CAC LTV Calculator
Calculate your Customer Acquisition Cost (CAC), Customer Lifetime Value (LTV), and LTV:CAC ratio instantly with our free CAC LTV calculator. Enter your marketing spend, customer count, purchase behaviour, and gross margin to get your unit economics in seconds — including CAC payback period and a health benchmark against the 3× industry standard. No signup required — all calculations run locally in your browser.
Enter your marketing spend and customer acquisition data to calculate CAC, then enter purchase behaviour and lifespan data to calculate LTV. The calculator instantly shows your LTV:CAC ratio, payback period, and a health assessment. All calculations run locally in your browser — your data never leaves your device.
All marketing & sales costs in the period
Number of new customers in the same period
Average revenue per transaction
Average purchases per customer per year
Average years a customer stays active
Leave 100% to use revenue-based LTV
- CAC = Total Marketing & Sales Spend ÷ New Customers Acquired
- LTV = Avg Purchase Value × Purchase Frequency × Customer Lifespan × Gross Margin %
- LTV:CAC Ratio = LTV ÷ CAC (target: 3× or higher)
- CAC Payback = CAC ÷ (Monthly Revenue per Customer × Gross Margin %)
Why Use Our CAC LTV Calculator?
Instant CAC & LTV Calculations
Calculate your Customer Acquisition Cost and Customer Lifetime Value instantly in your browser with zero wait time. Our CAC LTV calculator computes the LTV:CAC ratio, payback period, and health assessment in milliseconds — no server round-trips, no delays.
Secure CAC LTV Calculator Online
All CAC and LTV calculations happen locally in your browser — your business data and financial metrics never leave your device. Use our CAC LTV calculator online with complete privacy and zero data collection.
CAC LTV Calculator Online — No Installation
Use our CAC LTV calculator directly in any browser with no downloads, plugins, or app installs required. Calculate CAC, LTV, and LTV:CAC ratio from any device, anywhere — desktop, tablet, or mobile.
LTV:CAC Ratio Health Assessment
Our CAC LTV calculator automatically benchmarks your LTV:CAC ratio against industry standards (3× target) and provides actionable advice. Instantly see whether your unit economics are critical, below target, healthy, or excellent.
Common Use Cases for CAC LTV Calculator
SaaS & Subscription Business Analysis
SaaS founders use our CAC LTV calculator to evaluate whether their subscription model is financially sustainable. Calculate LTV from monthly recurring revenue, churn rate, and gross margin to determine if your CAC is justified.
Investor Pitch & Fundraising
Investors expect founders to know their LTV:CAC ratio before any funding conversation. Use our CAC LTV calculator to prepare accurate unit economics for your pitch deck and demonstrate a clear path to profitability.
Marketing Budget Optimisation
Use our CAC LTV calculator to evaluate the efficiency of each marketing channel. Compare CAC across paid search, social, and organic channels against LTV to allocate budget to the highest-ROI acquisition sources.
E-commerce & Retail Growth Planning
E-commerce businesses use the CAC LTV calculator to determine how much they can profitably spend to acquire a customer. Set maximum CAC thresholds based on LTV to keep paid acquisition campaigns profitable.
Product & Pricing Strategy
Use our CAC LTV calculator to model the impact of pricing changes on LTV. Increasing average order value or purchase frequency directly improves LTV and your LTV:CAC ratio without changing acquisition costs.
Customer Retention & Churn Analysis
Improving customer lifespan is the most powerful lever for LTV. Use our CAC LTV calculator to quantify the financial impact of reducing churn — even a 10% improvement in retention can dramatically increase LTV.
Understanding CAC and LTV
What is CAC and LTV?
CAC (Customer Acquisition Cost) is the total cost of acquiring one new customer, calculated by dividing all marketing and sales spend by the number of new customers acquired in the same period. LTV (Customer Lifetime Value) is the total revenue (or profit) a business can expect from a single customer over the entire duration of their relationship. Together, the LTV:CAC ratio is the single most important unit economics metric for any growth-stage business — it tells you whether your customer acquisition model is financially sustainable. The industry benchmark is a 3:1 LTV:CAC ratio, meaning every £1 spent acquiring a customer should generate £3 in lifetime value.
How Our CAC LTV Calculator Works
- 1. Enter Your CAC Inputs: Input your total marketing and sales spend for a period and the number of new customers acquired in that same period. The CAC LTV calculator divides spend by customers to give you your exact cost per acquisition. All processing happens locally in your browser — your data never leaves your device.
- 2. Enter Your LTV Inputs: Input your average purchase value, how many times a customer buys per year, how many years they stay active, and your gross margin percentage. The calculator applies the standard LTV formula to compute lifetime value. Set gross margin to 100% if you want revenue-based LTV rather than profit-based LTV.
