Free calculator · CAC / LTV

Marketing ROI Calculator (CAC / LTV)

Instant calculation of customer acquisition cost, lifetime value, and business-health ratio (LTV:CAC). Enter marketing spend + customer metrics — get all the numbers.

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  • Result in under a second
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Enter your marketing metrics

Spend, new customers, ARPC and retention — we'll compute every metric.

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All marketing spend: Google, Meta, content, agency, events.
Average number of new customers acquired per month.
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ARPC: what an average customer pays per month (not package price — actual average).
Average months a customer stays. SaaS: 12-36. One-off: 1.
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Profit after cost of goods. Service: 70-90%. Products: 30-50%.

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Common questions

What is CAC and why does it matter?

CAC = Customer Acquisition Cost. Formula: total marketing spend / new customers per month. It is the most basic marketing-efficiency metric.

How do you calculate LTV correctly?

LTV = monthly ARPC × gross margin × retention months. Use gross margin (not revenue) — otherwise LTV is inflated.

What is a healthy LTV:CAC ratio?

Industry convention: 3:1 (LTV is 3× CAC) is the baseline for sustainability. Below 1 = losing on every customer. 3-5 = healthy. Above 5 = great but possibly under-investing in growth.

What is a reasonable marketing payback period?

Under 12 months = efficient. 12-18 = OK but needs bridge financing. Over 18 = problematic for an SMB without investors.

How does FullnessCRM track these metrics?

FullnessCRM integrates with Google Ads, Meta Ads and other channels, joins with actual CRM purchases, and shows CAC, LTV and customer source in one dashboard — no monthly spreadsheet.

Want to track these metrics automatically?

FullnessCRM integrates with your marketing channels, joins with sales data, and shows CAC, LTV and customer source in one dashboard.

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