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LTV:CAC Ratio Calculator

Marketing

Calculate your LTV:CAC ratio instantly. Enter Customer Lifetime Value and Customer Acquisition Cost to assess business health and payback period.

Reviewed by the thecalcu.com team Ā· Last updated July 1, 2026

Customer Lifetime Value (LTV)$5,000
$100$50,000
Customer Acquisition Cost (CAC)$1,000
$10$10,000
Monthly Revenue per Customer$150
$10$5,000
Gross Margin70%
1%100%

LTV:CAC Ratio

5:1Excellent
0Ɨ3Ɨ target6Ɨ+

Strong economics ā€” highly scalable growth potential.

Payback Period9.5 mo

Excellent

Net LTV$4.0k

after acquisition cost

LTV:CAC Benchmarks

Critical0ā€“1Ɨ
Low1ā€“3Ɨ
Healthy3ā€“5Ɨ
Excellent> 5Ɨ
1
LTV:CAC Ratio
$5,000 (LTV) Ć· $1,000 (CAC) = 5:1
2
Monthly Gross Profit per Customer
$150 Ɨ 70% = $105
3
CAC Payback Period
$1,000 Ć· $105/month = 9.5 months
4
Net LTV (after acquisition cost)
$5,000 āˆ’ $1,000 = $4,000

What is a LTV:CAC?

The LTV:CAC Ratio Calculator computes the relationship between Customer Lifetime Value (LTV) and Customer Acquisition Cost (CAC), the foundational unit economics metric for any subscription or recurring-revenue business. The ratio answers the most important question in growth finance: does acquiring a customer create more value than it costs? A 3:1 ratio means every rupee spent on acquisition generates three rupees in customer lifetime value; a ratio below 1:1 means acquisition is actively destroying value.

LTV:CAC ratio is the lens through which every growth investment decision should be evaluated. It determines how aggressively a business can scale paid acquisition, what pricing changes are worth pursuing, and whether the current retention rate is high enough to support the growth model. For Indian SaaS companies raising Series A or B funding, demonstrating LTV:CAC above 3:1 is often a prerequisite, investors use it to assess whether the business model is fundamentally sound before evaluating growth rate.

This calculator also derives two additional outputs that add important context: CAC Payback Period (how many months until the customer pays back their acquisition cost through gross profit) and Net LTV (the actual value retained per customer after subtracting acquisition cost). Together, these three metrics give a complete picture of acquisition economics.

For context on the inputs to this calculator, the Customer Lifetime Value Calculator computes LTV from monthly revenue, gross margin, and churn rate. The Churn Rate Calculator computes the churn rate that feeds into LTV. The Customer Retention Rate Calculator shows the same dynamic from the retention angle. Used together, these four calculators give a complete view of the SaaS unit economics chain from acquisition through retention.

Why Use an LTV:CAC Ratio Calculator?

The ratio itself is a simple division, LTV divided by CAC. But the contextual outputs (health benchmark, payback period, net LTV, and the progress bar showing where 3:1 and 6:1 benchmarks sit) require additional computation and formatting that manual calculation skips.

The payback period calculation is particularly non-obvious: it requires separately computing monthly gross profit from revenue and margin before dividing into CAC. Most teams report LTV:CAC in isolation without payback period, but a 4:1 ratio with a 36-month payback requires significantly different financing strategy than a 4:1 ratio with an 8-month payback.

Who Should Use This Calculator?

SaaS founders use LTV:CAC as the primary metric for evaluating whether their growth model is working. A ratio consistently above 3:1 with declining CAC payback period is a signal to accelerate acquisition investment; a ratio trending below 3:1 signals a need to address retention or acquisition efficiency before scaling.

Growth and marketing teams use LTV:CAC to set acquisition budget guardrails. If the target LTV:CAC floor is 3:1 and current LTV is ā‚¹60,000, the maximum acceptable CAC is ā‚¹20,000, this directly sets the maximum cost-per-acquisition target for paid channels.

Investors and CFOs use LTV:CAC to assess the scalability of the growth model. A business with 5:1 LTV:CAC and 10-month payback can fund growth efficiently; one with 2:1 LTV:CAC and 30-month payback will face cash flow challenges as it scales even if the ratio eventually improves.

B2B sales teams use CAC payback period to benchmark sales efficiency. If the payback period is shortening quarter-on-quarter as the sales motion matures (shorter sales cycles, better qualification), that is evidence of improving go-to-market efficiency independent of revenue growth.

What Insights Does the LTV:CAC Ratio Calculator Give You?

LTV:CAC Ratio, the primary output, is displayed prominently with a progress bar anchored at the 3:1 healthy and 6:1 excellent thresholds, and a health badge (Critical/Low/Healthy/Excellent) that immediately contextualises the number. The colour coding makes it instantly clear whether the business is above or below the growth investment threshold.

