Cost Per Click (CPC) Calculator
Cost per click, and the break-even click: what a click is worth at your conversion rate and margin, which is the number that says whether your CPC is cheap.
Spend $4,260.00
Clicks 3,000
Cost per click $1.42
Impressions 142,000
Click-through rate 2.11%
Cost per thousand impressions $30.00
Conversion rate 2.5%
Revenue per conversion $120.00
Gross margin 78%
Gross profit per conversion $93.60
Conversions from these clicks 75.0
Cost per conversion $56.80
Break-even cost per click $2.34
Headroom per click $0.92
Value to cost ratio 1.65 to 1
A click is worth $2.34 to you: 2.5% of clicks convert, and each
conversion leaves $93.60 of gross profit. That is the break-even bid,
and it is the number that decides whether $1.42 is cheap or expensive.
There is no such thing as a high CPC in the abstract.
At $1.42 you are $0.92 under break-even on every click, so the campaign
makes gross profit before any of the costs that are not in these
numbers. Raising the bid buys volume until the headroom runs out.
The three ad metrics are one identity: cost per thousand impressions
equals the cost per click times the click-through rate times a thousand.
Here $1.42 at 2.11% gives $30.00. A CPM that falls while the CPC rises
means the creative is being shown more and clicked less.
Gross profit, not revenue, is what pays for a click. Using revenue makes
the break-even bid look larger by exactly your cost of goods, and that
gap is where most unprofitable accounts live.
Output is valid and updates as you type.
Fix the highlighted fields to update the output.
Spend divided by clicks is the easy half. The half that decides whether a campaign works is the other number this prints: what a click is worth to you, which is your conversion rate times the gross profit on a conversion.
That is the break-even bid. Under it the campaign makes money, over it more volume loses more money, and no amount of work further down the funnel rescues a click that costs more than it can return.
How to use
- Put in the spend and the clicks it bought.
- Add impressions if you have them, for the click-through rate and the CPM.
- Fill in the conversion rate, the revenue per conversion and your gross margin. That is what turns a CPC into a verdict.
Example
4,260 of spend, 3,000 clicks, 142,000 impressions, a 2.5 percent conversion rate, a 120 order and a 78 percent gross margin:
Spend $4,260.00
Clicks 3,000
Cost per click $1.42
Impressions 142,000
Click-through rate 2.11%
Cost per thousand impressions $30.00
Conversion rate 2.5%
Revenue per conversion $120.00
Gross margin 78%
Gross profit per conversion $93.60
Conversions from these clicks 75.0
Cost per conversion $56.80
Break-even cost per click $2.34
Headroom per click $0.92
Value to cost ratio 1.65 to 1A click is worth 2.34, you are paying 1.42, so there is 92 cents of headroom on every click. That is the useful reading, and it is also the answer to “should we bid more”: yes, until the headroom is gone.
Run the same campaign on revenue instead of gross profit and the break-even bid reads 3.00. The difference is exactly your cost of goods, and bidding into it is how accounts lose money while every dashboard stays green.
Pitfalls
There is no such thing as an expensive CPC in the abstract. A 40 CPC is a bargain for a customer worth 8,000 and ruinous for a 60 order. The only comparison that means anything is against what a click is worth to you.
Gross profit pays for clicks, not revenue. Using revenue inflates the break-even bid by your whole cost of goods. On a 30 percent margin it triples it.
Conversion rate here is of clicks, not impressions. Mixing the two produces a break-even bid about fifty times too low, which looks like a reason to switch the campaign off.
Average CPC hides the distribution. Search accounts routinely have a handful of terms taking half the spend at twice the average cost. The average is fine for the report and useless for the optimisation; run the numbers per term or per campaign.
The break-even bid is a gross-profit floor, not a target. Fulfilment, support, returns and the salary of whoever runs the account are all still to come. Bid at break-even and you have a campaign that converts and a business that does not.
Auction prices move when you bid. The CPC you paid at this volume is not the CPC you will pay at twice it. Headroom buys volume up to a point, and then the point moves.
Compatibility
Arithmetic in the browser: nothing is uploaded and nothing is stored. The share link carries the figures, so a bid recommendation can travel with the reasoning attached.
The three ad numbers are one identity: CPM equals CPC times CTR times a thousand. If you have any two of spend, clicks and impressions this page gives you all three, and the CPM and CTR calculators on this site are the same identity entered from the other two directions.
Nothing here is specific to one ad platform. Google, Meta, LinkedIn, Amazon and a sponsorship on a newsletter all produce a spend and a click count, and the break-even bid is a fact about your business rather than about theirs.