Solutions · LTV:CAC Calculator

LTV:CAC ratio calculator with CAC payback period

The LTV:CAC ratio is the fastest read on whether your acquisition is building a business or burning cash. This calculator does the math live: enter your average revenue per customer, your gross margin, how long a customer stays, and what it costs you to win one, and it returns customer lifetime value in gross profit, your LTV to CAC ratio, and how many months it takes to pay that acquisition cost back.

The healthy benchmark most operators aim for is about 3:1, lifetime value worth roughly three times what you spend to acquire a customer. Below 1:1 you lose money on every sale; above 5:1 you are often under-investing and leaving growth on the table. Work out your own ratio below, then see how AdBot pushes it up by lowering CAC across Google, Meta, and TikTok every day.

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Last updated July 2026

LTV:CAC calculator

Live

Revenue per customer / mo ($)

Customer lifetime (months)

Gross profit margin

Customer acquisition cost, CAC ($)

Lifetime value

gross profit

LTV:CAC ratio

aim for 3:1+

CAC payback

months

Numbers stay in your browser. AdBot lowers CAC across Google, Meta, and TikTok so your ratio climbs.

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What you get

A full media buyer, working for you 24/7

Your real ratio, live

It computes lifetime value in gross profit, not revenue, so your LTV:CAC ratio reflects money you actually keep rather than a flattering top-line number.

Payback in months

It also returns your CAC payback period, the months of gross profit it takes to recoup what you spent to acquire a customer. Shorter payback means faster, safer scaling.

Then AdBot lifts it

A ratio only improves if CAC comes down. AdBot manages bids, budgets, and creative across three channels daily to acquire customers below your target cost.

What it handles

Everything, from research to daily optimization

You set the goal and the budget. AdBot does the work a media buyer would, and reports back in plain language.

Lifetime value from gross profit, not revenue
Your true LTV:CAC ratio, live
CAC payback period in months
Then lower CAC across three channels

14-day result

Optimizing

Cost per acquisition

$25

▼ 38%

Return on ad spend

3.6x

▲ 31%

Budget reallocated to winners

How do you calculate the LTV:CAC ratio?

The LTV:CAC ratio divides customer lifetime value by customer acquisition cost. Get lifetime value first, and use gross profit rather than revenue: multiply average revenue per customer per period by your gross margin, then by how many periods an average customer stays. A customer paying $120 a month at a 75 percent margin for 20 months is worth about $1,800 in gross profit. Divide that by a $500 CAC and your ratio is 3.6 to 1.

CAC is the fully loaded cost of winning a customer: ad spend plus the salaries, agency fees, software, and creative that go into acquisition, divided by the number of new customers in the same window. Leaving out anything but media spend flatters the ratio and hides the real number. For the full method and the mistakes that skew it, see how to calculate customer acquisition cost.

What is a good LTV:CAC ratio?

A good LTV:CAC ratio is around 3:1, meaning a customer is worth roughly three times what you pay to acquire them. That leaves enough gross profit to cover overhead, product, and margin after acquisition. A ratio below 1:1 means you lose money on every customer and should pause scaling until pricing, retention, or CAC improves.

A very high ratio is not automatically better. Once you clear 5:1, the constraint is usually that you are spending too little, not too smartly, and you could win customers faster by investing more even if the ratio settles back toward 3:1. The deeper read on each band lives in our guide to what a good LTV:CAC ratio is.

What is the CAC payback period?

CAC payback period is the number of months of gross profit it takes to earn back what you spent to acquire a customer. Divide CAC by the monthly gross profit a customer generates: a $500 CAC against $90 of monthly gross profit pays back in about 5.6 months. Shorter payback frees up cash to reinvest sooner and lowers the risk of scaling.

Most subscription businesses aim to recover CAC inside 12 months, and the best inside 6. Payback matters even when the LTV:CAC ratio looks fine, because a strong lifetime ratio with a long payback still ties up cash you need to grow. If you think in revenue multiples instead, run the same spend through our ROAS calculator, or set a hard acquisition ceiling with the CPA calculator.

How AdBot improves your LTV:CAC ratio

You raise an LTV:CAC ratio one of two ways: lift lifetime value or lower acquisition cost. Lifetime value is a product and retention job. Acquisition cost is a media job, and it is the lever that moves fastest. Getting CAC down means bidding to the customers who convert, cutting waste on the ones who do not, and moving budget to whatever channel is returning this week, every day, not once a quarter.

That daily work is what AdBot does. It builds and runs campaigns across Google Ads, Meta, and TikTok, holds spend to a CAC below your target, and shifts budget toward the winners automatically. Teams that want the same discipline as software rather than a hire compare the options on our AI PPC software page.

Why AdBot

Done-for-you, both channels, flat fee

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Build to launch in 48h

Research, creative, structure, and launch across Google and Meta, with no onboarding call.

Optimized every day

Bids, budgets, audiences, and creative tuned 24/7 to drive your CPA down and ROAS up.

No cut of your spend

A flat monthly fee, never a percentage of ad spend. Your budget stays yours.

Good questions

Questions about ltv:cac calculator

A good LTV:CAC ratio is about 3:1, where a customer is worth roughly three times what it costs to acquire them. Below 1:1 you lose money on every customer, and above 5:1 you are usually under-investing in growth and could afford to spend more to win customers faster.

Divide customer lifetime value by customer acquisition cost. Calculate lifetime value from gross profit: average revenue per customer times gross margin times how many periods they stay. Then divide by fully loaded CAC, which is all acquisition spend divided by new customers in the same period.

Most subscription businesses aim to recover customer acquisition cost within 12 months, and the strongest within 6. Payback period is CAC divided by the monthly gross profit a customer generates. Shorter payback frees cash to reinvest sooner and makes scaling less risky.

Use gross profit, not revenue. A revenue-based LTV overstates what a customer is actually worth because it ignores cost of goods, delivery, and support. Multiply revenue by gross margin first, so the LTV:CAC ratio reflects money you keep and can spend on growth.

Yes. A ratio above 5:1 usually signals under-spending rather than efficiency. If customers are worth far more than they cost to acquire, you can often grow faster by investing more in acquisition, accepting a lower ratio closer to 3:1 in exchange for capturing market share sooner.

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