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Max bid calculator (max CPC)

Enter the CPA you can afford and your conversion rate to see the highest bid (max CPC) you can pay per click.

$

The cost per acquisition you can afford.

%

The share of clicks that end in a conversion.

Enter your target CPA and conversion rate to get the highest bid you can pay.

What’s a max bid?

It’s the highest cost per click you can pay without exceeding your target CPA. The formula is simple: max CPC = target CPA × conversion rate. If one in twenty clicks converts and you can afford $40 per acquisition, you can pay up to $2 a click.

Where your target CPA comes from

Your target CPA is the margin you make on a customer, or the break-even CPA you set yourself. You can figure it out with the CPA calculator or, if your customers come back, with customer lifetime value, which often justifies a more aggressive bid.

Max bid and automated bidding

Even with Smart Bidding, it pays to know your max CPC: it tells you whether a segment makes economic sense and helps you set target CPAs the algorithm can actually hit. It’s a profitability guardrail, not just a manual bidding setting.

Common questions

How do you calculate a max bid?

Your max bid, or max CPC, is your target CPA multiplied by your conversion rate. For example, with a target CPA of $40 and a conversion rate of 5%, max CPC is 40 × 0.05 = $2. Above that, every acquisition costs more than your target.

Why not just bid as low as possible?

A bid that’s too low costs you volume and ad position: you miss clicks that would have paid off. The goal isn’t the lowest CPC, it’s the highest CPC that’s still profitable. The max bid is exactly that ceiling: above it, you lose money.

Max bid or target CPA with automated bidding?

Most accounts run on Smart Bidding (Target CPA or Target ROAS) these days. Max CPC is still a useful benchmark: it helps you judge whether a keyword or a segment is viable, set realistic target CPAs, and manage the campaigns still on manual bidding.

Other calculators

ROAS calculatorCPA calculatorAd budget calculatorBreak-even calculatorConversion rate calculatorCPM, CPC and CTR calculatorCustomer lifetime value (LTV) calculator

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