LTV, CAC & Payback Period Calculator

LTV, CAC & Payback Period Calculator

Calculate Customer Lifetime Value (LTV), LTV:CAC ratio, and payback period. Assess the health of your unit economics and customer acquisition strategy.

Your Metrics

0.5%25%
10%95%

Unit Economics

Customer Lifetime Value (LTV)
$1,400.00
LTV:CAC Ratio
9.33:1
Payback Period
2.14 mo
Avg. Customer Lifetime
20.00 months

Health: Strong

Your unit economics are healthy. You have strong headroom to scale acquisition.

Churn Reduction Impact

Reducing your churn rate by just 1% (from 5% to 4%) would increase your LTV by 25.00%.

Under-Investing in Growth?

An LTV:CAC ratio above 5:1 often means you can afford to invest more in acquisition. Consider increasing ad spend or expanding channels.

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Understanding LTV, CAC, and Payback Period

Customer Lifetime Value (LTV), Customer Acquisition Cost (CAC), and payback period are the three most important unit economics metrics for any recurring revenue business.

Together, they tell you whether your business model is sustainable and how much you can afford to invest in growth.

What Is Customer Lifetime Value (LTV)?

LTV = (ARPU × Gross Margin) ÷ Monthly Churn Rate

Example: A SaaS company with $100/month ARPU, 75% gross margin, and 3% monthly churn → LTV = ($100 × 0.75) ÷ 0.03 = $2,500 per customer.

Key Insight

Churn has the biggest impact on LTV. Reducing monthly churn from 5% → 3% increases customer lifetime from 20 to 33 months — a 67% improvement.

What Is a Healthy LTV:CAC Ratio?

Below 1:1

Losing money on every customer. Immediate action needed.

1:1 – 3:1

Break-even to marginally profitable. Optimize before scaling.

3:1 – 5:1

Healthy. Room to scale acquisition profitably.

Above 5:1

Excellent, but you may be under-investing in growth.

Why Payback Period Matters

Payback period = CAC ÷ (ARPU × Gross Margin). Even with a strong LTV:CAC ratio, a long payback period creates cash flow problems.

Under 6 months

Excellent — strong cash flow and growth potential

6–12 months

Healthy — sustainable for most businesses

Over 18 months

Risky — significant working capital needed to fund growth

How to Improve Your Unit Economics

If your LTV:CAC ratio is below 3:1, focus on these levers:

Reduce CAC

Improve targeting, conversion rates, and channel efficiency

Increase ARPU

Add premium tiers, upsells, cross-sells, usage-based pricing

Reduce churn

Better onboarding, customer success, product quality

Pro Tip

Of these three, churn reduction typically has the biggest impact on LTV. Fix retention before you scale acquisition.

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Frequently Asked Questions

Common questions about using the LTV:CAC Calculator

A healthy LTV:CAC ratio is typically 3:1 or higher, meaning each customer generates 3x more value than it costs to acquire them. Below 1:1 means you're losing money on every customer. Between 1:1 and 3:1 is break-even to marginally profitable. Above 5:1 may indicate you're under-investing in growth.
LTV = (Average Revenue Per User × Gross Margin) ÷ Churn Rate. For example, if your ARPU is $100/month, gross margin is 70%, and monthly churn is 5%, your LTV = ($100 × 0.70) ÷ 0.05 = $1,400. This represents the total profit you can expect from an average customer over their lifetime.
For SaaS and subscription businesses, a payback period under 12 months is considered healthy. Under 6 months is excellent. If your payback period exceeds 18 months, your business may face cash flow challenges because you're spending more upfront than you're recovering quickly.
Churn rate is inversely proportional to LTV — higher churn means lower lifetime value. Reducing monthly churn from 5% to 3% increases average customer lifetime from 20 to 33 months, boosting LTV by 67%. This is why retention improvements often have a bigger impact than acquisition improvements.
If your ratio is below 3:1, focus on three areas: (1) Reduce CAC by improving conversion rates and targeting, (2) Increase ARPU through upsells, cross-sells, and pricing optimization, (3) Reduce churn through better onboarding, customer success, and product improvements. Our calculator helps you model different scenarios.

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