Measure customer acquisition efficiency. Compute gross margin-adjusted LTV, LTV:CAC ratio, and CAC payback period in seconds.
Key insight: A healthy SaaS business targets an LTV:CAC ratio of 3:1 or higher — meaning each customer generates 3x their acquisition cost in lifetime value. Below 1:1 means you lose money on every customer. Above 5:1 may indicate under-investment in growth. This calculator uses gross margin-adjusted LTV (the industry standard), not simple revenue LTV.
Y-axis capped at 10 for readability. Actual ratio shown in labels.
| Metric | Formula | Industry Benchmark | Source | Test Conditions |
|---|---|---|---|---|
| Healthy LTV:CAC Ratio | LTV / CAC | 3:1 or higher | David Skok, OpenView 2024 | SaaS benchmark; <3:1 = inefficient acquisition, >5:1 = potential under-investment |
| Gross Margin-Adjusted LTV | (ARPU × Gross Margin) / Churn | Varies by industry | ProfitWell, ChartMogul 2024 | Monthly churn; use (1-(1-churn)^12) for annual churn |
| CAC Payback Period | CAC / (ARPU × Gross Margin) | < 12 months | OpenView SaaS Benchmarks 2024 | Under 6 months = excellent; 6-12 = good; >18 = risky |
| SaaS Median LTV:CAC | — | 3.0:1 | OpenView 2024 SaaS Survey | Median across 200+ SaaS companies; top quartile = 5.4:1 |
| E-commerce LTV:CAC | — | 2.5:1 - 3.5:1 | Shopify Plus, Corj 2024 | DTC brands; lower margins and higher churn than SaaS |
| Simple LTV (not recommended) | ARPU / Churn | Overstates by 20-67% | Industry consensus | Ignores cost of revenue. At 60% gross margin, simple LTV overstates by 67% (1/0.6 = 1.67x). Always use gross margin-adjusted LTV. |
Measure whether your acquisition engine is efficient. A ratio below 3:1 means you're spending too much to acquire customers relative to their lifetime value.
Justify marketing budget increases. If LTV:CAC is 4:1 or higher, you can likely spend more on acquisition without hurting unit economics.
Evaluate portfolio company health. LTV:CAC is one of the "4 SaaS metrics" investors check first, alongside churn, burn, and growth rate.
Determine if your paid acquisition is profitable. For e-commerce, target 2.5:1 to 3.5:1 due to lower margins and higher repeat purchase variability.
| Dimension | This Calculator | Excel | Paid Analytics (ChartMogul/ProfitWell) |
|---|---|---|---|
| Setup Time | 30 seconds | 30-60 minutes | 1-2 weeks integration |
| Gross Margin Adjustment | Yes | Manual formula | Yes (auto-synced) |
| Industry Benchmarks | 5 industries | None | Limited |
| Data Freshness | Manual input | Manual | Real-time |
| Cost | Free | Free (if you have Excel) | $100-$500/mo |
| Best For | Quick checks, pitches, planning | Custom models | Ongoing tracking |
For SaaS, 3:1 or higher is considered healthy. Below 1:1 means you lose money on every customer (acquisition cost exceeds lifetime value). Between 1:1 and 3:1 means you're profitable but inefficient — look for ways to reduce CAC or increase LTV. Above 5:1 may indicate you're under-investing in growth and could acquire more customers profitably.
Simple LTV (ARPU / churn) overstates value because it doesn't account for the cost of delivering your product. If your gross margin is 70%, only 70% of each dollar of revenue is actually profit you can use to recover acquisition costs. Using simple LTV can make a 2:1 ratio look like 3:1, leading to bad investment decisions. All reputable VC and SaaS frameworks (David Skok, OpenView, ProfitWell) use gross margin-adjusted LTV.
LTV:CAC measures total lifetime value relative to acquisition cost — it tells you if a customer is profitable over their entire lifetime. CAC payback measures how quickly you recover the acquisition cost — it tells you how long your cash is tied up. A company could have a healthy 4:1 LTV:CAC but a risky 24-month payback if churn is very low but ARPU is small. Both metrics matter: LTV:CAC for profitability, payback for cash efficiency.
Yes. CAC should include ALL costs associated with acquiring a customer: ad spend, content production, SEO tools, sales team salaries, commissions, and even a portion of overhead. Many companies exclude sales salaries and report artificially low CAC. When comparing to industry benchmarks (which typically include sales costs), make sure your CAC definition matches.
It might be. A very high ratio often means you're under-investing in growth. If you can acquire additional customers at the same CAC (or slightly higher), you should increase spending until the ratio approaches 3:1. The exception is if you're capital-constrained or if additional customers would strain your infrastructure. Use the ratio as a signal, not a rigid target.
Churn is the most powerful lever in the LTV:CAC formula. Reducing churn from 5% to 3% increases LTV by 67% (from 20x ARPU to 33x ARPU), which directly improves the ratio by 67%. In contrast, reducing CAC by 67% is much harder. This is why churn reduction often has higher ROI than CAC optimization for established businesses.
ROAS (Return on Ad Spend) measures only advertising efficiency: revenue from ads / ad spend. It doesn't account for product costs, sales salaries, or customer lifetime. LTV:CAC is a broader business metric that includes all acquisition costs and full customer lifetime value. A campaign can have a positive ROAS (4:1) but a negative LTV:CAC if gross margins are low or churn is high. Use our ROAS Calculator for campaign-level analysis.
No. All calculations run locally in your browser. Your ARPU, churn, CAC, and gross margin numbers are never sent to our servers or any third party. Page visit analytics (anonymous, no input data) may be collected by Cloudflare.
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