- 3. Get Instant Results: Click Calculate CAC & LTV to see your CAC, LTV, LTV:CAC ratio, and CAC payback period with a full breakdown, visual comparison bar, and benchmark health assessment.
Key Metrics Explained
- CAC Formula: CAC = Total Marketing & Sales Spend ÷ New Customers Acquired. Include all costs: ad spend, agency fees, sales team salaries, tools, and events.
- LTV Formula: LTV = Average Purchase Value × Purchase Frequency (per year) × Customer Lifespan (years) × Gross Margin %. This gives profit-based LTV. For revenue-based LTV, set gross margin to 100%.
- CAC Payback Period: The number of months required to recover the cost of acquiring a customer from their gross profit contribution. Formula: CAC ÷ (Monthly Revenue per Customer × Gross Margin %). A payback period under 12 months is generally considered healthy for SaaS businesses.
- LTV:CAC Ratio Benchmarks: Below 1× means you lose money on every customer. 1–3× is unsustainable long-term. 3–5× is the healthy target range. Above 5× indicates excellent unit economics and signals you may be under-investing in acquisition.
How to Improve Your LTV:CAC Ratio
There are two levers: reduce CAC or increase LTV. To reduce CAC, focus on improving conversion rates, investing in organic channels (SEO, content, referral), and cutting underperforming paid campaigns. To increase LTV, focus on reducing churn (improving customer lifespan), increasing average order value through upsells and cross-sells, increasing purchase frequency through loyalty programmes and re-engagement campaigns, and improving gross margins through pricing or cost optimisation. Even a 20% improvement in customer lifespan can increase LTV by 20% without any change to acquisition costs.
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Frequently Asked Questions About CAC LTV Calculator
What is a CAC LTV calculator?
A CAC LTV calculator computes your Customer Acquisition Cost (CAC), Customer Lifetime Value (LTV), and the LTV:CAC ratio from your marketing spend, customer count, and purchase behaviour data. Our CAC LTV calculator also shows your CAC payback period and benchmarks your ratio against industry standards — all running locally in your browser.
What is a good LTV:CAC ratio?
The industry benchmark for a healthy LTV:CAC ratio is 3:1 or higher — meaning every £1 spent acquiring a customer should generate at least £3 in lifetime value. A ratio below 1× means you are losing money on every customer. A ratio above 5× is excellent and may indicate you are under-investing in growth. Our CAC LTV calculator automatically assesses your ratio against these benchmarks.
What costs should I include in CAC?
CAC should include all marketing and sales costs: paid advertising spend (Google, Meta, LinkedIn), agency and freelancer fees, sales team salaries and commissions, marketing tools and software, event and sponsorship costs, and content production costs. Divide the total by the number of new customers acquired in the same period.
What is the difference between revenue-based LTV and profit-based LTV?
Revenue-based LTV uses gross margin of 100% — it measures total revenue from a customer over their lifetime. Profit-based LTV multiplies by your actual gross margin percentage to show the profit contribution. Profit-based LTV is more accurate for comparing against CAC, since CAC is a cost. Set gross margin to 100% in our CAC LTV calculator if you want revenue-based LTV.
How do I calculate customer lifespan?
Customer lifespan is the average number of years a customer remains active. For subscription businesses, it is 1 ÷ monthly churn rate × 12. For example, a 5% monthly churn rate gives a lifespan of 1 ÷ 0.05 = 20 months ≈ 1.67 years. For transactional businesses, analyse your cohort data to find the average time between first and last purchase.
What is CAC payback period and why does it matter?
CAC payback period is the number of months it takes to recover the cost of acquiring a customer from their gross profit contribution. A shorter payback period means faster cash flow recovery and lower risk. For SaaS businesses, under 12 months is generally healthy. For e-commerce, under 6 months is common. Our CAC LTV calculator computes payback period automatically.
Is this CAC LTV calculator free to use?
Yes! Our CAC LTV calculator is 100% free with no signup, no ads, and no usage limits. Calculate CAC, LTV, and LTV:CAC ratio as many times as you need — completely free, forever.
Is my business data safe when using this CAC LTV calculator?
Absolutely. All CAC and LTV calculations happen locally in your browser using JavaScript. Your marketing spend, customer data, and financial metrics are never sent to any server, ensuring complete privacy every time you use our CAC LTV calculator online.
Can I use this calculator for SaaS, e-commerce, and other business models?
Yes. Our CAC LTV calculator works for any business model. For SaaS, use monthly recurring revenue as average purchase value and set purchase frequency to 12 (monthly billing). For e-commerce, use average order value and actual purchase frequency. For services businesses, use average project value and repeat engagement rate. The gross margin field lets you adjust for your specific cost structure.