CAC Payback Period shows how many months it takes to recover the acquisition cost through gross profit. It is colour-coded: green under 12 months (excellent), amber to 24 months (acceptable), red beyond 24 months (slow). This metric matters independently of the LTV:CAC ratio, a high ratio with a very long payback means strong unit economics but high working capital requirements.

Net LTV is LTV minus CAC, the actual dollar or rupee value created per customer after paying for their acquisition. A positive Net LTV confirms acquisition creates value; a negative Net LTV (LTV < CAC) signals fundamental unit economics failure regardless of any other metric.

How to use this LTV:CAC calculator

  1. Enter Customer Lifetime Value (LTV), the total gross revenue expected from a customer over their entire relationship with the business. If you have not calculated this, use the CLV Calculator first, which derives LTV from monthly revenue, gross margin, and churn rate.

  2. Enter Customer Acquisition Cost (CAC), the average cost to acquire one new customer, including all sales and marketing spend allocated to acquisition. Divide total acquisition-related spend by new customers acquired in the same period.

  3. Enter Monthly Revenue per Customer, the average monthly recurring revenue (MRR) per customer. Used to compute the monthly gross profit figure for the payback period calculation.

  4. Enter Gross Margin (%), the percentage of revenue remaining after direct costs. For pure SaaS, this is typically 60ā€“85%. For businesses with significant fulfilment or onboarding costs, it may be lower.

  5. Read your results, LTV:CAC Ratio with health badge, CAC Payback Period with colour coding, and Net LTV with directional colouring (green for positive, red for negative).

Formula & Methodology

LTV:CAC Ratio = LTV Ć· CAC

Monthly Gross Profit per Customer = Monthly Revenue Ɨ Gross Margin (%)

CAC Payback Period (months) = CAC Ć· Monthly Gross Profit

Net LTV = LTV āˆ’ CAC

Worked example using realistic values:

An Indian B2B SaaS company:
- LTV: ā‚¹1,20,000 (from CLV calculator: ā‚¹8,000/month Ɨ 70% margin Ć· 4.2% monthly churn)
- CAC: ā‚¹30,000 (ā‚¹30 lakh marketing spend Ć· 100 new customers)
- Monthly Revenue per Customer: ā‚¹8,000
- Gross Margin: 70%

LTV:CAC Ratio = 1,20,000 Ć· 30,000 = 4:1, Healthy

Monthly Gross Profit = ā‚¹8,000 Ɨ 70% = ā‚¹5,600

CAC Payback Period = ā‚¹30,000 Ć· ā‚¹5,600 = 5.4 months, Excellent

Net LTV = ā‚¹1,20,000 āˆ’ ā‚¹30,000 = ā‚¹90,000

Assumptions:

- LTV input should be gross LTV (before subtracting CAC), not net LTV. This calculator shows net LTV as a derived output.
- CAC should reflect blended acquisition cost across all channels (paid, organic, sales), not just advertising spend. Blended CAC gives the most accurate picture of total acquisition economics.
- Payback period uses gross margin, not contribution margin. If there are significant variable costs beyond direct product costs (implementation, onboarding, support), adjust gross margin downward to reflect true per-customer economics.
- This calculator uses a simplified LTV model assuming constant revenue per customer and constant churn rate. Businesses with strong negative churn (net revenue retention >100% from expansion) will have higher effective LTV than the simplified formula suggests.

