CPM, CPC and CTR Calculator
All three fall out of the same three numbers. With 250,000 impressions, 3,000 clicks and 1,500,000 of spend: CPC is 1,500,000÷3,000 = 500, CPM is 1,500,000÷250,000 × 1,000 = 6,000, and CTR is 3,000÷250,000 = 1.2%. They are locked together as CPC = CPM ÷ 1000 ÷ CTR, so fixing one leaves the other two determining each other. Hold CPM at 6,000 and lift CTR from 1.2% to 2% and CPC drops from 500 to 300.
Your numbers
CPC
500
CPM
6,000
CTR
1.2%
CPC at that CTR
300
Formula
CPC = Ad spend ÷ Clicks, CPM = Ad spend ÷ Impressions × 1000, CTR = Clicks ÷ Impressions × 100
Auction competition sets CPM; the creative sets CTR. Cutting your bid to lower CPC just buys fewer impressions, whereas a better creative lowers CPC in inverse proportion at the same CPM. Pulling impressions and clicks from different date ranges makes CTR meaningless.
What to enter
| Input | Default | Accepted range |
|---|---|---|
| ImpressionsHow many times the ad was shown — times, not people. | 250,000 | 0 and up |
| ClicksHow many times the ad was clicked through. | 3,000 | 0 and up |
| Ad spendWhat you spent on ads in the period; production costs are usually counted apart. | 1,500,000 | 0 and up |
| Target CTR (%)The click-through rate you hope a better creative reaches. | 2 | 0 ~ 100 |
Step by step
Quick reference table
Results when only Clicks changes and everything else stays put.
| Clicks | CPC | CPM | CTR (%) |
|---|---|---|---|
| 1,500 | 1,000 | 6,000 | 0.6 |
| 2,250 | 666.67 | 6,000 | 0.9 |
| 3,000 | 500 | 6,000 | 1.2 |
| 4,500 | 333.33 | 6,000 | 1.8 |
| 6,000 | 250 | 6,000 | 2.4 |
What each result means
| Result | At default values |
|---|---|
| CPCWhat one click cost — spend divided by clicks. | 500 |
| CPMCost for a thousand impressions; auction competition sets it. | 6,000 |
| CTR (%)The share of impressions that turned into clicks; the creative sets it. | 1.2 |
| CPC at that CTRCPC at that click-through rate if CPM holds — the two move inversely. | 300 |
Common mistakes
Auction competition sets CPM; the creative sets CTR. Cutting your bid to lower CPC just buys fewer impressions, whereas a better creative lowers CPC in inverse proportion at the same CPM. Pulling impressions and clicks from different date ranges makes CTR meaningless.
Glossary
- Impressions
- How many times the ad was shown — times, not people.
- Clicks
- How many times the ad was clicked through.
- Ad spend
- What you spent on ads in the period; production costs are usually counted apart.
- Target CTR
- The click-through rate you hope a better creative reaches.
- CPC
- What one click cost — spend divided by clicks.
- CPM
- Cost for a thousand impressions; auction competition sets it.
- CTR
- The share of impressions that turned into clicks; the creative sets it.
- CPC at that CTR
- CPC at that click-through rate if CPM holds — the two move inversely.
Frequently asked questions
Q. How is CPM, CPC and CTR Calculator calculated?
CPC = Ad spend ÷ Clicks, CPM = Ad spend ÷ Impressions × 1000, CTR = Clicks ÷ Impressions × 100 — All three fall out of the same three numbers. With 250,000 impressions, 3,000 clicks and 1,500,000 of spend: CPC is 1,500,000÷3,000 = 500, CPM is 1,500,000÷250,000 × 1,000 = 6,000, and CTR is 3,000÷250,000 = 1.2%. They are locked together as CPC = CPM ÷ 1000 ÷ CTR, so fixing one leaves the other two determining each other. Hold CPM at 6,000 and lift CTR from 1.2% to 2% and CPC drops from 500 to 300.
Q. Can you walk through an example?
With Impressions 250,000, Clicks 3,000, Ad spend 1,500,000, Target CTR 2%, the answer is CPC 500.
Q. What do I need to enter?
Enter Impressions, Clicks, Ad spend, Target CTR. The result recalculates as you type, and an empty box counts as zero.
Q. How much does the answer move if I change a number?
Changing only Clicks moves the answer to Clicks 1,500 → CPC 1,000 and Clicks 6,000 → CPC 250. The table below lays out five steps.
Q. How are the numbers rounded?
Money is shown to the nearest whole unit, percentages to one decimal place and everything else to two. What you see is rounded; the calculation itself carries the unrounded value forward.
Q. Anything to watch out for?
Auction competition sets CPM; the creative sets CTR. Cutting your bid to lower CPC just buys fewer impressions, whereas a better creative lowers CPC in inverse proportion at the same CPM. Pulling impressions and clicks from different date ranges makes CTR meaningless.
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