Three numbers that decidewhat traffic costs you.
CPC, CPM, and CTR are the same campaign seen from three angles. Enter what you know, spend, impressions, clicks, and get all three at once, then see exactly where each one lands against what advertisers actually pay.
Your numbers
Total spent on this campaign or ad set.
Times your ad was shown.
Clicks those impressions earned.
The verdict
CPC
$0.33
CPM
$5.00
CTR
1.5%
Clicks per 1k impressions
15
Cost per 1k clicks
$333
Scenario · creative quality is a cost lever
What a better CTR does to your CPC
CPC at that CTR
$0.25
vs your CPC
25.0%
Cheaper clicks, same CPM.
Holding CPM at $5.00, lifting CTR to 2.0% drops your CPC to $0.25. You convert more of the impressions you already paid for into clicks — which is why creative quality lowers cost, not just lifts brand.
Sensitivity · CPC by CTR
Same CPM, different click costs
| CTR | CPC | Clicks / 1k impr. |
|---|---|---|
| 0.5% | $1.00 | 5 |
| 1% | $0.50 | 10 |
| 1.5% | $0.33 | 15 |
| 2% | $0.25 | 20 |
| 3% | $0.17 | 30 |
| 5% | $0.10 | 50 |
CPC and CTR move inversely at a fixed CPM. A low CPC with a low CTR is cheap, low-intent traffic; a high CTR with a high CPC is an expensive but engaged audience. Read them together.
Your move
Cheap clicks aren't the goal. Profitable ones are.
CPC $0.33, CPM $5.00, CTR 1.5%.
These three numbers tell you how efficiently you're buying attention, but not whether that attention turns into money. Send me the account and I'll trace the click all the way to revenue and show you where it leaks.
Plain English
One campaign, three lenses.
CPM (cost per mille) is what you pay for a thousand impressions, the price of being seen. CPC (cost per click) is what you pay for a click, the price of attention. CTR (click through rate) is the percentage of people who clicked, the quality of the match between your ad and the people seeing it.
They're locked together by simple math: a great CTR drags your CPC down even when CPMs rise, because you're converting more of the impressions you already paid for into clicks. That's why creative quality is a cost lever, not just a brand one.
Read all three together. A low CPC with a low CTR usually means cheap, low intent traffic. A high CTR with a high CPC means an expensive but engaged audience. The story is in the combination, not any single figure.
The formula
CPC = CPM ÷ (10 × CTR%) · CTR = clicks ÷ impressions
$500 spend, 100,000 impressions, 1,500 clicks → CPM = $5.00, CTR = 1.5%, CPC = $0.33. Double the CTR to 3% and the same CPM yields a $0.17 CPC, half the cost per click for free.
What clicks actually cost
CPCs vary wildly by platform and intent, search clicks cost more because they're closer to a purchase. Average cost per click by channel:
| Platform | Avg CPC |
|---|---|
| Google Ads | $4.66 |
| Facebook Ads | $0.77 |
| Instagram Ads | $0.68 |
| LinkedIn Ads | $5.78 |
| TikTok Ads | $0.22 |
| Pinterest Ads | $0.80 |
Source: Whatagraph / industry CPC data · 2025
Read the three together
High CPM, decent CTR.
You're in an expensive auction (narrow audience or premium placement). Broaden the audience or test cheaper placements before blaming the creative.
Low CTR, any CPM.
The creative or the match is off. A weak hook means you pay for impressions that never become clicks, the most common silent cost.
High CTR, high CPC.
Engaged but pricey audience. Fine if they convert; check downstream CPL/CPA before deciding it's a problem.
Low CPC, low conversions.
Cheap clicks from low intent traffic. CPC looks great while the account loses money. Optimize for the conversion, not the click.
Bring the cost of a click down
01Lift CTR with the hook
The first second of the creative moves CTR more than anything, and CTR is the biggest lever on CPC.
02Tighten relevance
Match message to audience and placement; platforms reward relevance with lower costs.
03Test more creative
Volume of distinct angles finds the high CTR outliers that quietly slash CPC.
04Refresh before fatigue
CTR decays and CPM climbs as ads tire. Rotate creative on a schedule.
05Widen tight audiences
Over narrow targeting spikes CPM. Let the algorithm find buyers in a broader pool.
06Mind the placement mix
Some placements are far cheaper per click; exclude the ones that burn budget without converting.
The vocabulary
- CPC
- Cost per click, ad spend ÷ clicks.
- CPM
- Cost per mille, cost per 1,000 impressions: (spend ÷ impressions) × 1,000.
- CTR
- Click through rate, clicks ÷ impressions, as a percentage.
- Impression
- A single instance of your ad being shown to someone.
- Auction
- The real time bid that sets your CPM; tighter targeting and more advertisers raise it.
CPC, CPM & CTR questions
CPC = CPM ÷ (10 × CTR%). Raising CTR lowers CPC at the same CPM, because more of your paid impressions turn into clicks. They're three views of one campaign.
Keep going
A calculator tells you what. A call tells you what to do about it.
Send me the account behind these numbers. I'll tell you straight where the money's leaking and what I'd fix first — free, and you keep it whether you hire me or not.