CAC Calculator
Customer Acquisition Cost + LTV:CAC ratio in one tool
Free CAC calculator. Compute Customer Acquisition Cost, LTV, LTV:CAC ratio, and payback period. Essential for measuring paid growth efficiency.
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What is a CAC Calculator?
Customer Acquisition Cost (CAC) is the total cost of sales and marketing divided by the number of new customers acquired in the same period. It is the most fundamental unit economics metric for any growth-stage business — it tells you how much you pay to bring one customer through the door.
CAC alone is incomplete. A ₹20,000 CAC is excellent if each customer generates ₹2,00,000 in lifetime value; it's fatal if they generate ₹18,000. That's why this calculator pairs CAC with LTV (Customer Lifetime Value), LTV:CAC ratio, and CAC payback period — the three benchmarks investors and growth teams live by.
The LTV:CAC ratio benchmarks: below 1× means you are losing money acquiring customers, 1–3× is tight but viable, 3× is the widely cited "healthy" threshold, and 5×+ is the signal of a capital-efficient growth machine that should scale aggressively. Payback under 12 months generally means you can reinvest cash quickly without needing external capital.
Why use this CAC Calculator
Built for Indians, by Indians. Every number, every formula, every slab — tuned to FY 2026-27 reality.
LTV:CAC ratio
Compares lifetime value against acquisition cost — the core venture benchmark for growth health.
CAC payback period
How many months until you recover what you spent to acquire the customer.
Verdict colour-coding
Green / yellow / red verdict instantly flags Healthy / Tight / Unprofitable unit economics.
Blended CAC
Combines sales + marketing spend for a blended CAC — the realistic number, not just ad spend.
Using the CAC Calculator in 4 steps
No onboarding, no signup. Answer three fields and the numbers update live.
Enter sales and marketing spend
Use the total for a consistent period (month or quarter). Include salaries, ad spend, agency fees, tools, events — every cost that drives acquisition.
Enter new customers in the same period
Customers acquired (not just leads or trials). Match the period exactly to the spend.
Enter ARPU and gross margin
Average monthly revenue per customer and your gross margin %. For SaaS, margin is typically 70–85%. For D2C, 25–45%.
Interpret the result
LTV:CAC ≥ 3× with payback < 12 months is the target zone. If you're below, focus on either reducing CAC or improving retention (which raises LTV).
Tips to get the most out of it
Separate paid CAC from blended CAC. Blended CAC (total S&M / new customers) includes organic — divide by paid-only customers to see your true paid channel efficiency.
Never look at CAC in isolation. A rising CAC is fine if LTV is rising faster. What matters is the ratio and payback, not the absolute number.
For subscription businesses, improve LTV before trying to cut CAC — a 1% drop in monthly churn has more impact than a 10% reduction in ad CPM.
Cohort your CAC by channel. Organic search customers often have 2–3× higher LTV than paid social — blending them hides the quality difference.
Benchmark: SaaS companies IPO-ready typically show LTV:CAC of 5× or higher with payback under 18 months. Below 3× suggests the model needs structural work.
Real-world scenarios
How Indians actually use this calculator — concrete inputs, concrete outcomes.
B2B SaaS startup
S&M spend: ₹8L/month. New customers: 40. CAC = ₹20,000. ARPU ₹8,000/mo, 80% margin, 5% monthly churn → LTV ₹1.28L. LTV:CAC = 6.4×. Payback 3.1 months. Excellent — scale.
D2C beauty brand
S&M: ₹5L/month. New customers: 500. CAC = ₹1,000. ARPU ₹2,000/mo, 40% margin, 10% churn → LTV ₹8,000. LTV:CAC = 8×. Payback 1.25 months. Exceptional unit economics.
Fintech lending app
S&M: ₹30L/month. New borrowers: 300. CAC = ₹10,000. ARPU ₹1,500/mo, 60% margin, 3% churn → LTV ₹30,000. LTV:CAC = 3×. Payback 11 months. Healthy but watch churn.
Frequently Asked Questions
Still have a question? Our team replies within a business day.
Yes, for blended CAC. Include sales rep salaries, marketing team, and agency fees. The purpose is to know the true cost of growing your customer base. Excluding salaries flatters the number without reflecting reality.
It uses a 24-month simplified LTV: LTV = ARPU × Gross Margin × 24. This is conservative for low-churn businesses. The LTV calculator on this site uses the churn-based formula (1/churn rate) for a more accurate long-run estimate.
Under 12 months for most businesses. Under 6 months for capital-efficient D2C. SaaS companies with low churn can sustain 18–24 month payback. Above 24 months usually needs outside funding to sustain growth.
Three main levers: (1) improve conversion rate at each funnel stage, (2) improve creative/copy quality to lower CPM/CPC, (3) invest in organic channels (SEO, referral, content) to reduce paid dependency. Referral programs often yield the lowest CAC of any channel.
Very high LTV:CAC (10×+) can mean under-investment in growth — you could afford to spend more and grow faster. The goal is to find the optimal spend level where LTV:CAC stays above 3× while maximising revenue growth rate.
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