Free CAC ToolCAC, LTV:CAC & Payback
Free CAC Calculator

Customer Acquisition Cost Calculator

Add your marketing and sales spend and new customers to instantly get your CAC, lifetime value, LTV:CAC ratio, and payback period in months — no email required.

CAC instantlyLTV:CAC ratioPayback in monthsNo email required

Your Numbers

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For LTV & payback

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The formula: CAC = (Marketing + Sales Spend) ÷ New Customers. All figures are estimates for planning purposes.

Customer Acquisition Cost$300.00
Lifetime Value (LTV)$2,520.00Gross-margin LTV
LTV : CAC Ratio8.4 : 1
CAC Payback2.1 moMonths to recover CAC
Gross Margin70.00%Across 18 months

Health Check

8.4 : 1 — healthy. You may have room to invest more aggressively in growth. A ratio above 3:1 is healthy, while roughly 1:1 means you're breaking even.

LTV here is gross-margin lifetime value: revenue × lifespan × gross margin.

Payback period uses monthly gross-margin revenue per customer.

Include all fully-loaded marketing and sales costs for an accurate CAC.

Education

Understanding CAC & Unit Economics

CAC, LTV, and payback are the core of sustainable growth. Here's what each one means and how they fit together.

01

What CAC Is

Customer acquisition cost is the total marketing and sales spend required to win one new customer over a period — the price tag of growth.

02

What To Include

Roll in ad spend, salaries, commissions, agency and tool costs, and creative. A "fully-loaded" CAC is far more honest than ad spend alone.

03

LTV Explained

Lifetime value is the gross-margin revenue a customer generates over their whole relationship: monthly revenue × lifespan × gross margin.

04

The 3:1 Rule

A healthy LTV:CAC ratio is around 3:1 — three dollars of value for every dollar spent acquiring. Below 1:1 you lose money; very high can mean underinvesting.

05

CAC Payback Period

How many months a customer takes to repay their acquisition cost from gross-margin revenue. Shorter payback frees up cash to reinvest in growth.

06

How To Lower CAC

Lift funnel conversion rates, lean into your best channels, build referral loops, sharpen targeting, and improve retention so efficiency compounds.

Common Questions

Frequently Asked Questions

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