How is customer acquisition cost calculated?

CAC = total sales and marketing spend / new customers acquired in the same period. Include ad spend, tool costs, agency fees, and the salaries of people working on acquisition. If you spent $5,000 last month and closed 50 customers, your CAC is $100.

What is a good LTV to CAC ratio?

The standard benchmark is 3:1 - a customer should be worth at least three times what you paid to acquire them. Below 1:1 you lose money on every customer. Above 5:1 you may be underinvesting in growth and could scale spend more aggressively.

What is CAC payback period?

The number of months it takes to earn back your acquisition cost from a customer's gross profit. If CAC is $300 and each customer generates $50 of monthly gross profit, payback is 6 months. Under 12 months is considered healthy for early-stage SaaS.

How do I lower my customer acquisition cost?

Shift the mix toward channels with zero marginal cost: SEO, content, referrals, and directory listings. Paid channels have a floor price set by the auction; organic channels get cheaper per customer as they compound. Building domain authority through directory backlinks makes every future piece of content rank better, steadily lowering blended CAC.

CAC Calculator: Customer Acquisition Cost (Free)

The CAC Formula and What to Include

Formula

CAC = sales & marketing spend / new customers acquired

Example: $5,000 / 50 customers = $100 per customer

The formula is trivial; the judgment is in the numerator. A complete CAC includes:

Ad spend across all paid channels
Marketing tools and software subscriptions
Agency and freelancer fees
Content production costs
Fully-loaded salaries of everyone working on acquisition

Startups that count only ad spend report a flattering "paid CAC" that falls apart the moment a hire joins the marketing team. The honest number is less pretty and far more useful.

CAC Only Makes Sense Next to LTV

A $500 acquisition cost is fantastic for a product with $5,000 lifetime value and fatal for one worth $600. That is why this calculator pairs CAC with the LTV:CAC ratio, the most-watched efficiency metric in SaaS. Investors read it as: for every dollar put into acquisition, how many dollars of customer value come out?

Segment CAC by channel as soon as you have the data. Blended CAC hides the story: paid ads might cost $400 per customer while organic search and directory referrals cost effectively $0 marginal. Knowing the split tells you where the next dollar should go.

CAC Payback Period: The Cash-Flow View

The LTV:CAC ratio tells you if acquisition is profitable eventually; payback period tells you how long your cash is locked up. Payback = CAC / monthly gross profit per customer. At $300 CAC and $50 monthly gross profit, you wait 6 months to break even on each customer. Under 12 months is the standard benchmark for early-stage SaaS; bootstrapped companies often need much faster payback because they cannot finance the gap with venture capital.

One naming collision worth flagging: in medicine, a "CAC calculator" scores coronary artery calcium from a heart scan. This page is strictly the customer acquisition cost calculator for business metrics.

Calculate your LTV input with the LTV calculator. And if your blended CAC is creeping up, the cheapest counterweight is organic acquisition: our free startup directories list and directory submission guide show how founders build zero-CAC referral and search channels.

Free CAC Calculator

The CAC Formula and What to Include

CAC Only Makes Sense Next to LTV

CAC Payback Period: The Cash-Flow View

CAC Calculator FAQ

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