Short answer: CTR is clicks divided by impressions. CPC is cost divided by clicks. CPM is cost per 1,000 impressions. CPL or CPA is cost divided by leads or customers. ROAS is revenue from ads divided by ad spend. For most businesses, cost per lead or customer and ROAS matter more than CTR or CPC alone.
Below, CPC, CPM, CTR and ROAS are explained with one worked example. Ad dashboards show dozens of numbers. Business owners and new marketers often focus on the wrong ones, such as celebrating a cheap CPC while leads stay expensive. This guide explains the core metrics with one simple rupee example so you can see how they connect.
The Example Campaign
A Faridabad furniture shop runs a Meta ad campaign:
- Ad spend: ₹10,000
- Impressions: 2,00,000
- Clicks: 2,000
- Leads (WhatsApp enquiries): 80
- Customers: 8
- Revenue from those customers: ₱1,20,000
The Metrics, Calculated
| Metric | Formula | Example result |
|---|---|---|
| CTR (click-through rate) | Clicks / Impressions x 100 | 2,000 / 2,00,000 = 1% |
| CPC (cost per click) | Spend / Clicks | ₹10,000 / 2,000 = ₹5 |
| CPM (cost per 1,000 impressions) | Spend / Impressions x 1,000 | ₹10,000 / 2,00,000 x 1,000 = ₹50 |
| Conversion rate (click to lead) | Leads / Clicks x 100 | 80 / 2,000 = 4% |
| CPL (cost per lead) | Spend / Leads | ₹10,000 / 80 = ₹125 |
| Lead to customer rate | Customers / Leads x 100 | 8 / 80 = 10% |
| CPA (cost per acquisition) | Spend / Customers | ₹10,000 / 8 = ₹1,250 |
| ROAS (return on ad spend) | Revenue / Spend | ₹1,20,000 / ₹10,000 = 12x |
What Each Metric Tells You
- CTR: whether the ad grabs attention and matches the audience. Low CTR suggests weak creative or poor targeting.
- CPC: the price of attention. It depends on competition and ad quality.
- CPM: the cost of reaching people; useful for awareness campaigns.
- Conversion rate: how well the landing page or chat converts visitors.
- CPL: what you pay for each enquiry.
- CPA: what you pay for each customer. This is what really matters.
- ROAS: how much revenue each rupee of ads brings back.
Why Cheap Clicks Can Be Expensive
Imagine a second campaign with a CPC of ₹2 but only 10 leads and 1 customer for the same ₹10,000. Its CPA is ₹10,000, eight times worse than the first campaign, despite cheaper clicks. Always follow the numbers through to customers and revenue.
ROAS vs Profit
ROAS uses revenue, not profit. If the furniture shop’s profit margin is 25%, ₹1,20,000 revenue means about ₹30,000 profit before ad costs, so after ₹10,000 ad spend the campaign earned roughly ₹20,000. A ROAS that looks good can still lose money if margins are thin. Calculate your break-even ROAS: 1 divided by profit margin. At 25% margin, break-even ROAS is 4x.
Which Metrics Should You Watch?
- Lead generation businesses: CPL, lead quality and CPA
- E-commerce: ROAS, CPA and profit after ad spend
- Awareness campaigns: CPM, reach and frequency
- Diagnostics: CTR and conversion rate to find where a campaign is weak
Learn to Read Ad Data
At AdifySkills in Sector 81, Faridabad, students calculate these metrics on live campaigns with real budgets and learn to turn numbers into decisions.
Key takeaways on CPC
- A Faridabad furniture shop runs a Meta ad campaign:
Ad spend: ₹10,000
Impressions: 2,00,000
Clicks: 2,000
Leads (WhatsApp enquiries): 80
Customers: 8
Revenue f - MetricFormulaExample result
CTR (click-through rate)Clicks / Impressions x 1002,000 / 2,00,000 = 1%
CPC (cost per click)Spend / Clicks₹10,000 / 2,000 = ₹5
CPM - CTR: whether the ad grabs attention and matches the audience.
- Imagine a second campaign with a CPC of ₹2 but only 10 leads and 1 customer for the same ₹10,000.
- ROAS uses revenue, not profit. If the furniture shop's profit margin is 25%, ₹1,20,000 revenue means about ₹30,000 profit before ad costs, so after ₹10,000 ad spend the campaign earned roughly ₹20,000.
- Lead generation businesses: CPL, lead quality and CPA
E-commerce: ROAS, CPA and profit after ad spend
Awareness campaigns: CPM, reach and frequency
Diagnostics:
Further reading
Frequently Asked Questions
What is a good CTR?
It varies by platform, industry and ad type. Compare against your own past campaigns and similar campaigns, rather than a universal number.
What is the difference between CPA and CPL?
CPL is the cost per lead; CPA is usually the cost per final action such as a sale or booking.
Is high CPC bad?
Not necessarily. A high CPC can be fine if conversion rates and customer value are high.
How is ROAS different from ROI?
ROAS compares revenue with ad spend. ROI compares profit with total investment, including other costs.
Where do I find these numbers?
Ad platforms show CTR, CPC, CPM and conversions. Revenue and customer numbers often come from your sales records or CRM.
Related Reading
- Ad Copy and Copywriting: A Practical Guide for Beginners
- Digital Marketing Glossary: Key Terms Explained Simply
- Google Ads for Beginners: How the Auction Really Works
- Facebook Ads for Small Businesses: A Practical 2026 Guide
- Performance Marketing Course in Faridabad: Beyond the Basics
Want to learn this with live campaigns and a trainer beside you? See the full digital marketing course in Faridabad, or check admission and batch dates.