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Unit Economics for Startups: CAC, LTV, Burn, and What Founders Should Track

Unit Economics for Startups: CAC, LTV, Burn, and What Founders Should Track

Unit economics for a startup are the revenues and costs tied to a single unit of your business, usually one customer. They tell you whether the business makes or loses money each time it acquires a customer, before growth hides the answer. The core figures are CAC, the cost to acquire a customer, LTV, the value that customer generates over their lifetime, and burn, the rate at which you spend cash. Read together, they reveal whether scaling will build a business or accelerate its collapse.

Founders often chase growth without knowing their unit economics, and growth on broken economics simply loses money faster. A company that spends more to win a customer than that customer ever returns does not fix the problem by acquiring more of them. This guide breaks down each metric, the ratios that matter, and what an early-stage founder should actually track.

What are unit economics?

Unit economics measure the direct revenue and cost associated with one unit of your business. For most startups the unit is a single customer, so unit economics answers a deceptively simple question. Does one customer make you money or cost you money?

The reason this matters is that aggregate revenue can look healthy while the underlying economics are broken. A startup can grow revenue every month and still be losing money on every customer, with each new sale deepening the hole. Unit economics strips that illusion away by looking at the single-customer level, where the truth is unavoidable.

For a founder, this is the difference between a business and a subsidised habit. Sound unit economics means growth compounds value. Broken ones mean growth compounds losses, and no amount of scale fixes a unit that loses money.

What is CAC and how do you calculate it?

Customer acquisition cost is the total amount you spend to acquire one new customer. You calculate it by dividing all sales and marketing spend over a period by the number of new customers won in that period. If you spent ₹5 lakh on sales and marketing in a month and gained 100 customers, your CAC is ₹5,000.

The honest version includes everything: ad spend, salaries of sales and marketing staff, tools, and content costs, not just the media budget. Founders who count only ad spend flatter their CAC and mislead themselves. A CAC that ignores the salary of the person running the campaigns is not a real number.

What is LTV and how do you calculate it?

Lifetime value is the total net revenue a customer generates across their entire relationship with you, minus the cost of serving them. A simple version multiplies average revenue per customer by the average customer lifespan, then subtracts service costs. The cleaner the retention, the higher the LTV, because customers who stay longer pay longer.

LTV is where retention and pricing quietly show up in the numbers. A product with strong retention and durable pricing power produces a high LTV almost automatically, which is one reason genuine product-market fit sits underneath healthy unit economics. Weak retention caps LTV no matter how much you charge.

What is a good LTV to CAC ratio?

The relationship between LTV and CAC is the single most revealing number in startup unit economics. It tells you whether each customer returns more than they cost to win.


Below 1:1: you lose money on every customer, and scaling makes it worse.

  • Around 1:1: you break even on acquisition with nothing left to fund the business.

  • Roughly 3:1: the widely cited healthy benchmark, where a customer returns about three times their acquisition cost.

  • Well above 3:1: often a sign you are underinvesting in growth and could acquire faster.

The 3:1 figure is a guideline, not a law, and it varies by model and stage. What matters is understanding where you sit and why, rather than treating any single number as a target to game.

What is burn and why does it matter?

Burn is the rate at which your startup spends cash beyond what it earns, usually measured per month. Net burn is the money leaving the business each month after revenue, and your runway is simply your cash balance divided by that burn. If you hold ₹1 crore and burn ₹10 lakh a month, you have ten months of runway.

Burn matters because it sets your deadline. Every month of runway is a month to prove the economics work before the money runs out. Burn is not inherently bad; spending to acquire customers who return more than they cost is healthy. Burn becomes dangerous only when it funds acquisition on broken unit economics, which is why founders track burn and the LTV to CAC ratio together rather than in isolation. Founders weighing outside capital to extend runway often look at the startup accelerators in India before facing investor diligence.

Which unit economics should early-stage founders track?

Early on, precision matters less than watching the right handful of numbers consistently. Pricing feeds several of them directly, so getting the fundamentals right, as covered in our guide on how to start a SaaS startup in India, is part of getting the economics right. Track these and you will see the health of the business clearly.

  • CAC: fully loaded acquisition cost, including salaries and tools.

  • LTV: net lifetime value after the cost to serve.

  • LTV to CAC: the ratio that shows whether customers pay back.

  • Payback period: how many months of revenue it takes to recover CAC.

  • Net burn and runway: monthly cash loss and how long it buys you.


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