Customer Acquisition Cost Calculator
Enter your marketing (and optional sales) spend and new customers to instantly get your CAC, CAC:LTV ratio, and payback period — free, no signup, calculated entirely in your browser.
Blended CAC uses total spend across all channels; if you only entered marketing spend, this is your paid CAC.
FORMULA
The CAC formula, explained
Customer Acquisition Cost answers one question: how much does it cost you, on average, to acquire one new paying customer? The formula is simple —
CAC = (Marketing spend + Sales spend) ÷ New customers acquired
Both numbers need to cover the same period — spend for the month divided by customers acquired that month, not a mismatched window. If you spent $5,000 on marketing and sales in a month and closed 50 new customers, your CAC is $100. That $100 only means something once you compare it to what a customer is worth — which is where the CAC:LTV ratio comes in.
RATIO
CAC:LTV ratio and why 3:1 is the benchmark
The CAC:LTV ratio compares what a customer costs to acquire against what they’re worth over their lifetime as a customer:
CAC:LTV ratio = Customer LTV ÷ CAC
- 3:1 or better — healthy. Each customer is worth at least three times what they cost to acquire, leaving room for overhead, margin, and reinvestment.
- Between 1:1 and 3:1 — marginal. You’re not losing money outright, but there’s little cushion once you account for delivery costs, churn, and overhead.
- Below 1:1 — losing money on every customer before other costs are even considered. Acquisition needs to get cheaper, retention needs to improve, or price needs to rise.
A very high ratio (10:1+) isn’t automatically a good sign either — it often means you’re under-spending on growth relative to how much headroom you have.
CHANNELS
Blended CAC vs. paid CAC
These two numbers get used interchangeably but answer different questions:
- Blended CAC divides total acquisition spend by all new customers — including ones who came from organic search, referrals, word of mouth, or any channel that didn’t cost you directly. It’s the real average cost per customer across the whole business, and it’s always equal to or lower than paid CAC.
- Paid CAC only counts spend on paid channels (ads, sponsorships, paid partnerships) divided by customers attributed specifically to those channels. It isolates whether a paid channel is working on its own, independent of your organic engine.
Use blended CAC to judge overall unit economics and whether the business model works. Use paid CAC, broken out per channel, to decide where to increase or cut ad spend. A business can have healthy blended CAC while one paid channel is quietly unprofitable — always look at both.
BENCHMARKS
What is a good CAC? Benchmarks by industry
CAC only means something relative to your price and LTV — a $200 CAC is great for a $2,000/year SaaS product and terrible for a $10 impulse purchase. These ranges are directional starting points, not targets:
| Industry | Typical CAC | Healthy CAC:LTV |
|---|---|---|
| SaaS (SMB) | $200 – $500 | 3:1 – 5:1 |
| SaaS (Enterprise) | $5,000 – $20,000+ | 3:1 – 4:1 |
| E-commerce (DTC) | $30 – $100 | 2:1 – 3:1 |
| Fintech / Financial services | $100 – $400 | 3:1 – 6:1 |
| Mobile apps (consumer) | $1 – $10 | 2:1 – 4:1 |
| B2B marketplaces | $500 – $2,000 | 3:1 – 5:1 |
LEVERS
How to reduce customer acquisition cost
- Fix the leakiest funnel step first. Improving conversion from visitor → signup → paid customer lowers CAC without spending an extra dollar on traffic — a landing page or checkout fix often beats a bigger ad budget.
- Grow organic and referral acquisition. Every customer who arrives through SEO, content, or word of mouth lowers your blended CAC because they cost nothing directly — invest here for a lower CAC that compounds over time.
- Improve targeting and creative, not just budget. A more specific audience and a message that matches real buyer intent raises conversion rate on the same spend — cutting paid CAC without cutting reach.
- Raise price or average order value. This doesn’t lower CAC, but it improves the CAC:LTV ratio directly — sometimes the fastest lever available.
- Invest in retention and expansion revenue. LTV is the other half of the ratio — reducing churn or growing upsell revenue raises LTV, which has the same effect on the ratio as lowering CAC.
- Cut underperforming channels. Compare paid CAC per channel — a channel with CAC well above your blended average is dragging the whole number up.
FAQ
Frequently asked questions
What is the CAC formula?
CAC (Customer Acquisition Cost) = total sales and marketing spend ÷ number of new customers acquired in the same period. If you spent $5,000 on marketing and sales in a month and acquired 50 new customers, your CAC is $100. That single number tells you how much it costs, on average, to turn a stranger into a paying customer.
What is a good CAC:LTV ratio?
The widely-used benchmark is 3:1 — a customer should be worth at least three times what it costs to acquire them. Below 3:1, you're spending too much relative to what customers return; above 5:1 can sometimes mean you're under-investing in growth and leaving acquisition budget on the table. A ratio at or below 1:1 means you lose money on every customer before accounting for any other costs.
What is a good CAC?
There's no universal "good" CAC — it only means something relative to your LTV, price, and margins. A $50 CAC is terrible for a $20 one-time product but excellent for a $2,000/year SaaS subscription. Judge your CAC against your own LTV (aim for 3:1 or better) and against your CAC payback period (ideally under 12 months for most subscription businesses), not against a number from a different industry.
What is the difference between blended CAC and paid CAC?
Blended CAC divides total spend (including organic, referral, and any channel that didn't cost you directly) by all new customers, including the free ones — it reflects your real average acquisition cost. Paid CAC only counts spend on paid channels (ads, paid partnerships) divided by customers attributed to those paid channels — it isolates whether your ad spend specifically is profitable. Blended CAC is usually lower and is the number that matters for overall unit economics; paid CAC is what you optimize channel-by-channel.
Should CAC include sales team salaries?
Yes, for a fully-loaded CAC. Marketing spend alone (ads, content, tools) gives you a marketing-only CAC, but a fully-loaded CAC adds sales salaries, commissions, and sales tooling — anything spent to convert a lead into a customer. Fully-loaded CAC is higher and more accurate for businesses with a sales team; marketing-only CAC is fine for self-serve products with no sales process.
How is CAC payback period calculated?
CAC payback period = CAC ÷ average monthly revenue (or gross margin) per customer. It tells you how many months it takes a new customer to "pay back" what it cost to acquire them. A payback period under 12 months is generally considered healthy for subscription businesses; under 6 months is excellent. Longer payback periods tie up more cash before a customer becomes profitable.
How do you reduce customer acquisition cost?
The highest-leverage levers are usually: improving conversion rate at every funnel step (so the same traffic yields more customers), increasing organic and referral acquisition (which lowers blended CAC without raising paid spend), improving ad targeting and creative to raise click and conversion quality, raising prices or average order value (which doesn't lower CAC directly but improves the ratio), and retention/expansion revenue (which raises LTV, the other half of the ratio). See the full breakdown below.
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