Break-Even ROAS & Target CPA Calculator

Break-even ROAS = 1 ÷ gross margin. That one number decides whether your Google Ads account is actually profitable — and it never appears anywhere inside Google Ads. Enter your margin below to get your break-even ROAS, the target to give Smart Bidding, and the most you can afford to pay for an order, a lead, or a click.

$

Average revenue per order.

%

Revenue left after cost of goods, shipping, fees.

%

Profit you want to keep, as % of revenue. 0 = break even.

Break-even ROAS

Below this, every ad dollar loses money.

2.50x

Break-even cost per order

The most you can pay ads for one order.

$48.00

Target ROAS for 10% net margin

Use this as your Smart Bidding target, not break-even.

3.33x

Runs entirely in your browser — nothing you type is sent or stored.

How the Formulas Work

Break-even ROAS

Break-even ROAS = 1 ÷ gross margin. If your gross margin is 40%, only $0.40 of every revenue dollar is available to pay for advertising — so you need $2.50 of revenue per $1 of ad spend (1 ÷ 0.40 = 2.5x) before ads stop losing money.

Target ROAS (the number to actually bid to)

Target ROAS = 1 ÷ (gross margin − desired net margin). Break-even is a floor, not a goal. If you want to keep 10% of revenue as profit on a 40% margin, the target becomes 1 ÷ (0.40 − 0.10) ≈ 3.33x — that's what belongs in your Smart Bidding target, not 2.5x.

Break-even cost per lead

Value per lead = revenue per deal × gross margin × close rate. Lead-gen businesses lose money in Google Ads when they bid to the value of a deal while buying leads. A $3,000 deal at 50% margin and a 20% close rate makes a lead worth $300 — pay more than that and growth is just an expensive way to shrink.

What this deliberately leaves out

Repeat purchases and lifetime value raise what you can afford to pay; brand-search cannibalization and mis-tracked conversions lower it. The formulas here are the honest first-order answer — refining them with your own retention and offline conversion data is exactly the kind of work a Google Ads consultant does before touching bids.

Frequently Asked Questions

What is break-even ROAS?
Break-even ROAS is the return on ad spend at which your advertising exactly covers its own cost — no profit, no loss. It equals 1 divided by your gross margin. At a 40% gross margin, break-even ROAS is 1 ÷ 0.40 = 2.5x: every $1 of ad spend must generate $2.50 of revenue just to break even.
What is the break-even ROAS formula?
Break-even ROAS = 1 ÷ gross margin (as a decimal). To aim for actual profit, use Target ROAS = 1 ÷ (gross margin − desired net margin). Example: 40% margin with a 10% desired net margin gives 1 ÷ (0.40 − 0.10) ≈ 3.33x.
How do I calculate a maximum cost per lead?
Multiply the average revenue of a closed deal by your gross margin, then by your lead-to-customer close rate. A $3,000 deal at 50% margin and a 20% close rate makes each lead worth $3,000 × 0.50 × 0.20 = $300 — the most you can pay for a lead and still break even.
Why does Google Ads report profit even when I'm losing money?
Google Ads reports revenue-based ROAS and ignores your costs of goods and delivery. A 2x ROAS looks positive but loses money for any business whose gross margin is below 50%. That gap between platform ROAS and real profitability is exactly what break-even ROAS exposes.
Should I set my Smart Bidding target to break-even ROAS?
No — break-even is the floor, not the target. Set your Target ROAS (or Target CPA) using the desired-profit version of the formula so bidding optimizes toward the margin you want to keep, and remember that platform-reported conversions overstate quality; validating with offline conversion data keeps the target honest.
Is this calculator free? Where does my data go?
It's free, requires no signup, and runs entirely in your browser. Nothing you type is transmitted or stored anywhere.

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