Every rupee spent on Instagram boosts, Google Ads, pamphlets, referral gifts and the salesperson's salary buys customers — the question is at what price each. Customer acquisition cost is that price: total sales and marketing spend in a period divided by the number of new customers won in it. Know it, and you know whether a ₹300 discount for first orders is generous or reckless, whether a campaign paid off, and how many orders a customer must place before you break even. This calculator computes CAC, blended and by channel, and compares it with customer value.
The formula
CAC = (Marketing spend + Sales spend) ÷ New customers acquired.
A boutique spent ₹45,000 on Meta ads, ₹12,000 on a designer, ₹8,000 on printed flyers and ₹30,000 of a salesperson's time in September and won 190 new customers → CAC = 95,000 ÷ 190 = ₹500. If a first order carries ₹420 of gross margin, the customer is not profitable until the second purchase — which is why retention is the other half of the calculation.
What to include in spend
| Include | Often forgotten |
|---|---|
| Ad spend (Meta, Google, marketplace ads) | GST on ad invoices if not claimed as ITC |
| Agency and freelancer fees, creative, photos | Discounts and free shipping for first orders |
| Salaries of sales and marketing staff (loaded — see employee cost) | Referral rewards paid out |
| Tools: CRM, WhatsApp API, design software | Trade-show stalls, samples, listing fees |
| Printed material, standees, signage | Time the owner spends selling |
Count new customers only — repeat buyers are the return on earlier CAC, not a new cost.
How to use the calculator
- Enter each spend item for the period (or just the totals) and the number of new customers.
- Optionally split by channel — Meta, Google, WhatsApp referrals, walk-in — to see CAC per channel.
- Enter average first-order margin and expected repeat purchases to see payback (orders to recover CAC) and the LTV:CAC ratio.
- Track monthly; a rising CAC with flat conversion usually means audience fatigue or price competition.
Benchmarks and the LTV:CAC rule
Small D2C brands in India see CAC of ₹300–1,500 on Meta depending on category; local services ₹100–800 per lead-turned-customer; B2B suppliers ₹2,000–20,000. The number itself matters less than the ratio: lifetime gross margin from a customer should be at least 3× CAC, and CAC should be recovered within a few purchases. If it is not, either raise retention, raise margin, or cut the channel.
Cutting CAC without cutting growth
- Referrals are the cheapest channel — measure them with the referral rate calculator and reward them modestly.
- Reviews lift conversion for free; the Google review request builder makes asking routine.
- Better conversion, same spend: fix the funnel with the lead conversion rate and marketing funnel tools before buying more traffic.
- WhatsApp over paid ads for repeat and reactivation — inbound chats are free; see WhatsApp Business per-message pricing.
- Local SEO: a complete Google Business Profile and schema markup bring customers at near-zero CAC — the 2026 checklist is in Google AI Mode and local search.
Related tools
- ROAS calculator — revenue per rupee of ad spend, the campaign-level view.
- Customer retention rate — the other half of LTV:CAC.
- Referral rate calculator — your cheapest acquisition channel.
- Lead conversion rate — convert more of the traffic you already pay for.
- Marketing funnel calculator — where prospects drop off.