What is a good LTV:CAC ratio?

Many SaaS and subscription benchmarks target around 3:1 or higher, meaning you earn about three dollars of lifetime gross profit for every dollar spent on acquisition. However, the right target depends on your business model, margin structure, and growth strategy.

Should I use revenue or gross profit for LTV?

Whenever possible, use gross profit (revenue minus variable costs) rather than raw revenue. Using revenue can significantly overstate LTV in businesses with meaningful cost of goods sold, leading you to overspend on acquisition.

How often should I update LTV?

Update LTV whenever churn, pricing, discounting, or expansion patterns change in a material way. Many teams recalculate or sanity-check LTV quarterly or semi-annually, especially during periods of rapid growth or product changes.

Can I use this ratio to compare different acquisition channels?

Yes. If you can estimate LTV for customers from each channel and calculate CAC per channel, you can compute LTV:CAC by channel. This helps you see where acquisition is most efficient and where you may need to improve targeting or messaging.

Is a very high LTV:CAC ratio always good?

Not necessarily. A very high ratio—say 7:1 or 8:1—can indicate that you are under-investing in growth. In competitive markets, it may be rational to accept a somewhat lower ratio if it allows you to capture market share while unit economics remain sound.

How does this relate to CAC payback period?

The LTV:CAC ratio tells you how much profit you expect over a customer’s entire life relative to acquisition cost, while CAC payback tells you how many months it takes to recover CAC from gross profit. Healthy businesses usually look at both metrics together.

Does this include overhead?

LTV is typically measured at the contribution-margin level, after variable costs but before overhead. Overhead and fixed costs are handled separately in your broader financial model, not inside this simple ratio.

Can I compare different segments?

Yes. Calculating LTV:CAC separately for segments (for example, geographies, industries, or company sizes) can reveal where your product is a particularly strong fit and where acquisition may not be economically viable.

finance calculator

LTV to CAC Ratio Calculator

Calculate LTV:CAC to see if customer lifetime value justifies acquisition cost.

Results

LTV:CAC ratio: 3.33

Overview

The LTV to CAC ratio is one of the cleanest ways to check whether your marketing and sales engine actually makes economic sense. It compares how much gross profit you expect to earn from an average customer over their life (LTV) to how much it costs to acquire that customer (CAC).

If you consistently spend more to win a customer than you earn back in gross profit, growth just burns cash. When the ratio is healthy, each acquired customer funds their own acquisition cost and leaves profit margin to cover overhead, product, and future growth.

Use this calculator to quickly translate your best estimates for LTV and CAC into an easy-to-interpret ratio so you can pressure-test channels, campaigns, and pricing assumptions before ramping spend.

How to use this calculator

Estimate your average customer lifetime value in terms of gross profit, not just revenue, and enter it in the LTV field.
Calculate your customer acquisition cost by including ad spend, sales and marketing payroll, commissions, agency fees, and other variable acquisition costs, then enter the average per customer.
Review the calculated LTV:CAC ratio shown by the calculator.
Compare the result to common benchmarks (for example, 3:1 or higher for many SaaS and subscription businesses).
Experiment with different scenarios—such as improving retention, raising prices, or lowering CAC—to see what it would take to hit your target ratio.
Use the insights to prioritize where to focus: acquisition efficiency, pricing, product stickiness, or expansion revenue.

Inputs explained

Customer lifetime value (LTV): Your best estimate of the average gross profit you earn from a customer over their full relationship with you. For many SaaS and subscription businesses, this is calculated as Average monthly gross profit per customer × Average customer lifespan in months.
Customer acquisition cost (CAC): The average all-in cost to acquire a single new customer. Include paid ads, sales and marketing salaries and commissions, agency fees, onboarding incentives, and other variable acquisition costs, divided by the number of new customers generated in the same period.

Outputs explained

LTV:CAC ratio: Shows how many dollars of lifetime gross profit you expect to earn for each dollar of acquisition cost. For example, a 3.5:1 ratio means you expect $3.50 of gross profit for every $1.00 spent on CAC.

How it works

You provide an estimated customer lifetime value (LTV), ideally measured as gross profit or contribution margin rather than top-line revenue.

You enter your customer acquisition cost (CAC), including all-in marketing and sales costs required to land a typical new customer.

The calculator divides LTV by CAC to produce the LTV:CAC ratio, showing how many dollars of profit you earn for each dollar spent acquiring a customer.

Ratios around 3:1 are a commonly-cited benchmark for healthy SaaS and subscription economics, while much lower ratios can signal unprofitable growth.

You can adjust either LTV (for example, by changing pricing, churn, or expansion assumptions) or CAC (by improving conversion or optimizing channels) and immediately see how the ratio responds.

Because the calculation is simple, the quality of your inputs matters far more than the math. The goal is to have a quick feedback loop for strategy rather than a perfectly precise forecast.

Formula

LTV:CAC ratio = LTV ÷ CAC

Where:
- LTV (lifetime value) is typically Gross profit per customer per period × Expected number of periods.
- CAC (customer acquisition cost) is Total acquisition spend over a period ÷ Number of new customers acquired in that period.

Example LTV calculation for a subscription business:
Let ARPU = Average monthly revenue per user
Let Gross margin % = (Revenue − Variable costs) ÷ Revenue
Let Churn rate = Monthly customer churn rate

Monthly gross profit per user = ARPU × Gross margin
Expected lifetime in months ≈ 1 ÷ Churn rate (for a simple steady-state assumption)
LTV ≈ Monthly gross profit per user × Expected lifetime in months

Once you have LTV, divide by CAC to get the LTV:CAC ratio.

