Max CPA Calculator

What can you afford per lead? · built by Lucas, Google Ads specialist for local businesses

The most you can pay to win a customer is the profit that customer brings — and the most you can pay per lead is that figure times your close rate. Enter your numbers below to see your break-even ceiling and a profitable target for cost per lead and cost per acquisition — the numbers to set your bids by.

Estimates only — make sure your margin already accounts for product/service costs. These are ceilings and targets to guide bids, not guarantees.

How this calculator works

It answers one question every advertiser should know the answer to: what can I afford to pay for a lead? The logic runs in three steps:

• Profit per customer = customer value × profit margin.
• Break-even max CPA = profit per customer (spend exactly this to win a customer and you make nothing — it's the ceiling).
• Break-even max cost per lead = break-even CPA × close rate.

The target matters more than the ceiling. If you pay your full per-customer profit to acquire each customer, you keep nothing. So set a target below break-even — this calculator lets you choose how much profit to keep, then shows the target cost per lead and per customer to bid toward.

Worked example

A $600 customer at a 50% margin earns $300 profit. That's your break-even max CPA. Close 1 in 4 leads (25%) and your break-even cost per lead is $300 × 25% = $75. Decide to keep half the profit, and your target CPA becomes $150 and your target cost per lead about $38 — the number to aim your bids at.

Why this is the number to bid by

Most advertisers guess their bids or chase a generic "good" cost per lead. But "good" only means anything relative to what a lead is worth to you. Knowing your max and target CPA lets you:

• Set Target CPA bidding correctly — feed Google a target below break-even so it optimizes toward profit, not just volume.
• Judge your current cost per lead — if it's under your target, scale; if it's over your break-even, fix or pause.
• Bid more where you can — high-value or high-close segments can profitably justify higher bids than competitors realize.

Frequently asked questions

Profit per customer (value × margin) is your break-even cost per customer. Multiply by your close rate for the break-even cost per lead. Set your target below those ceilings to stay profitable.

The highest you can pay to acquire a customer and still profit. Break-even max CPA equals the profit a customer brings; your target should sit below it so each customer earns money.

Google's Target CPA bidding hits an average cost per acquisition you set. This calculator gives you the right number — a target below break-even — instead of guessing.

No — break-even is the ceiling, not the target. Bid below it so each customer leaves a profit; the calculator shows the target based on how much profit you want to keep.