Revenue Analytics tool
LTV to CAC Ratio Calculator
See how much each customer is worth compared to what you spend to win them, so you know whether your growth actually makes money.
LTV : CAC Calculator
Formula
Lifetime Value ÷ Customer Acquisition Cost
Take how much a customer is worth to you over their whole time with you, and divide it by what you spent to win them. A result of 3 or higher means each customer is worth well more than they cost.
What is an LTV to CAC Calculator?
An LTV to CAC calculator weighs how much a customer is worth against how much it costs to win them. It turns those two numbers into a single ratio that shows whether your growth pays off or loses money.
Lifetime Value (LTV)
What’s a customer worth?
This is the numerator of the formula, and it comes down to two things: how much a customer pays you, and how long they stay before leaving. Multiply those together, and you get their lifetime value. The more they spend, the longer they stick around.
Acquisition Cost (CAC)
What’s a customer cost?
This is the bottom of the formula: the average price of winning one new customer. Take everything you spent to bring customers in, like ads, tools, and your sales and marketing salaries, and divide it by the number of new customers you gained.
Benchmark of 3
What score is good?
The number to aim for is 3 - you get about $3 back for every $1 you spend to win a customer. At 3 or higher, you’re in good shape. Below 1, you lose money on every one. In between, you’re making money, just less than you could. And oddly, too high (5 or more) can mean you’re underspending and could grow faster.
LTV:CAC Ratio
What does it tell you?
This one number shows whether your growth pays for itself. A high ratio means each customer earns back more than they cost, so it makes sense to spend on winning more. A low ratio is a warning: you’re paying more for customers than they’re worth, and every push for growth loses you money.
From spending on growth to growing profits
Grow faster by making every customer worth more
The right way to lift this ratio is to raise LTV – keep customers longer and get them to grow with you. ProductBridge turns customer feedback into a clear roadmap and a live changelog, so customers stay longer and spend more.
How to Use LTV to CAC to Grow Your SaaS?
Your ratio tells you what to do next. At around 3 or higher, each customer is worth well more than they cost, so it’s safe to spend more on winning new ones. Near or below 1, you’re paying more than a customer is worth, so fix that first before spending more on growth.
A low ratio has just two causes: you’re spending too much to win customers, or your customers aren’t worth enough. If it’s the cost, find cheaper ways to reach the right people. If it’s the value, work on keeping customers longer and getting them to spend more. Once you know which side is the problem, you know where to focus.
How to Improve Your LTV to CAC Ratio
Raise the top of the formula first. Reducing churn, improving onboarding, and shipping the features customers actually request all extend lifetime value — and because existing customers cost nothing to re-acquire, every extra month they stay flows straight into the ratio. Expansion revenue from upgrades and add-ons compounds the effect.
Then attack acquisition cost. Shift budget toward the channels that bring customers who stay — measure the ratio per channel, not just overall — tighten your targeting, and lean on compounding channels like SEO, referrals, and word of mouth. Teams that review the ratio quarterly catch drift early, before growth spend turns unprofitable.
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LTV to CAC calculator FAQ
Answers to common questions about calculating your LTV to CAC ratio and using it to guide SaaS growth decisions.
What is a good LTV to CAC ratio?
A ratio of 3:1 or higher is considered healthy — each customer brings in at least three times what they cost to acquire. Below 1:1 you lose money on every customer you win, while a very high ratio (5:1 or more) can mean you’re underspending on growth and could expand faster.
How do you calculate the LTV to CAC ratio?
Divide customer lifetime value by customer acquisition cost. For example, if a customer is worth $2,400 over their lifetime and costs $800 to acquire, your ratio is $2,400 ÷ $800 = 3:1. For the most accurate result, use gross-margin-adjusted LTV rather than raw revenue.
Should you use revenue or profit to work out LTV?
Profit gives the real number. Revenue is everything a customer pays you; profit is what’s left after the cost of actually serving them, like hosting, support, or payment fees. If serving a customer takes 30% of what they pay, only 70% is really worth something. Using raw revenue makes your ratio look healthier, so most teams multiply LTV by their gross margin.
How do you estimate LTV when your company is new?
When you don’t have years of history, use your churn rate to work out how long customers stay. If you lose 5% of customers a month, the average customer sticks around about 20 months. Multiply that by their monthly payment, adjust for margin, and you’ve got a rough LTV. Treat it as an estimation and lean on the churn method rather than guessing.
Should you calculate one overall ratio or one per channel?
Do it per channel. You win customers in different ways, like ads, referrals, and SEO, and each one has its own cost and its own payoff. One overall number blends them together, so a channel that’s losing money can hide behind the ones doing well. Checking each channel on its own shows which ones truly pay off, so you know where to spend more.
How does the CAC payback period fit in?
The ratio tells you whether a customer is worth the cost, and the payback period tells you how fast you earn that cost back, usually measured in months. Two companies can both hit 3:1, but one recovers its spend in 6 months and the other in 20. Getting your money back within a year is healthy, faster for cheap, self-serve products, and slower is normal for big enterprise deals.
What are the limitations of the LTV:CAC ratio?
LTV is a prediction. It assumes how long customers stay and how much they spend, and those assumptions can be wrong.
It’s unreliable for new companies that don’t yet know their real customer lifespan.
The 3:1 benchmark is a guide, not a promise, and it shifts with your stage and business.
The number alone doesn’t tell you what to do. It’s most useful alongside payback period, churn and your growth rate.