When to use it

Checking whether your current LTV and CAC estimates support a sustainable growth plan before increasing marketing budgets.
Comparing acquisition channels by running separate LTV:CAC calculations for paid search, paid social, outbound sales, or partnerships.
Modeling how improved retention, higher ARPU, or better expansion sales could increase LTV and improve the ratio.
Helping founders and operators prepare for fundraising conversations by translating messy unit economics into a clear headline metric.
Stress-testing growth experiments where CAC is likely to rise—such as entering a new market or ramping an expensive channel—to see what LTV you would need to justify them.

Tips & cautions

Base LTV on contribution margin (after variable costs) to avoid overstating profitability—revenue-only LTV can make weak unit economics look strong.
Pair this ratio with a CAC payback calculation; a high LTV:CAC with a very slow payback period can still create cash-flow stress.
Segment your customer base (for example, SMB vs. enterprise, self-serve vs. sales-led) and calculate LTV:CAC separately to spot which segments are truly efficient.
Update your LTV inputs regularly as churn, pricing, or expansion behavior changes; stale LTV numbers can mislead you into overspending on acquisition.
Be conservative with early-stage LTV estimates. Use shorter time horizons or lower assumed lifetimes until you have strong retention data.
Provides a single snapshot based on current LTV and CAC estimates; it does not model cohort curves, churn over time, or changing behavior as you scale.
Ignores cash timing, which is why CAC payback and cash runway analysis are critical complements to this ratio.
Assumes LTV and CAC are measured over the same customer segments and time periods; mixing segments or periods can distort the ratio.
Does not automatically account for fixed overhead, product development costs, or future changes to pricing and retention strategies.
Not a valuation metric by itself—investors and operators will also look at growth rate, margin, retention, and market dynamics.

Worked examples

High-efficiency SaaS: LTV $1,200 and CAC $300

A B2B SaaS company estimates that the average customer generates $80 in monthly gross profit and stays for 15 months, so LTV ≈ $80 × 15 = $1,200.
Their blended CAC—covering paid ads, sales, and marketing—is $300 per new customer.
LTV:CAC = 1,200 ÷ 300 = 4.0 : 1, which is comfortably above the common 3:1 benchmark.
This suggests they have room either to grow faster by spending more on acquisition or to accept some CAC increase while remaining profitable.

Borderline economics: LTV $600 and CAC $400

A consumer subscription app has an estimated LTV of $600 when measured on a gross-profit basis.
Their average CAC, after including paid social spend and promotional discounts, is $400.
LTV:CAC = 600 ÷ 400 = 1.5 : 1, which is low for a subscription business and leaves little room for overhead or mistakes.
The team might need to improve retention (raising LTV), refine targeting to lower CAC, or adjust pricing before scaling spend.

Segment comparison: Enterprise vs SMB

An analytics company calculates LTV:CAC separately for enterprise and SMB customers.
Enterprise customers have LTV of $25,000 and CAC of $5,000, giving a 5:1 ratio.
SMB customers have LTV of $1,000 and CAC of $400, giving a 2.5:1 ratio.
Even if the SMB segment grows faster, the enterprise segment has stronger unit economics, which can influence sales focus and product roadmap decisions.

Deep dive

Calculate your LTV to CAC ratio by entering customer lifetime value and acquisition cost to quickly check whether your growth engine has healthy unit economics.

Use this LTV:CAC calculator alongside CAC payback and retention metrics to evaluate marketing efficiency, pricing decisions, and where to focus growth efforts.

FAQs

What is a good LTV:CAC ratio?: Many SaaS and subscription benchmarks target around 3:1 or higher, meaning you earn about three dollars of lifetime gross profit for every dollar spent on acquisition. However, the right target depends on your business model, margin structure, and growth strategy.
Should I use revenue or gross profit for LTV?: Whenever possible, use gross profit (revenue minus variable costs) rather than raw revenue. Using revenue can significantly overstate LTV in businesses with meaningful cost of goods sold, leading you to overspend on acquisition.
How often should I update LTV?: Update LTV whenever churn, pricing, discounting, or expansion patterns change in a material way. Many teams recalculate or sanity-check LTV quarterly or semi-annually, especially during periods of rapid growth or product changes.
Can I use this ratio to compare different acquisition channels?: Yes. If you can estimate LTV for customers from each channel and calculate CAC per channel, you can compute LTV:CAC by channel. This helps you see where acquisition is most efficient and where you may need to improve targeting or messaging.
Is a very high LTV:CAC ratio always good?: Not necessarily. A very high ratio—say 7:1 or 8:1—can indicate that you are under-investing in growth. In competitive markets, it may be rational to accept a somewhat lower ratio if it allows you to capture market share while unit economics remain sound.
How does this relate to CAC payback period?: The LTV:CAC ratio tells you how much profit you expect over a customer’s entire life relative to acquisition cost, while CAC payback tells you how many months it takes to recover CAC from gross profit. Healthy businesses usually look at both metrics together.
Does this include overhead?: LTV is typically measured at the contribution-margin level, after variable costs but before overhead. Overhead and fixed costs are handled separately in your broader financial model, not inside this simple ratio.
Can I compare different segments?: Yes. Calculating LTV:CAC separately for segments (for example, geographies, industries, or company sizes) can reveal where your product is a particularly strong fit and where acquisition may not be economically viable.

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This LTV to CAC ratio calculator is for educational and planning purposes only and relies on your own estimates for lifetime value and acquisition cost. It does not replace detailed financial modeling, cohort analysis, or advice from qualified finance professionals. Always validate your definitions of LTV and CAC with your finance and operations teams before making hiring, budgeting, or fundraising decisions based on these metrics.