Business Finance
CTR Calculator
Find your ad click-through rate from clicks and impressions, or work backward from a target. Add campaign spend to see how CTR, cost per click and CPM describe the same delivery.
Your result
From exposure to clicks
Enter clicks and impressions to find CTR. Add spend to see how CPC and CPM describe the same campaign.
The method
One campaign, three different denominators
CTR divides ad clicks by ad impressions and multiplies by 100. To meet a target from a fixed impression count, round the needed clicks up to a whole click. For a fixed click goal, round the permitted impression count down: one more impression may push CTR below target. Optional effective CPC divides spend by clicks; CPM divides the same spend by impressions and multiplies by 1,000. Use one campaign, period and reporting basis for all inputs.
Example 1
The same $1,200 campaign in three measures
A campaign spends $1,200 for 150,000 impressions and 300 clicks. Its CTR is 0.20%; effective CPC is $4.00 and CPM is $8.00. These rates answer engagement, click cost and delivery cost respectively; none determines the quality or value of customers.
- Impressions
- 150,000
- Clicks
- 300
- CTR
- 0.20%
- Effective CPC
- $4.00
- CPM
- $8.00
Example 2
A target needs a whole-click boundary
At 150,000 impressions, a 0.40% CTR needs at least 600 clicks. With $1,200 unchanged spend, effective CPC would be $2.00. In the reverse direction, 200 clicks meet 2.50% CTR at no more than 8,000 impressions; 8,001 would fall below the target. Neither plan forecasts platform delivery.
- Click goal at 0.40%
- 600 minimum
- Fixed spend
- $1,200.00
- Effective CPC at goal
- $2.00
- 200 clicks at 2.50%
- 8,000 impressions maximum
Before you calculate
Assumptions & limits
- Clicks and impressions are whole ad-platform counts from the same campaign, period and impression basis. This simple model requires clicks no greater than impressions; some other platform definitions may differ.
- CTR measures clicks per impression, not email click-to-open rate, unique people, leads or customers. No universal good-CTR benchmark is assumed.
- Entered impressions are 1 to 1,000,000,000,000; clicks are 0 to that amount and may not exceed impressions in actual-rate mode. Target CTR is 0.0001% to 100% with up to four decimal places.
- Optional USD spend is $0 to $1,000,000,000 with at most two decimals. Effective CPC is undefined when clicks are zero. Displayed rates round to cents; click and impression boundaries use exact integer arithmetic.
- Target calculations hold other inputs fixed only to illustrate the threshold. They do not forecast clicks, impression delivery, auction prices, conversions or profit.
Keep in mind
Common mix-ups
CTR is not conversion rate
Clicks show interaction with an ad. Conversion rate uses a separately defined outcome and denominator. Do not treat a high CTR as evidence of sales.
A low CPM can still mean expensive clicks
CPM uses impressions; CPC uses clicks. With the same spend, weak CTR means fewer clicks and a higher effective CPC. Check both before comparing campaigns.
Rounding the boundary the wrong way
Minimum clicks round up; maximum impressions round down. Rounding impressions up can put the achieved CTR below your target.
Sources & calculation notes
Defines ad CTR as clicks divided by impressions. The exact whole-number boundary and worked examples are BiznTools calculations.
Defines average CPC as total click cost divided by clicks. The optional reconciliation uses user-entered spend.
Calculation and input rules checked: . Engineering validation; no professional accounting review is claimed.