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LTV:CAC Ratio Calculator - Customer Lifetime Value | UK Creative Ventures
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LTV:CAC Ratio Calculator & Health Check

Calculate your Customer Lifetime Value, Customer Acquisition Cost and LTV:CAC ratio, then get an instant health score with actionable recommendations to improve your unit economics.

LTV + CAC + ratio Health score + diagnosis Free, no sign-up
Free marketing calculator · Used by SaaS, e-commerce and subscription businesses
UK Creative Ventures · LTV:CAC Health Check
£
Total revenue a customer generates over their lifetime. Use the LTV tab if you need to calculate this.
£
Total sales & marketing spend ÷ new customers acquired in the period.
%
Used to calculate margin-adjusted LTV
mo
How quickly you want to recover your acquisition cost
3.0×
Healthy
Your LTV:CAC ratio is above the 3:1 benchmark
CriticalAt riskHealthyExcellent
0×1×2×3×4×5×+
LTV:CAC ratio
3.0×
CAC payback (months)
—
Margin-adjusted LTV
£840

Calculate Customer Lifetime Value from your key business metrics. Choose between the simple formula or the more detailed churn-based calculation for subscription businesses.

£
×/yr
How many times a year an average customer buys
yrs
Or use churn rate below to calculate automatically
%/mo
Overrides lifespan - lifespan = 1 ÷ monthly churn
%
%
For DCF-adjusted LTV - typically 8-15% for UK businesses
Simple LTV
£1,200
Margin-adjusted LTV
£840
DCF-adjusted LTV
£756
💡 Copy your Simple LTV into the LTV:CAC Health Check tab to calculate your ratio and payback period. Use Margin-adjusted LTV for a more conservative and accurate view of profitability per customer.

See how small improvements to key metrics move your LTV:CAC ratio. Enter your current numbers then adjust the levers to model scenarios.

£
£
−20%0%+50%
0%25%−50%

What is LTV:CAC and why does it matter?

The LTV:CAC ratio compares the lifetime value of a customer to the cost of acquiring them. It is the single most important unit economics metric for any business that spends money on customer acquisition, whether that is a SaaS company, an e-commerce brand, a subscription service or a professional services firm.

A ratio of 3:1 is the widely cited benchmark for a healthy business, meaning you generate £3 of customer lifetime value for every £1 spent acquiring a customer. Below 1:1, you are losing money on every customer you acquire. Between 1:1 and 3:1, you are profitable but potentially underinvesting in growth or operating with thin margins.

How to calculate Customer Lifetime Value (LTV)

The simplest LTV formula is:

LTV = Average Order Value × Purchase Frequency × Customer Lifespan

Worked example: simple LTV E-commerce brand with:
Average order value: £80 · Purchases per year: 3 · Average customer lifespan: 4 years
LTV = £80 × 3 × 4 = £960

Margin-adjusted LTV (at 50% gross margin): £960 × 0.50 = £480

For subscription businesses with a known churn rate, the lifespan can be calculated as 1 ÷ monthly churn rate. A business with 5% monthly churn has an average customer lifespan of 20 months, or 1.67 years.

How to calculate Customer Acquisition Cost (CAC)

CAC is your total sales and marketing spend divided by the number of new customers acquired in the same period:

CAC = Total Sales & Marketing Spend ÷ New Customers Acquired

Include all costs: ad spend, agency fees, sales team salaries, marketing tools, content production and any other costs directly associated with acquiring customers. Many businesses underestimate CAC by only counting ad spend and forgetting staff and overhead costs.

LTV:CAC ratio benchmarks

LTV:CAC ratioHealth statusWhat it means
Below 1:1🔴 CriticalLosing money on every customer - unsustainable
1:1 - 2:1🟠 At riskBarely profitable - margins too thin to scale
2:1 - 3:1🟡 AcceptableProfitable but below the growth benchmark
3:1 - 5:1🟢 HealthyThe benchmark zone - sustainable growth possible
Above 5:1💚 ExcellentStrong unit economics - consider investing more in growth

CAC payback period

The CAC payback period is the number of months it takes to recover your customer acquisition cost from gross profit generated by that customer. It is calculated as:

CAC Payback = CAC ÷ (Monthly Revenue per Customer × Gross Margin)

For most SaaS businesses, a payback period under 12 months is considered healthy. For e-commerce, under 6 months is often the target. A longer payback period increases the cash flow burden on the business and the risk that customers churn before you have recovered your acquisition cost.

