What Is LTV:CAC Ratio?
The LTV:CAC ratio compares the gross profit a customer generates over their lifetime (LTV) to the cost of acquiring them (CAC). It's the single number that tells you whether your business can spend more to grow, or whether every extra dollar of ad spend is buying losses.
Also known as: ltv to cac ratio, ltv cac ratio, customer lifetime value to acquisition cost, ltv cac formula. This page answers "what is LTV:CAC Ratio", LTV:CAC Ratio formula,LTV:CAC Ratio calculation, and LTV:CAC Ratio benchmarks for Bangladesh and global performance marketing teams.
Formula
LTV should be gross profit, not revenue, revenue LTV overstates by whatever your COGS is. CAC should include all marketing + sales spend, not just ad platform spend. Both mistakes are so common they distort most 'ROAS is fine' arguments.
Worked example
A subscription brand has average customer LTV of $360 (gross profit over 24 months). Fully-loaded CAC (ads + agency + tools + sales) is $90. LTV:CAC = 360 ÷ 90 = 4:1, healthy, room to scale. If CAC rises to $180 while LTV holds, ratio drops to 2:1, near the payback ceiling; scaling here means longer payback period and cash-flow strain even though revenue grows.
Benchmarks
- 3:1, the widely cited healthy floor. Below this, scaling is risky.
- 4:1 to 5:1, the sweet spot; enough margin to reinvest and absorb bad quarters.
- > 6:1, usually a sign of under-spending. You're leaving growth on the table.
- < 2:1, you're running a treadmill. Fix retention or offer before adding spend.
Bessemer's State of the Cloud pegs a healthy SaaS LTV:CAC at 3× or higher; companies below 1× typically fail within 24 months without a capital injection.
Why it matters
ROAS tells you what happened yesterday. LTV:CAC tells you what your business can afford to pay tomorrow. Every 'we can't scale profitably' conversation ends with an LTV:CAC calculation, usually revealing that CAC crept up unnoticed, or that the LTV assumption was based on 12-month cohorts before churn kicked in.
Common mistakes
- 1.Using revenue LTV instead of gross-profit LTV. Overstates the ratio by 30 to 80%.
- 2.Excluding agency fees, tool costs, and sales salaries from CAC. That's not CAC, that's ad platform CPA.
- 3.Extrapolating LTV from 3-month cohorts. You don't know retention until you've measured it.
- 4.One blended ratio for the whole business. Channels and cohorts have wildly different LTV:CAC.
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FAQs about LTV:CAC Ratio
Why is 3:1 the standard LTV:CAC benchmark?
It leaves roughly 1x for CAC recovery, 1x for operating costs, and 1x for reinvestment / profit. Below 3:1 the reinvestment budget dries up; above 5:1 you're usually growing too slowly to be worth the discipline.
How long a horizon should LTV cover?
12 to 36 months for most businesses. Shorter than 12 penalises retention. Longer than 36 makes assumptions you can't verify, modern churn behaviour changes fast.
What if I don't have enough data for LTV?
Use projected LTV: (AOV × gross margin × expected repeat purchases per year) × expected retention years. Recalculate quarterly as cohorts mature.
How does LTV:CAC relate to payback period?
Payback tells you when a customer pays back their CAC in gross profit. LTV:CAC tells you total lifetime economics. A 4:1 LTV:CAC with 18-month payback and a 4:1 with 3-month payback are very different businesses.
Related terms
Total gross profit a customer generates across their relationship.
Total marketing + sales spend divided by new customers acquired.
Ad spend divided by conversions, the price of one action.
Revenue attributed to ads ÷ ad spend, the fastest efficiency read.
% of customers still active after a given time window.
Average revenue per transaction, total revenue ÷ number of orders.
Total revenue ÷ total ad spend, the blended, attribution-free ROAS.
Net profit from an investment as a % of the amount invested.