Enter your acquisition spend and new customers for an instant, fully-loaded customer acquisition cost — and an LTV:CAC ratio that tells you whether the model scales.
For the period you are measuring.
Optional, and the difference between an honest CAC and a flattering one.
Optional. Gross profit over the whole relationship.
Drives the payback period.
Healthy. An LTV:CAC of 3:1 or better generally leaves room for overhead and profit.
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Customer acquisition cost is the average cost to acquire one new customer. It is the denominator of nearly every unit-economics decision: whether you can afford to scale spend, how much you can bid, and whether the business compounds or leaks. CAC = total acquisition cost ÷ new customers acquired in the same period.
The number is only as honest as its inputs. Ad-only CAC counts media spend alone; fully-loaded CAC adds the marketing salaries, contractor fees, and tooling that produced those customers. The gap between them can be large for teams with a small ad budget and a big headcount, and pretending the headcount is free is how a business convinces itself its acquisition is cheaper than it is.
A CAC of $200 is neither good nor bad on its own. What matters is the relationship between CAC and the lifetime value of the customer it buys. LTV:CAC expresses that relationship as a ratio: a customer worth $600 acquired for $200 gives a 3:1 ratio, generally regarded as the floor for a healthy, scalable model.
Below 1:1 you lose money on every acquisition and growth accelerates the loss. Between 1:1 and 3:1 the economics work but leave little margin for overhead, discounting, or a downturn, and scaling spend into that band usually makes things worse as CAC rises with volume. At 3:1 or above you have room to reinvest, and the constraint shifts from profitability to how fast you can spend without pushing CAC up.
LTV:CAC tells you whether a customer is worth acquiring; payback period tells you how long your cash is tied up before it comes back. Payback = CAC ÷ monthly gross profit per customer. A $200 CAC against $50/month of gross profit pays back in four months; the same CAC against $10/month takes twenty.
Payback matters most for subscription and repeat-purchase businesses, where revenue arrives over time. A long payback is survivable if you are well-capitalized and churn is low, but it magnifies the damage from any churn spike, because customers can leave before they have repaid their acquisition cost. Fast-growing companies watch payback as closely as the ratio, because it governs how much growth their cash can fund.
Suppose you spent $12,000 on ads and $3,000 on the salaries and tools behind them last month, and acquired 120 new customers. Fully-loaded CAC is (12,000 + 3,000) ÷ 120 = $125. If the average customer is worth $600 over their lifetime, LTV:CAC is 600 ÷ 125 = 4.8:1 — comfortably healthy, with room to push spend.
Strip out the $3,000 of salaries and tools and ad-only CAC looks like $100 — a 6:1 ratio. Both numbers are "true," but only the fully-loaded one should drive a decision to hire, raise budgets, or report unit economics to investors. Track both, and never compare your ad-only CAC to a competitor’s fully-loaded one.
The reflex when CAC rises is to cut spend, but that often just trades volume for a marginally better ratio. The durable levers are upstream: sharper audience targeting so more of the spend reaches likely buyers, better creative and landing pages so more clicks convert, and improved retention so each acquired customer is worth more, which raises the CAC you can afford.
Channel mix matters too. The cheapest first customers on any channel are the easiest to reach; as you scale, CAC on that channel climbs. Spreading budget across channels in proportion to their efficiency — and re-solving that split as performance shifts — keeps blended CAC lower than pouring everything into a single saturating channel.