CAC Calculator
Customer Acquisition Cost — what it really costs to win a customer.
Your numbers
CAC — cost per customer
₹10,000
Total spend
₹5.00 L
Customers
50
Spend per customer
₹10,000
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Definition
Customer acquisition cost (CAC) is everything you spend to win one paying customer — ads, agency fees, sales salaries and tools — divided by the customers actually acquired in that period. It is the number that decides whether growth is profitable or just expensive.
The formula
CAC = (Marketing spend + Sales cost) ÷ New customers acquired
The sales half is the one people omit. If a salesperson costing ₹60,000 a month spends half their time closing new business, ₹30,000 belongs in the numerator. Leave it out and CAC looks healthy while the business quietly loses money on every customer.
A worked example
A Noida B2B services firm, one quarter
- 1Ad spend across Google and Meta: ₹4,50,000.
- 2Agency retainer: ₹1,50,000. Marketing tools: ₹30,000.
- 3One salesperson at ₹75,000/month, spending roughly 60% of their time on new business: ₹1,35,000 for the quarter.
- 4Total acquisition cost: ₹7,65,000. New customers closed in the quarter: 51.
CAC is ₹15,000. If average first-year revenue per customer is ₹45,000 at a 40% margin, each customer returns ₹18,000 against a ₹15,000 cost — profitable, but only just, and with no room to raise bids.
How to move the number
Raise close rate before raising budget
CAC is CPL divided by close rate. Moving close rate from 15% to 20% cuts CAC by a quarter without spending a rupee more on ads — and follow-up speed is usually the cheapest way to get there.
Respond in minutes, not hours
Lead-response time is the single most under-managed input to CAC in Indian SMBs. Enquiries that get a reply within five minutes close at a far higher rate than those answered the next day, and the leads cost the same either way.
Let the channels that compound carry more weight
Paid CAC is flat — you pay the same for the ten-thousandth customer as the first. SEO, referrals and reviews have falling marginal cost. A blended CAC that improves year over year almost always means the owned channels are growing.
Judge CAC against value, not against zero
A rising CAC is not automatically bad. If you are acquiring larger customers who stay longer, a higher CAC with a better LTV ratio is a better business. Track the ratio, not the raw number.
Where people get this wrong
- Excluding salaries and agency fees, which is the difference between a CAC that looks fine and one that is real.
- Counting customers in the month they closed against spend in the same month, when the sales cycle is 60 days. Match the cohort to the spend that produced it.
- Blending paid and organic into one CAC and then using it to decide ad budgets — organic subsidises the average and hides an unprofitable channel.
- Optimising CAC down while churn rises. Cheap customers who leave in three months are not cheap.
CAC Calculator — questions we get
What is a good CAC to LTV ratio?
The convention is 1:3 — you earn three rupees of lifetime gross profit for every rupee spent acquiring the customer. Below 1:1 you are losing money on growth. Much above 1:5 usually means you are under-investing and leaving demand on the table rather than being efficient.
Should CAC include salaries?
Yes, the portion of sales and marketing salaries spent on acquiring new customers. Account management and support for existing customers should not be in there. If that split is hard to estimate precisely, an honest approximation beats leaving it out entirely.
How often should I calculate CAC?
Monthly for a trend, quarterly for decisions. Monthly numbers in a business with a long sales cycle are noisy enough to mislead — a single large deal can swing them. Look at the direction over three or four months rather than reacting to one.
Is a rising CAC always a problem?
No. It is a problem if LTV is flat or falling. If you have deliberately moved upmarket and are winning larger, longer-lived customers, CAC should rise. The question is always whether the ratio improved, not whether the cost went up.
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