Customer Acquisition Cost Calculator
Most small businesses have no idea what a new customer actually costs them. If that number is higher than what the customer is worth, every sale digs the hole deeper. Six inputs, sixty seconds — here's your real math.
Ads, content, tools, freelancers — everything marketing.
Salaries, commissions, sales software. Yes, salaries count.
Paying customers gained — not leads, not followers.
Monthly revenue from a typical customer.
Revenue minus cost of goods. Services often run 70–90%.
How long a customer stays before churning.
What each number means
- CAC — customer acquisition cost. Total sales + marketing spend divided by new customers. This is the price tag on growth.
- LTV — lifetime value. Average monthly revenue × gross margin × lifespan. This is what a customer is actually worth to you.
- LTV:CAC ratio. The headline verdict. At 3:1 or better you're healthy; under 1:1 you're paying people to become your customers.
- Payback period. How many months of profit it takes to earn back what you spent acquiring the customer. Shorter is safer.
- Max CAC at 3:1. The most you could spend per customer and still hit the healthy 3:1 ratio. Your actual CAC should be at or under this.
The benchmarks (rules of thumb, honestly labeled)
Two numbers get cited across the startup and small-business world so often they've become standard:
- LTV:CAC of 3:1 or better — the widely cited healthy target. It leaves room for overhead, bad months, and growth spending.
- CAC payback under 12 months — the widely cited safety line. If it takes longer than a year to earn back an acquisition dollar, a churn spike can sink you.
These are industry rules of thumb, not laws of physics — capital-heavy or enterprise businesses legitimately run different numbers. Treat them as a starting point for judgment, not a grade.
Three levers when the math is tight
- Lower the CAC. Cheaper channels (referrals, content, partnerships) beat paid ads on cost. And converting more of the traffic you already get cuts CAC without spending a dollar more.
- Raise the LTV. Higher prices, upsells, and longer retention all push lifetime value up — which improves the ratio from the other side.
- Automate the expensive parts. Manual follow-up, quoting, and onboarding are labor costs hiding inside your CAC. That's exactly what AI systems replace.
CAC questions, answered
What is customer acquisition cost (CAC)?
Your total sales and marketing spend divided by the number of new customers acquired in the same period. Spend $3,000 in a month and gain 25 customers, and your CAC is $120.
What is a good LTV to CAC ratio?
The widely cited rule of thumb is 3:1 or better — lifetime value at least three times acquisition cost. Below 1:1 you're losing money on every customer; between 1:1 and 3:1 you're profitable but fragile.
Should employee salaries count in CAC?
Yes. The standard definition uses fully loaded sales and marketing cost: ad spend plus salaries, commissions, and sales/marketing software. Leaving salaries out is the most common way businesses understate their CAC.
How can I lower my customer acquisition cost?
Shift to cheaper channels (referrals, content, partnerships), convert more of your existing traffic, and automate manual sales labor. Raising lifetime value through pricing and retention improves the ratio from the other side.
How is CAC different from cost per lead?
Cost per lead measures what you pay for inquiries; CAC measures what you pay for actual paying customers. A cheap lead that never converts is expensive. CAC is the number that decides whether the business model works.