Estimate customer lifetime value two ways — retail-style and subscription-style — and see your LTV:CAC ratio.
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| Method | Assumptions | LTV | LTV:CAC |
|---|
Benchmark: LTV:CAC ≥ 3 is generally considered healthy. A ratio below 1 means you're losing money per customer acquired.
The LTV calculator (customer lifetime value calculator) estimates how much total value a typical customer generates for your business — a number that underpins nearly every acquisition, pricing, and retention decision you'll make. Because different business models earn revenue differently, this calculator gives you two methods side by side: a retail/transactional model built around repeat purchases, and a subscription/SaaS model built around monthly revenue and churn rate. It's designed for founders, growth marketers, and finance teams who need to know how much a customer is really worth before deciding how much to spend acquiring one.
Unlike a single-formula LTV tool, this calculator runs both methods at once and, when you enter a Customer Acquisition Cost, converts the subscription result into an LTV:CAC ratio — the headline metric growth and finance teams use to judge whether acquisition spending is sustainable. Because customer lifetime value and CAC are two halves of the same unit-economics question, this tool pairs naturally with NeftCal's CAC calculator, which breaks acquisition cost down by channel.
This tool is useful for e-commerce and retail founders estimating repeat-purchase value, SaaS and subscription operators converting churn into a lifetime value figure, marketers setting a maximum acceptable cost per acquisition, finance teams building unit-economics slides for a board or investor deck, and anyone deciding how much of a marketing budget a channel or campaign can justify.
The retail method multiplies your average purchase value by how often a customer buys per year and by how many years they typically stay a customer — a simple, intuitive model for e-commerce and repeat-purchase businesses. The subscription method instead starts from monthly churn rate, converts it into an implied customer lifespan in months (1 ÷ churn rate), and multiplies that lifespan by monthly revenue and gross margin to get a profit-based LTV — the standard approach used by SaaS and subscription companies. If you enter a Customer Acquisition Cost, the calculator also computes your LTV:CAC ratio using the subscription LTV as the headline figure, since it's the industry-standard way growth and finance teams frame unit economics.
LTV sets the ceiling on how much you can profitably spend to acquire a customer. Without it, a CAC number is meaningless — $200 to acquire a customer is a disaster if LTV is $100, and a bargain if LTV is $2,000. Comparing both methods also reveals how sensitive your business is to churn: shaving even a percentage point off monthly churn can substantially raise implied lifespan and LTV, often more than any pricing change could. Tracking LTV over time also gives an early warning sign — a shrinking LTV often shows up in the numbers well before it shows up in overall revenue.
LTV estimates the total value a customer generates over their relationship with your business.
The subscription formula uses gross margin so LTV reflects actual profit contribution, not just top-line billings — a much more useful number for CAC comparisons.
Small changes in monthly churn create large swings in implied lifespan and LTV. Reducing churn is often the highest-leverage lever a subscription business has.
LTV in isolation doesn't tell you whether growth is profitable. Always read it against Customer Acquisition Cost as the LTV:CAC ratio.
From choosing a method to reading your LTV:CAC ratio in a few minutes
Use the retail/transactional inputs if you sell one-off or repeat purchases, and the subscription/SaaS inputs if you run a recurring-revenue business. You can fill in both to compare.
Input average purchase value, purchase frequency per year, and average customer lifespan in years.
Input average monthly revenue per customer, gross margin percentage, and monthly churn rate — the calculator converts churn into an implied customer lifespan in months.
Add your CAC to unlock the LTV:CAC ratio, the headline metric for judging whether growth spending is sustainable.
Review the retail LTV, subscription LTV, LTV:CAC ratio, and implied customer lifespan side by side in the results and method comparison table.
Compare your ratio against benchmark bands — under 1:1 signals a loss, 3:1 or higher is generally considered healthy, and much above 5:1 may signal under-investment in growth.
A realistic side-by-side LTV calculation, step by step
Suppose a subscription business charges customers $50 per month on average, at a 75% gross margin, and loses 4% of customers per month (churn). The same business also runs a retail add-on line where the average purchase is $60, bought 4 times a year, with customers staying an average of 3 years. Customer Acquisition Cost is $150.
