CAC & LTV Calculator
CAC (customer acquisition cost) is what you spend to win one customer; LTV (lifetime value) is the gross profit that customer generates over their lifetime. The LTV:CAC ratio compares the two and is the core measure of whether growth is sustainable. A widely used benchmark is a 3:1 ratio, with CAC ideally recovered within twelve months.
Calculate your cac & ltv calculator
Your numbers
Your unit economics
Healthy — a 3:1 LTV:CAC and under-12-month payback are common health benchmarks.
Lower CAC with GigdeSimplified model. LTV can also be estimated as ARPA × margin ÷ churn rate.
The formula
CAC = (Sales + Marketing spend) ÷ New customers. LTV = ARPA × Gross margin × Average lifespan. LTV:CAC = LTV ÷ CAC. CAC payback (months) = CAC ÷ (ARPA × Gross margin).
CAC and LTV together tell you whether your growth engine builds value or burns cash. CAC is total sales and marketing cost divided by the new customers it produced. LTV is the average revenue per account multiplied by your gross margin and the average number of months a customer stays. Dividing LTV by CAC gives the ratio that investors and operators watch most closely, because it shows how many dollars of lifetime profit each acquisition dollar returns.
A 3:1 LTV:CAC ratio is the common health benchmark — below 1:1 you lose money on every customer, while a very high ratio (say 5:1+) can signal you are under-investing in growth and could spend more to grow faster. CAC payback period, the months it takes to earn back acquisition cost, matters just as much for cash flow, with under twelve months considered healthy for most subscription businesses. Gigde optimizes programs for payback and LTV:CAC, not just lead volume.
Want the number moved for you? Gigde runs lead generation as a done-for-you service tied to revenue, not vanity metrics. Get a free growth plan →
What each input means
Accurate inputs are what make the cac & ltv calculator useful — garbage in, garbage out. Here is exactly what to enter for each field, and why it matters.
- Sales + marketing spend
- All fully-loaded cost of winning customers in the period — media, salaries, tools, agency fees, and content — not just ad spend. Under-counting this understates CAC and flatters your unit economics.
- New customers
- The customers actually acquired in that same period. Keep the numerator and denominator aligned to the same window; mixing a quarter's spend with a month's customers produces a meaningless CAC.
- ARPA & gross margin
- Average revenue per account and the margin on it. LTV uses gross-profit-adjusted revenue, not top-line revenue, because a dollar of revenue at a 30% margin is worth far less over a lifetime than a dollar at 80%.
- Average lifespan
- How long, in months, a typical customer stays. For subscriptions this is roughly one divided by your monthly churn rate; getting it right matters because lifespan multiplies straight into lifetime value.
How to read your result
The LTV:CAC ratio is the headline, and it's read as a band, not a single pass/fail line. Below 1:1 you lose money on every customer and cannot scale your way out of it. Around 3:1 is the widely cited healthy zone. Well above that — say 5:1 or more — often signals under-investment: you could profitably spend more to acquire customers faster and are leaving growth on the table by being too conservative.
Read CAC payback alongside the ratio, because they measure different risks. LTV:CAC tells you whether the business model works over a customer's lifetime; payback period tells you how long your cash is tied up before an acquisition pays for itself. A great ratio with a long payback can still strain cash flow, especially for a bootstrapped or fast-scaling company, so healthy businesses watch both together.
Why unit economics decide whether growth is real
Revenue growth is easy to buy and easy to fake — spend enough on acquisition and any company can post a bigger top line for a while. Unit economics reveal whether that growth is actually building value or just converting investor cash into short-lived customers. When LTV comfortably exceeds CAC and payback is short, every new customer strengthens the business; when it doesn't, faster growth simply loses money faster.
This is why operators and investors treat LTV:CAC and payback as the first questions, not the last. A company can look impressive on revenue and headcount while quietly failing on unit economics, and the market eventually forces the correction. Getting these numbers right early lets you scale acquisition with confidence, because you know each additional dollar of spend returns more than a dollar of lifetime profit.
How to move the ratio
You improve LTV:CAC from both sides. On the LTV side: raise prices or ARPA, expand accounts through upsells and cross-sells, and — most powerfully — reduce churn, since a small drop in churn lengthens lifespan and compounds through the whole lifetime-value calculation. On the CAC side: improve conversion rates so the same spend yields more customers, shift budget toward the channels with the lowest fully-loaded acquisition cost, and shorten the sales cycle.
Payback period responds to the same levers but rewards front-loaded value especially. Onboarding that gets customers to value fast, annual billing that pulls a year of revenue forward, and expansion revenue early in the relationship all shorten payback and free up cash to reinvest in growth. Optimizing for payback and LTV:CAC together — rather than chasing raw lead volume — is what turns a marketing budget into a compounding growth engine.
Common mistakes to avoid
- Using revenue instead of gross profit for LTV. Lifetime value should be margin-adjusted; counting top-line revenue overstates LTV and can make a losing business look healthy.
- Under-loading CAC. If CAC only includes ad spend and ignores salaries, tools, and fees, it will look artificially low and every downstream ratio will lie.
- Guessing lifespan. Overestimating how long customers stay inflates LTV the most of any input; base lifespan on real churn data, not hope.
More free calculators
CAC & LTV Calculator FAQs
How do you calculate CAC and LTV?
CAC is your total sales and marketing spend divided by the number of new customers it acquired in the same period. LTV is your average revenue per account multiplied by gross margin and by the average customer lifespan in months. This calculator computes both, plus the LTV:CAC ratio and CAC payback period.
What is a good LTV:CAC ratio?
A 3:1 LTV:CAC ratio is the widely cited benchmark for a healthy business — you earn three dollars of lifetime gross profit for every dollar spent acquiring a customer. Below 1:1 is unprofitable; far above 3:1 can mean you are under-spending on growth and leaving expansion on the table.
What is CAC payback period?
CAC payback period is the number of months it takes to recover the cost of acquiring a customer from the gross profit they generate. It is CAC divided by monthly revenue per account times gross margin. Under twelve months is generally considered healthy, especially for subscription and SaaS businesses.
Should LTV be based on revenue or gross profit?
Gross profit. Lifetime value is meant to represent the profit a customer contributes over their lifespan, so you multiply average revenue per account by your gross margin before extending it across the customer's lifetime. Using top-line revenue inflates LTV and can make an unprofitable business appear healthy — always margin-adjust.
How do I reduce customer acquisition cost?
Attack the two drivers of CAC: cost and conversion. Improve landing-page and funnel conversion so the same spend yields more customers, shift budget from high-cost channels to lower-cost ones like organic search and referrals, shorten the sales cycle, and make sure your CAC includes all costs so you're optimizing the real number rather than a flattering one.
Get your free growth plan
Tell us your goal and we'll map the highest-leverage path to more qualified leads — SEO, GEO, content, paid, and influencer, under one team. No spam, ever.