Max CPC Calculator

Find the highest cost per click you can afford at your conversion rate and margin, before it eats into the profit you want to keep.

Your numbers

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Average order value

Contribution margin per order

Order value minus product cost, shipping and payment fees, before ad spend.

Conversion rate

Profit you want to keep per order

As a % of order value, left over after ads.

Your result · updates as you type

Highest CPC you can afford

$0.48

At a 2.5% conversion rate, paying more than $0.48 a click eats into the 10% profit you want to keep. Break-even is $0.62.

Break-even max CPC: $0.62
Max CPC for 10% profit: $0.48
Contribution per order: $24.75

Set this as your max CPC bid cap in Manual CPC or as a sanity check on Google's Smart Bidding suggestions. If your real CPC runs above this, the campaign needs a better conversion rate or margin, not just a lower bid.

Max CPC at other conversion rates

$0.19

1.5%

$0.29

$0.39

2.5%

$0.48

$0.58

$0.77

$0.96

Breakdown

Order value: $55.00
Contribution margin (45%): $24.75
Profit target (10%): −$5.50
Left for ads per order: $19.25
× conversion rate: $0.48

The highest CPC that still leaves a profit

A max CPC isn't just about not losing money. This calculator finds the highest click cost that still leaves the profit you actually want per order, using your conversion rate to turn a per-order budget into a per-click one.

Max CPC = (order value × margin − order value × profit target) × conversion rate

Example: the default numbers

Order value × margin: $55 × 45% = $24.75
Profit target (10% of order value): $5.50
Left for ads per order: 24.75 − 5.50 = $19.25
× conversion rate: $19.25 × 2.5%

Max CPC for the profit target is $0.48. Break-even max CPC (no profit target) is $0.62.

Setting bid caps

Manual CPC campaigns. Use this as your bid cap directly.
Smart Bidding campaigns. Use it as a sanity check: if the average CPC Google is paying runs well above this, the campaign needs a better conversion rate or margin, not just a lower bid.
Conversion rate moves this more than margin does. A CRO improvement that lifts conversion rate raises the max CPC you can afford by the same share.

Questions people ask

How do you calculate max CPC?

Multiply what's left per order after cost, fees and your profit target by your conversion rate. A lower conversion rate lowers the max CPC you can afford for the same order economics.

Should I bid at my break-even max CPC?

That leaves no profit. Bid at or below the max CPC that includes your target profit margin, and treat the break-even figure as an absolute ceiling, not a target.

Why does conversion rate matter so much here?

A lower conversion rate means more clicks are needed per order, so each individual click has to cost less to keep the per-order economics the same.

How is this different from break-even ROAS?

Break-even ROAS is a ratio of revenue to spend. Max CPC translates that into an actual bid number you can enter in an ads platform.

Last reviewed 30 September 2026.