Your CPC isn't too high. Your break-even is too low.
A $1.20 click can be a bargain or a slow leak. How to work out the most you can afford to pay per click, and the three levers that raise it.
Achour Khattallah
Most store owners I talk to about ads open with the same complaint: clicks are too expensive. Sometimes that's true. More often, the click price is fine and the store simply can't afford it yet. Those are two very different problems, and only one of them gets fixed by fiddling with bids.
So before touching a campaign, I like to answer one question: what is the most this store can pay for a click and still make money? That number is your break-even CPC, and once you know it, "is $1.20 too much?" stops being a feeling and becomes arithmetic.
A store that looks fine on paper
Take a made-up shop selling linen shirts. Nothing about its numbers is unusual:
- Average cost per click
- $1.20
- Of visitors place an order
- 2.5%
- Average order value
- $60
- Gross margin per order
- 40%
A $1.20 click for a $60 product sounds reasonable. The ads platform reports a respectable stream of sales. Every month, though, the bank balance tells a different story.
The number that actually matters
Break-even CPC is what one click is worth to you, on average, in profit:
break-even CPC = order value × conversion rate × margin
= $60 × 0.025 × 0.40
= $0.60
That's the whole formula. Each click has a 2.5% chance of turning into a $60 order, and you keep 40% of that order1. On average, a click is worth sixty cents to this store. It's paying a dollar twenty.
Here's what that looks like over a month:
$1,875 of sales from $1,500 of ads reads like a win in most dashboards. After the cost of the shirts themselves, it's a $750 hole.
Try it with your own numbers
Plug in your store. The calculator starts with the shirt shop's figures:
Break-even CPC calculator
Move the sliders to match your store.
- Clicks
- 1,250
- Orders
- 31.3
- Revenue
- $1,875
- Profit after ads
- -$750
Your break-even CPC is $0.60. Each click costs $0.60 more than it earns back.
If the break-even line comes out below what you pay, no amount of bid tweaking will save the campaign for long. You need to change what a click is worth.
Three levers that raise your break-even
Look at the formula again. Every input is something you control on your own site, not inside the ads account.
- Conversion rate. Faster pages, clearer product photos, honest delivery times, fewer checkout steps. Going from 2.5% to 4% is hard work but not exotic.
- Average order value. Bundles, "complete the look" suggestions, a free-shipping threshold just above your typical basket.
- Margin. Better supplier terms, fewer discount codes, cutting the returns that come from vague size guides.
- Today$0.60
- Margin to 50%$0.75
- Order value to $90$0.90
- Conversion to 4%$0.96
- Conversion and order value$1.44
The store pays $1.20 per click. Only the combined change clears it.
No single lever gets this store over the line. Two of them together do, with room to spare. That's typical: the fix is rarely one heroic change, more often a few unglamorous ones that stack.
Then make the click itself cheaper
Once the store can afford its clicks, it's worth lowering what it pays for them. On Google Ads you don't simply pay your bid. Where your ad shows, and what it costs, also depends on how relevant Google thinks it is, which shows up in your account as Quality Score2.
In practice that means tight ad groups, ad copy that repeats what people searched for, and landing on the exact product rather than your homepage. Boring advice, and it works.
Why not just watch ROAS?
You can, as long as you know your break-even ROAS, which is 1 ÷ gross margin. At a 40% margin that's 2.5: every dollar of ads has to bring back $2.50 in sales just to stand still. The shirt shop's ROAS is 1.25. Break-even CPC and break-even ROAS tell the same story; CPC is just easier to compare with the number in your ads account.
A five-minute check for your store
If your break-even is comfortably above your CPC, you've earned the right to spend more. If it isn't, the most profitable thing you can do with your ads account this week might be to leave it alone and fix the store.