E-commerce Target CAC & ROAS Calculator


E-commerce Target CAC & ROAS Calculator

Calculate your target Customer Acquisition Cost (CAC) limits and required ad Return on Ad Spend (ROAS) to protect store profit margins.

1. Order Economics

$

$

$

2. Target Margin
Target Profit Margin per Order
20%

Target CAC Limit
$27.75

Target ad ROAS
2.70x

Order Revenue Allocation
$75.00 AOV


COGS + Ship: $30.00
Max CAC: $27.75
Net Profit: $15.00

Evaluation Parameter Calculated Values
Contribution Margin per Order $42.75
Target Profit Amount per Order $15.00
Target Customer Acquisition Cost (CAC) $27.75
Target ROAS (To hit profit goals) 2.70x
Breakeven ROAS (Ad spend pays for itself) 1.75x
Ad Budget Tip: Running campaigns at or below your Breakeven ROAS threshold means your business is losing money on every order once physical warehousing, shipping, and app overheads are accounted for.

What is E-commerce Target CAC and ROAS?

For online direct-to-consumer (DTC) brands, customer acquisition is the single largest operational cost. Standard marketing dashboards often focus on gross ad platform return (ROAS), misleading store owners into believing campaigns are profitable when they are actually draining capital. Our Target CAC & ROAS Calculator bridges the gap between ad manager metrics and actual e-commerce unit profits.

Understanding the Target CAC Formula

To determine the maximum budget you can afford to spend to buy a single customer while hitting your desired net profit goals, calculate your Target Customer Acquisition Cost (CAC):

Target CAC = AOV – COGS – Shipping – Processing Fees – Target Net Profit

Maintaining ad spending under this target ensures every order compounds net cash flow back into your company treasury.

How to Calculate Target ROAS and Breakeven ROAS

Ad managers (Facebook Ads Manager, Google Ads Dashboard) measure marketing performance using ROAS (Return on Ad Spend). To align these platforms with your business financials, convert your cost metrics into target ROAS ratios:

  • Target ROAS: The return ratio required to pay for product COGS, shipping, and fees while delivering your target net profit percentage. (AOV / Target CAC).
  • Breakeven ROAS: The exact threshold where ad revenues equal the product contribution margins. (AOV / Contribution Margin). Hitting below this number means you lose cash on every ad transaction.

Strategies to Optimize E-commerce Advertising Margins

  • Increase Average Order Value (AOV): Bundling products or adding post-purchase upsells dilutes your shipping and transaction fees, dramatically increasing your target CAC ceiling.
  • Improve Retention (LTV): High email marketing list conversion rates and customer loyalty apps generate repeat purchases, amortizing the initial ad CAC cost over multiple orders.