CAC + Payback Calculator
Customer acquisition cost, LTV:CAC, and payback months
Calculate Customer Acquisition Cost, LTV:CAC ratio, and payback period in months. India-SMB presets for SaaS, D2C, services, edtech, fintech, and real estate.
What is a CAC + Payback?
Customer Acquisition Cost (CAC) is the total cost of acquiring one paying customer — ad spend, sales salaries, tooling, every rupee spent to land the deal. Payback is how many months of gross profit it takes to recover that CAC. Together they are the two numbers that decide whether your business compounds or burns out.
Most Indian SMB founders track Cost Per Lead (CPL) but never roll the funnel forward to CAC and payback. The result is a tempting CPL that hides a broken business — low close rate, thin margins, or short retention can each individually destroy unit economics that look fine at the top of the funnel.
This calculator takes ad spend + sales cost, leads, close rate, ARPU, gross margin, and retention to give you the four numbers that matter — CAC, LTV, LTV:CAC ratio, and payback months — plus a verdict tailored to Indian SMB benchmarks. Vertical presets prefill realistic close-rate, ARPU, and margin defaults so you can sanity-check your own numbers against the typical range.
Why use this CAC + Payback Calculator
Built for Indians, by Indians. Every number, every formula, every slab — tuned to FY 2026-27 reality.
7 India-SMB presets
SaaS-India, D2C, services/agency, edtech, fintech, real estate, custom — typical close-rate, ARPU, margin baked in.
Verdict + diagnosis
Traffic-light reading on payback with a specific reason (CPL, close rate, margin, retention).
Native INR
No USD conversions, no US-context benchmarks. Indian channel costs and SMB ARPU baked in.
Private
Calculations run in your browser. No signup, nothing stored.
Using the CAC + Payback Calculator in 4 steps
No onboarding, no signup. Answer three fields and the numbers update live.
Pick your vertical
Loads typical close-rate, ARPU, and gross margin for the vertical. Override any field below.
Enter monthly ad spend + sales cost
Total acquisition cost: paid-channel spend + SDR/sales salaries + tooling. Be honest — half the spend hidden in payroll is the most common modelling error.
Enter leads and close rate
Leads = MQLs from paid channels. Close rate = MQL → paying customer. The product gives you new customers per month.
Read CAC, LTV, payback, verdict
If payback > 12 months, the model is breaking. Fix the largest leak first — usually close rate or retention.
Tips to get the most out of it
Include sales salaries in CAC — not just ad spend. Excluding sales cost is the single biggest reason CAC numbers look better than reality.
Use cohort retention, not blended retention. A 24-month average across new and old cohorts overstates LTV when you are growing fast — newer cohorts have less time to churn out.
Track CAC and payback monthly. CAC drift is invisible week-to-week; you only see the trend on a 6-month chart. Build a Looker / Sheets dashboard once and stop eyeballing it.
For services with long retention, payback ≤ 6 months is exceptional and you should scale ad spend aggressively. For D2C, payback ≤ 3 months is the equivalent — D2C retention is much shorter.
LTV:CAC of 5x+ usually means you are under-investing in growth, not winning. Either pour more into top-of-funnel or expand into a higher-CAC adjacent segment.
Real-world scenarios
How Indians actually use this calculator — concrete numbers, concrete plans.
India SMB SaaS, ₹5 L/mo ad spend
200 leads × 15% close = 30 customers. CAC = ₹5.5 L / 30 ≈ ₹18,333. ARPU ₹2,500 × 80% margin = ₹2,000/mo profit. Payback ≈ 9 mo. LTV (18 mo retention) = ₹36,000. LTV:CAC ≈ 2x — under healthy threshold; either raise close rate or annual prepay to push LTV:CAC above 3x.
D2C apparel brand, ₹10 L/mo ad spend
5,000 leads × 2.5% close = 125 customers. CAC = ₹10.5 L / 125 = ₹8,400. ARPU ₹1,500 × 35% margin = ₹525/mo. With retention 8 mo, LTV = ₹4,200. LTV:CAC = 0.5x. Broken — typical D2C death spiral. Fix: raise margin via better SKU mix or repeat-purchase rate.
Agency / services, ₹2 L/mo ad spend + ₹1 L sales
40 leads × 25% close = 10 customers. CAC = ₹3 L / 10 = ₹30,000. ARPU ₹50,000 × 45% = ₹22,500/mo profit. Payback ≈ 1.3 mo. LTV (12 mo) = ₹2.7 L. LTV:CAC = 9x. Strong — reinvest in scaling.
Frequently Asked Questions
Still have a question? Our team replies within a business day.
There is no universal number — only ratios. Aim for LTV:CAC ≥ 3x and payback ≤ 12 months. For India SMB SaaS with ARPU ₹2,000–5,000/mo, CAC of ₹15,000–₹40,000 is typical. Lower than that usually means undercounting sales cost.
Yes — fully loaded. Include base salary, variable commission, tooling (CRM, dialer, sales intelligence), and any portion of marketing salaries directly tied to acquisition. Excluding these is the most common CAC understatement.
Estimate retention months as 1 / monthly churn rate. If you churn 5% per month, retention is 20 months. For new businesses, use the lower bound — be conservative on LTV; CAC is what it is, but LTV is a forecast.
Blended CAC includes organic and referral acquisitions in the denominator (cheaper). Paid CAC counts only customers from paid channels in the denominator (more accurate for evaluating ad spend). For ad-channel decisions, use paid CAC.
CAC is a one-time number; payback tells you how long your money is locked up. A ₹50,000 CAC with 4-month payback is far better than ₹20,000 CAC with 18-month payback — the former lets you redeploy capital 4.5x more often per year.
Yes — set retention to 1 month. The calculator will model a single-purchase customer, and LTV will equal the gross profit from that one purchase. CAC and payback comparison still applies.
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