How is Breakeven CAC different from CAC Payback Period?

CAC Payback Period takes an actual CAC and tells you how many months it takes to recover. Breakeven CAC works the other way: you set the payback window you're willing to accept, and it tells you the maximum CAC that fits inside it.

What payback period should I use?

It depends on cash position and business model. SaaS companies commonly target 12 to 18 months; DTC and ecommerce businesses with faster repeat purchase cycles often use a much shorter window, sometimes a single order.

Does this account for repeat purchases?

Yes. The Orders per Month input is what bakes repeat purchases into the calculation, a customer who buys twice a month contributes twice the monthly gross profit of one who buys once, which raises the CAC ceiling accordingly.

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Revenue

Breakeven CAC Calculator

Breakeven CAC tells you the maximum customer acquisition cost you can afford, given your margin and how quickly you need to recover it, before a customer becomes a loss instead of a profit.

Order Economics

Average Order Value

COGS per Order

Shipping Cost

Payment Processing Fee

Purchase Frequency & Target

Avg Orders per Customer per Month

Target Payback Period

months

Breakeven CAC

612

What This Means

At $34.00 gross profit per order and 1.5 orders a month, monthly gross profit is $51.00. You can spend up to this much acquiring a customer and still recover it within 12 months.

Want the full picture, not just this one number?

Try the Unit Economics Calculator

The Formula

Breakeven CAC = (AOV − COGS − Shipping − Payment Fees) × Orders per Month × Target Payback Period

This builds the CAC Payback Period formula up from raw per-order costs instead of asking you to already know your gross margin, so it's the same underlying math (Average Revenue Per Account × Gross Margin × Payback Period), just derived from numbers you'd pull straight from an order or invoice.

Why It Matters

Most teams track CAC after the fact, once ad spend is already committed. Breakeven CAC flips that around, giving marketing and finance a spending ceiling to plan against before a campaign launches, not a number to react to afterward. Building it from raw order costs also surfaces where the ceiling actually comes from, a shipping cost increase or a payment processor fee hike lowers it just as much as a weaker margin would, which a single blended 'gross margin' input would hide.

Example

A store sells at a $60 AOV, with $18 in COGS, $6 in shipping, and $2 in payment processing per order, leaving $34 in gross profit per order. At 1.5 orders a month per customer, that's $51 in monthly gross profit. Over a 12-month target payback period, Breakeven CAC is $51 times 12, which equals $612. Any channel acquiring customers for less than that fits inside a 12-month payback target.

Frequently Asked Questions

CAC Payback Period takes an actual CAC and tells you how many months it takes to recover. Breakeven CAC works the other way: you set the payback window you're willing to accept, and it tells you the maximum CAC that fits inside it.
It depends on cash position and business model. SaaS companies commonly target 12 to 18 months; DTC and ecommerce businesses with faster repeat purchase cycles often use a much shorter window, sometimes a single order.
Yes. The Orders per Month input is what bakes repeat purchases into the calculation, a customer who buys twice a month contributes twice the monthly gross profit of one who buys once, which raises the CAC ceiling accordingly.

Related Calculators

CAC Payback Period Calculator LTV:CAC Ratio Calculator Customer Lifetime Value Calculator

From the Glossary

Customer Acquisition Cost (CAC)CAC Payback Period Gross Margin LTV:CAC Ratio

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