cost.
- Read metrics in pairs — the ad versus what happens after the click.
- In 2026, high CTR with low conversion rate usually means the landing page, not the ad, is the problem.
- CPA and ROAS are the headline numbers; judge CPC against conversion value, never alone.
Google Ads metrics FAQs
How do I calculate ROAS in Google Ads?
What is the difference between CPC and CPA?
How is CTR calculated?
What is a good ROAS for Google Ads?
Why is my CTR high but conversion rate low?
Which Google Ads metric is most important?
Related lessons
Want help making your numbers add up?
If your metrics look fine but the profit isn’t there, I can help you find the leak and fix it.
Get in touch →