What is the target LTV:CAC ratio?

The benchmark for healthy SaaS is LTV:CAC ≥ 3:1. Below 3:1 means you're spending too much relative to customer value. Above 5:1 may indicate under-investment in growth — you could spend more on acquisition and still be profitable.

What should be included in CAC?

Include all sales and marketing spend: advertising, salesperson salaries (prorated), sales tools (CRM, prospecting), marketing tools, events, content production, and agency fees. Exclude post-sale customer success costs.

What is blended vs paid CAC?

Blended CAC includes all customer acquisition (organic + paid). Paid CAC includes only customers from paid channels. Blended is lower because it includes free/organic growth. Track both to understand channel efficiency.

Lower CAC by investing in content/SEO (lower marginal cost per customer), improving conversion rates (more customers from same spend), building referral programs, and improving sales efficiency (fewer touchpoints to close).

What is CAC payback period?

CAC payback period = CAC / (ARPU × Gross Margin). It measures how many months of customer revenue are needed to recover what you spent to acquire them. Under 12 months is strong for SaaS; 12–18 months is acceptable; over 24 months is a cash-flow warning.

How is CAC calculated?

CAC equals total sales and marketing cost for a period divided by the number of new customers acquired in that period. Include salaries, ad spend, software, and events in the cost figure for an accurate result.

Is my data sent to a server?

No. All CAC calculations run locally in your browser. Sales spend, customer counts, and LTV figures are never transmitted to any server or stored. You can use the calculator offline once the page has loaded.

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Free CAC Calculator — Customer Acquisition Cost & LTV:CAC Ratio

Customer Acquisition Cost (CAC) is the total sales and marketing spend divided by the number of new customers acquired in the same period. CAC is one of the most important unit economics metrics for SaaS businesses — benchmarked against LTV (LTV:CAC should be 3:1+) and tracked as a payback period.

Free — No SignupRuns in BrowserData Never Uploaded

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Calculate CAC from sales and marketing spend and benchmark against LTV.

Customer acquisition cost from sales and marketing spend
LTV:CAC ratio with a health verdict
CAC payback period in months
Benchmark comparison
Works with any currency
Client-side only — nothing is uploaded

Features

Everything you need in one Customer Acquisition Cost Calculator

Customer acquisition cost

Divides total sales and marketing spend by new customers to give CAC — the headline efficiency metric for any growth engine.

LTV:CAC ratio with a verdict

Compares lifetime value to CAC and flags whether the ratio is healthy, thin, or losing money against the 3:1 benchmark.

CAC payback period

Shows how many months of gross profit it takes to recover CAC — the cash-flow side of acquisition efficiency.

Benchmark context

Puts your numbers next to widely used SaaS benchmarks so you know whether to scale spend or fix the funnel first.

How It Works

How to use Customer Acquisition Cost Calculator

Enter S&M spend

Input total monthly sales and marketing spend (salaries, ads, tools, events).

Enter new customers

Enter the number of new customers acquired in the same period.

See CAC and ratios

View CAC, LTV:CAC ratio (enter LTV), payback period, and benchmark comparison.

Format Comparison

LTV:CAC ratio benchmarks — what each range means

LTV:CAC Ratio	Interpretation	Recommended action
< 1:1	Losing money on every customer	Pause paid acquisition; fix retention or pricing first
1:1 – 3:1	Below healthy threshold	Optimise conversion rates, increase average contract value
3:1 – 5:1	Healthy — SaaS target range	Maintain spend mix, test new acquisition channels
5:1 – 8:1	Efficient but may signal under-investment	Consider increasing acquisition budget to accelerate growth
> 8:1	Very efficient or niche market	Aggressively invest in growth; you have room to spend more

Troubleshooting

How to fix common syntax errors

Most “invalid JSON” failures come from a small set of mistakes. Paste the failing JSON above, click Validate, and the tool points you at the exact line and column.

Mixing time periods — monthly spend vs quarterly customersSpend: $90K (3 months) / New customers: 45 (1 month)

Match the period exactly. Use quarterly spend vs quarterly new customers, or monthly vs monthly.

Including post-sale costs in CACCAC includes customer success salaries and onboarding costs

CAC covers only pre-sale costs (ads, sales reps, tools). Post-sale costs belong in Cost to Serve, not CAC.

Comparing blended CAC against paid-only benchmarksBlended CAC = $400, benchmark $200 — concluding CAC is 2× high

Compare like for like. Blended CAC is always lower than paid-only CAC because it includes organic customers.

Using gross revenue LTV for LTV:CACLTV = ARPU × Lifespan without subtracting COGS

Use gross margin LTV: (ARPU × Gross Margin %) × Customer Lifespan. High-COGS products have lower effective LTV.

Not accounting for sales ramp timeNew AE hired in January counted as productive from month 1

New sales hires take 3–6 months to ramp. Apportion their salary to future customer cohorts, not current-month acquisitions.

Calculating CAC per lead instead of per closed customerCAC = $50K spend / 2,000 leads = $25 per lead

CAC denominator is new paying customers, not leads. $50K / 50 new customers = $1,000 CAC.

FAQ

Frequently asked questions

Customer Acquisition Cost (CAC) = Total Sales & Marketing Spend / New Customers Acquired. If you spend $50,000 in a month and acquire 25 customers, CAC = $2,000. It measures the efficiency of your growth engine.

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References

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