How to improve your LTV:CAC ratio

There are two levers: increase LTV or decrease CAC. The most sustainable improvements usually come from both simultaneously:

  • Increase LTV: Reduce churn through better onboarding and customer success; increase average order value through upsells and bundles; improve purchase frequency through email, loyalty programmes and re-engagement campaigns; raise prices where value justifies it.
  • Reduce CAC: Improve conversion rates on landing pages and in sales processes; invest in organic channels (SEO, content, referrals) that reduce paid acquisition dependency; optimise ad targeting to reach higher-intent audiences; improve lead qualification to reduce wasted sales effort.

Frequently asked questions about LTV:CAC

The widely accepted benchmark for a healthy LTV:CAC ratio is 3:1 - meaning you generate £3 of customer lifetime value for every £1 spent acquiring a customer. Below 1:1, you are losing money on every customer. Between 1:1 and 3:1 you are profitable but below the growth benchmark. Above 5:1 suggests strong unit economics, though if your ratio is very high it may indicate you are underinvesting in growth.
The simplest LTV formula is: Average Order Value × Purchase Frequency × Customer Lifespan. For example, if your average order value is £100, customers buy 4 times per year, and the average customer stays for 3 years, LTV = £100 × 4 × 3 = £1,200. For subscription businesses with a known churn rate, customer lifespan = 1 ÷ monthly churn rate. A 5% monthly churn rate means an average lifespan of 20 months.
CAC should include all costs associated with acquiring new customers: advertising spend (Google Ads, Meta, LinkedIn), agency and consultant fees, sales team salaries and commissions, marketing tools and software, content production costs, trade shows and events, and an allocated share of marketing management overhead. Many businesses underestimate CAC by only counting ad spend, a more accurate CAC includes all these costs divided by new customers acquired in the period.
CAC payback period is the number of months it takes to recover your customer acquisition cost from the gross profit generated by that customer. It matters because a longer payback period means more capital tied up before you see a return, and greater risk if customers churn before they've covered their acquisition cost. For SaaS businesses, under 12 months is typically healthy. For e-commerce, under 6 months is a common target.
Margin-adjusted LTV multiplies the simple LTV by your gross margin percentage, giving a more accurate picture of the actual profit generated by a customer rather than just the revenue. For example, if simple LTV is £1,200 and your gross margin is 60%, margin-adjusted LTV is £720. This is the more useful figure when comparing LTV against CAC, because CAC is already a cost, you want to know if the profit (not the revenue) exceeds the acquisition cost.
First, verify your inputs — many businesses overestimate LTV or underestimate CAC. If the ratio is genuinely below 3:1, focus on the levers with the biggest impact: reducing churn (even a small improvement dramatically increases LTV), improving conversion rates to lower CAC, and increasing average order value. Use the Improvement Simulator tab to model which changes would move your ratio above 3:1 fastest.
They are related but not the same. LTV:CAC is a unit economics metric that looks at the value of an individual customer relationship relative to the cost of acquiring it. ROI on marketing looks at the return on a specific campaign or budget in a defined period. LTV:CAC is a longer-term, strategic metric; marketing ROI is more tactical. Both are important, LTV:CAC tells you whether your business model is sustainable, while marketing ROI tells you which channels and campaigns are working.
For most businesses, a monthly or quarterly review is appropriate. Track changes in both LTV and CAC separately, if your ratio deteriorates, you need to know whether it was driven by rising acquisition costs, falling retention, or both. SaaS and subscription businesses should also track cohort-level LTV to understand whether the quality of customers you are acquiring is improving or declining over time.
In theory, yes. An LTV:CAC ratio above 5:1 or 6:1 can indicate that you are underinvesting in growth, you have strong unit economics but are not deploying enough capital into customer acquisition to capture market share. In competitive markets, a very high ratio can attract competitors who are willing to spend more aggressively. Many growth-stage investors actually want to see LTV:CAC in the 3–5× range rather than significantly higher, as it suggests balanced investment in growth.
Blended CAC divides total sales and marketing spend by all new customers, including those who came through organic channels like SEO, referrals, or word of mouth. Paid CAC only includes customers acquired through paid channels. Blended CAC gives a more conservative and accurate picture of your overall unit economics. Paid CAC is useful for evaluating the efficiency of your paid acquisition specifically. Tracking both helps you understand the contribution of organic versus paid acquisition to your overall growth efficiency.

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