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🎚️ Break-Even CPA Calculator

Your break-even CPA is the ceiling on what you can pay for a customer. Enter your price and costs to find it — then keep your actual cost per purchase comfortably below it.

$0$500
$0$200
0%10%
Break-Even CPA
$31.58
Max cost per sale to break even
CPA for 20% Margin
$21.78
Comfortable profitability target
Max CPC (at 1% CVR)
$0.32
Assuming 1% store CVR
Gross Profit / Order
$31.58
Your break-even CPA is $31.58 — the most you can pay per sale before you lose money. Keep actual CPA comfortably below this.
Formula:Break-Even CPA = Selling Price − COGS − All Fees
Industry Benchmarks
Healthy CPA roomGross margin > $25
TightGross margin $10–$25
UnprofitableGross margin under $10
Recommended next step

How to use this tool

  1. Enter your selling price. The price the customer pays at checkout.
  2. Enter product + shipping cost. Your total landed cost from the supplier.
  3. Enter payment fees. Your processor fee as a percentage, usually around 2.9%.
  4. Read your break-even CPA. The calculator shows the max CPA to break even, plus the CPA that still leaves a 20% net margin.

Break-Even CPA Calculator — explained

Break-even CPA equals your gross profit per order: Selling Price − Product/Shipping Cost − Payment Fees. If you pay exactly that to acquire a customer, you make zero. Pay more and every sale loses money, no matter how good the revenue looks.

This is the single most useful guardrail in a kill/scale decision. Watch your cost per purchase in Ads Manager against this number: comfortably below it means scale, hovering at it means tune, consistently above it means kill.

To give yourself a profit cushion, target a CPA below break-even by your desired margin. The calculator also shows the CPA that preserves a 20% net margin so you have a working target, not just a ceiling.

Use this in context

Break-Even CPA Calculator — common questions

How do you calculate break-even CPA?
Break-even CPA = Selling Price − Product/Shipping Cost − Payment Fees. It equals your gross profit per order — the most you can pay for a sale before losing money.
What is the difference between CPA and break-even CPA?
CPA is what you actually pay to acquire a customer. Break-even CPA is the maximum you can pay before a sale becomes unprofitable. Stay below it to make money.
How does break-even CPA relate to ROAS?
They are two views of the same limit. Break-even CPA is a dollar amount per sale; break-even ROAS is the revenue-to-spend ratio. Both tell you when an ad stops being profitable.
What CPA should I aim for?
Aim below break-even by your target margin. If your break-even CPA is $30 and you want a 20% net margin on a $50 product, target a CPA around $20.
Original content by First Sale Society — . Free, no paywall.