Explanation: A 4% monthly churn rate implies the average subscriber sticks around for 25 months (1 ÷ 0.04). Multiplying that lifespan by $50 in monthly revenue at 75% gross margin gives a subscription LTV of $937.50 — nearly $220 more than the $720 retail LTV from the same customer's occasional add-on purchases. Because CAC is $150 in both cases, the subscription line returns 6.25x its acquisition cost, versus 4.8x for the retail line — both comfortably above the commonly cited 3:1 healthy threshold.
Churn sensitivity check: if churn rose from 4% to 6%, implied lifespan would fall to 1 ÷ 0.06 ≈ 16.7 months, cutting subscription LTV to roughly $50 × 0.75 × 16.7 ≈ $626 and the LTV:CAC ratio to about 4.2x — still healthy, but a meaningfully smaller cushion from a two-point churn increase.
What your LTV:CAC ratio actually tells you
Once you know both LTV and Customer Acquisition Cost, the LTV:CAC ratio is the single most useful number for judging whether your growth spending is sustainable. These are general reference bands widely used in SaaS and growth circles, not a formal accounting standard.
| LTV:CAC Ratio | General Read | Typical Context |
|---|---|---|
| Below 1:1 | Losing money on every customer | Unsustainable — acquisition cost exceeds customer value |
| 1:1 – 3:1 | Marginal, worth investigating | Common in early-stage or high-competition channels |
| 3:1 – 5:1 | Healthy, sustainable unit economics | Widely cited target range for growth-stage businesses |
| Above 5:1 | Very strong, but check for under-investment | May indicate room to spend more on growth |
For a ratio below 1:1: you're spending more to acquire customers than they're worth. Revisit pricing, reduce acquisition spend on underperforming channels, or focus on retention before scaling further.
For a ratio around 3:1: this is the range most commonly cited as sustainable — it usually leaves enough margin to cover overhead, product development, and support costs beyond pure acquisition and delivery.
For a ratio well above 5:1: customer economics look excellent, but it can also mean you're being overly conservative with acquisition spend and leaving growth on the table — worth testing whether a larger budget still returns a healthy ratio.
Risk considerations: both LTV formulas assume constant churn, purchase behavior, and margins, and don't discount future revenue to present value. Treat the result as a planning estimate to stress-test against real cohort data, not a guarantee.
This calculator provides estimates for educational and informational purposes only. Results may vary depending on business conditions, accounting methods, taxes, market trends, and other factors. It should not be considered financial, legal, tax, accounting, or investment advice. Consult qualified professionals before making business decisions.
Where this LTV calculator earns its keep
Convert monthly churn into an implied customer lifespan and profit-based LTV.
Estimate lifetime value from repeat purchases using average order value and frequency.
Set a maximum acceptable Customer Acquisition Cost using the LTV:CAC ratio.
Quantify how much a churn-reduction initiative could be worth in additional LTV.
Show a concrete LTV:CAC ratio when presenting unit economics to investors.
Test how a price or margin change shifts subscription LTV before rolling it out.
Compare LTV:CAC across channels (paired with the CAC calculator) to reallocate spend.
Estimate the LTV lift from increased purchase frequency under a loyalty program.
Model how converting free users to paid subscribers changes blended LTV.
Track LTV and LTV:CAC ratio quarter over quarter as a unit-economics health check.
Blend retail-style purchase behavior with subscription-style churn dynamics.
Estimate client lifetime value before setting minimum retainer or contract terms.
What this LTV calculator does well, and where it can't replace a full cohort model
Quick-reference comparison of the three core unit-economics metrics
| Metric | What It Measures | Formula | Good Benchmark |
|---|---|---|---|
| LTV (Customer Lifetime Value) | Total value a customer generates over the relationship | Avg Purchase Value × Frequency × Lifespan, or Avg Monthly Revenue × Margin × Lifespan (months) | Higher relative to CAC |
| CAC (Customer Acquisition Cost) | Average cost to acquire one new customer | Total Sales & Marketing Spend ÷ New Customers — see the CAC calculator | Lower relative to LTV |
| LTV:CAC Ratio | Sustainability of acquisition spend versus customer value | LTV ÷ CAC | 3:1 or higher generally considered healthy |
Common questions about LTV calculations
Official guidance to complement this calculator — not a substitute for licensed financial advice
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