SellerUtils

Break-Even CPA Calculator

Break-even CPA is the most you can spend on ads to get one order without losing money. The formula is Break-even CPA = selling price − the variable costs entered per order. Add your conversion rate for a max CPC, and repeat purchases for an ad-only customer acquisition limit.

Your numbers per order

$

Average order value, excluding VAT / sales tax.

$
$
%

Enter your rate; 2.9% is an example, not a current fee quote.

$

e.g. 0.30 per transaction

%

Commission on the sale, if any

$
%

Revenue refunded, not order return rate. Inventory recovery and return shipping are not modelled.

%

Share of ad clicks that order, for max CPC.

Average lifetime orders; 1 = first order only.

Results

Break-even CPA

$27.25

You can spend up to $27.25 in ads to win one order and still break even. Spend more per order and each sale loses money.
Max CPC
$0.68
Break-even ROAS
1.83
Margin before ads
54.5%
Profit per order before ads
$27.25

Including repeat purchases

Set orders per customer above 1 to see how much you can spend to acquire a customer who comes back.
Cost breakdown per order
Product cost$15.00
Shipping & fulfilment$5.00
Payment fees$1.75
Platform fee$0.00
Packaging & other$1.00
Returns & refunds$0.00
Total costs before ads$22.75

Profitability estimates use the costs or pre-ad margin you enter. They represent contribution before fixed overhead and taxes, not business net profit. Read the formulas and assumptions.

How to use this calculator

  1. Enter your selling price per order, excluding VAT or sales tax.
  2. Add every variable cost per order: product cost, shipping, payment fees, marketplace fees, packaging and returns.
  3. Optionally add your conversion rate to turn the result into a maximum cost per click, and orders per customer to include repeat purchases.

Break-even CPA formula

Break-even CPA = Price − COGS − Shipping − Payment fees − Platform fees − Other costs − Returns

In other words, break-even CPA is your profit per order before ad spend. Spend exactly that much on ads per order and you break even; spend less and you profit. Two useful extensions:

  • Max CPC = Break-even CPA × Conversion rate
  • Ad-only CAC limit = Break-even CPA × Orders per customer

Worked example

You sell a product for $50. It costs $15 to make, $5 to ship and $1 to pack, and card processing costs 2.9% + $0.30.

  • Payment fee: $50 × 2.9% + $0.30 = $1.75
  • Total costs: $15 + $5 + $1.75 + $1 = $22.75
  • Break-even CPA: $50 − $22.75 = $27.25
  • If 2.5% of ad clicks become orders, max CPC: $27.25 × 2.5% ≈ $0.68
  • If the average customer places 1.5 orders, ad-only CAC limit: $27.25 × 1.5 ≈ $40.88

From break-even CPA to max CPC

Search and shopping ads are usually bought per click, not per order. Your conversion rate connects the two: if 1 in 40 clicks (2.5%) becomes an order, each order costs 40 clicks, so each click can cost at most one fortieth of your break-even CPA. Improve the conversion rate and you can afford to pay more per click.

First order vs lifetime value

Judging ads on the first order alone is the safest approach: every order pays for its own acquisition. If customers reliably come back, you can afford to spend more to win them, up to the ad-only acquisition limit estimated here. This is not a measurement of fully loaded CAC, which can include sales and marketing overhead. The trade-off is cash flow: you pay for the ad now and earn the repeat profit later, and repeat orders often need email or retargeting spend of their own.

Break-even CPA vs break-even ROAS

Both describe the same limit. Break-even ROAS = Price ÷ Break-even CPA, so the $50 order above has a break-even ROAS of about 1.83. Use CPA when you bid per order or per conversion, and ROAS when you bid on revenue; the break-even ROAS calculator and target ROAS calculator cover the revenue view.

Frequently asked questions

What is break-even CPA?

Break-even CPA (cost per acquisition) is the most you can spend on ads to get one order without losing money. At that cost, ad spend uses up exactly the profit the order makes.

How do you calculate break-even CPA?

Subtract every variable cost of an order from its selling price: product cost, shipping, payment fees, platform fees, packaging and returns. What is left, the profit before ads, is your break-even CPA. A $50 order with $22.75 of costs has a break-even CPA of $27.25.

What is the difference between CPA and CAC?

CPA usually means the ad cost of one conversion, such as an order. CAC (customer acquisition cost) is the cost of winning a new customer, and is often weighed against the profit that customer brings over time. They coincide only when the conversion is a new customer's first order and both use the same cost basis. Fully loaded CAC may include sales and marketing overhead. This tool estimates an ad-only acquisition limit; repeat orders can increase that limit under the stated assumptions.

How does break-even CPA relate to break-even ROAS?

Break-even ROAS = selling price ÷ break-even CPA. A $50 order with a $27.25 break-even CPA has a break-even ROAS of about 1.83. Both describe the same limit, one per order and one per unit of revenue.

How do I calculate my maximum CPC?

Multiply your break-even CPA by your conversion rate. With a $27.25 break-even CPA and 2.5% of clicks becoming orders, you can pay up to about $0.68 per click before losing money.

Should I include repeat purchases?

Only if you have reliable data on how often customers come back. Counting repeat orders lets you bid higher for new customers, but the extra profit arrives later, repeat orders may need their own marketing, and you need the cash to cover the gap.

Why is my break-even CPA negative?

A negative result means your costs per order are higher than your selling price, so you lose money before spending anything on ads. No CPA is affordable until you raise the price or cut costs.

By the SellerUtils team · Last updated October 1, 2026. Results are estimates for planning and are not financial advice.

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