Frequently Asked Questions

The LTV:CAC ratio compares the total revenue a customer generates over their lifetime (Customer Lifetime Value) to the cost of acquiring that customer (Customer Acquisition Cost). An LTV:CAC ratio of 3:1 means the business earns ā‚¹3 (or $3) in customer value for every ā‚¹1 spent on acquisition. It is the fundamental unit economics test for any subscription or recurring-revenue business, a ratio below 1:1 means the business literally loses money on every customer acquired.
A ratio of 3:1 is the widely cited minimum benchmark for a healthy SaaS business, the '3Ɨ rule' used by most growth investors. Between 3:1 and 5:1 is considered healthy and scalable, as it leaves enough margin to fund growth and operations. Above 5:1 is excellent but can sometimes indicate underinvestment in acquisition, if the ratio is very high, it may mean the business could profitably spend more on marketing and grow faster. Below 1:1 is critical, the business is destroying value with every customer acquired.
LTV:CAC Ratio = Customer Lifetime Value (LTV) Ć· Customer Acquisition Cost (CAC). LTV is typically calculated as: Average Monthly Revenue per Customer Ɨ Gross Margin (%) Ć· Monthly Churn Rate. CAC is total sales and marketing spend in a period divided by new customers acquired in the same period. This calculator lets you input LTV and CAC directly, and also derives CAC Payback Period and Net LTV as additional decision-making outputs.
CAC payback period is the number of months it takes to recover the cost of acquiring a customer through gross profit from that customer. It is calculated as: CAC Ć· (Monthly Revenue per Customer Ɨ Gross Margin). A payback period under 12 months is considered excellent, the customer has paid back their acquisition cost within a year. Between 12ā€“24 months is acceptable for most SaaS businesses with strong retention. Above 24 months is risky, as it requires the business to maintain sufficient working capital to bridge the acquisition investment before customers become profitable.
LTV (Customer Lifetime Value) = Average Monthly Revenue per Customer Ɨ Gross Margin (%) Ɨ Average Customer Lifespan (months). Average Customer Lifespan = 1 Ć· Monthly Churn Rate. For example: ā‚¹5,000 monthly revenue, 75% gross margin, 3% monthly churn rate gives LTV = ā‚¹5,000 Ɨ 0.75 Ć· 0.03 = ā‚¹1,25,000. Use the [Customer Lifetime Value Calculator](/clv-calculator/) to compute LTV before entering it here, or the [Churn Rate Calculator](/churn-rate-calculator/) to compute the churn rate input for the CLV formula.
Customer Acquisition Cost (CAC) is the total cost of acquiring one new customer, including all sales and marketing spend, salaries, tools, and ad spend allocated to acquisition in a period. CAC = Total Sales & Marketing Spend Ć· New Customers Acquired. For example: if a company spent ā‚¹10 lakh on marketing in a quarter and acquired 100 new customers, CAC = ā‚¹10 lakh Ć· 100 = ā‚¹10,000 per customer. Exclude existing-customer revenue (upsells) and retention spend from the CAC numerator, only count acquisition-focused costs.
Net LTV (or gross profit from a customer after accounting for acquisition cost) = LTV āˆ’ CAC. It represents the actual value generated per customer after subtracting what it cost to win them. Net LTV should be positive for a sustainable business. If LTV is $5,000 and CAC is $1,500, Net LTV is $3,500, the business retains $3,500 in value per customer. This metric is useful for capacity planning and evaluating acquisition efficiency: a high LTV with high CAC may produce a lower Net LTV than a moderate LTV with very low CAC.
The LTV:CAC ratio is the clearest signal of whether a business's growth is creating or destroying value. A high-growth company with an LTV:CAC below 1:1 is paying to lose money faster, growth accelerates destruction. A business with LTV:CAC above 3:1 has mathematically proven that its acquisition engine creates durable value with each customer added. Investors also use CAC payback period alongside LTV:CAC: a 5:1 ratio with a 36-month payback period means the business needs significant working capital to finance growth, which affects the funding requirement.
Churn rate is the primary lever for LTV, reducing churn directly increases average customer lifespan, which multiplies LTV. A business with 5% monthly churn has a 20-month average customer lifespan; reducing churn to 2.5% doubles lifespan to 40 months and doubles LTV, which in turn doubles the LTV:CAC ratio with no change to CAC. This is why customer success investment is often more ROI-efficient than acquisition investment: one reduces churn (multiplying LTV), the other reduces CAC (dividing into the same LTV). Use the [Churn Rate Calculator](/churn-rate-calculator/) to model how churn reduction affects your LTV:CAC.
Indian B2B SaaS companies targeting global enterprise markets are typically held to the same 3:1 benchmark as global SaaS. Indian SaaS companies selling to domestic SME markets often need to operate at higher ratios (4:1 or above) to compensate for shorter average customer lifespans (due to higher churn) and smaller average contract values that make each customer less valuable relative to fixed acquisition costs. Indian SaaS focused on the MSMEs segment often achieves this through very low CAC via product-led growth or channel partnerships rather than outbound sales.
The LTV:CAC ratio determines the maximum sustainable customer acquisition spend per customer, which in turn limits how aggressively you can scale paid acquisition. If LTV:CAC is 5:1 and you are targeting 3:1 as your floor, you have room to increase marketing spend by up to 66% before hitting the minimum acceptable ratio. Conversely, if it is at 2.5:1, you need to either reduce CAC, increase LTV through churn reduction or expansion revenue, or both before aggressively scaling acquisition. The ratio is a growth governor, not just a health metric.
ROAS (Return on Ad Spend) measures revenue generated per rupee of advertising spend, typically over a short window (campaign period or first purchase). LTV:CAC is a lifetime measure that captures the full customer value over their entire relationship with the business, net of all acquisition costs including sales, not just advertising. ROAS is a channel-level metric useful for optimising ad campaigns; LTV:CAC is a business-level metric useful for evaluating overall growth model sustainability. A high ROAS campaign can still produce customers with poor LTV:CAC if those customers churn quickly.
Also known as
LTV CAC ratioLTV to CAClifetime value acquisition cost ratioLTV/CAC