Customer Lifetime Value (CLTV) Calculator
Estimate how much gross profit one customer can generate over their full relationship with your business.
What is CLTV?
Customer Lifetime Value (CLTV, sometimes written as LTV) is the estimated total gross profit a single customer contributes during their entire relationship with your company. Instead of focusing only on first purchase revenue, CLTV helps you see the long-term economics of retention, repeat buying, and margin.
If you run ecommerce, SaaS, coaching, or a service business, CLTV is one of the most useful metrics for making decisions around acquisition budgets, pricing, and customer experience investments.
Formula used in this CLTV calculator
This calculator combines a simple lifetime estimate with an optional discounted cash flow approach:
- Annual Revenue per Customer = Average Order Value × Purchases per Year
- Annual Gross Profit per Customer = Annual Revenue × Gross Margin
- Estimated Customer Lifespan (years) = 1 ÷ (1 − Retention Rate)
- Undiscounted CLTV = Annual Gross Profit × Lifespan
- Discounted CLTV = Sum of future annual gross profit adjusted by retention and discount rate
- Net CLTV = Discounted CLTV − CAC
How to use the calculator
1) Enter your unit economics
Start with average order value, purchase frequency, and gross margin. These three numbers define annual gross profit per customer.
2) Add retention and optional discount rate
Retention rate drives customer lifespan. If your retention is weak, CLTV collapses fast. The optional discount rate adjusts future cash flows to present value.
3) Add CAC to get net CLTV
If customer acquisition cost is provided, the calculator also gives net CLTV and LTV:CAC ratio so you can evaluate marketing efficiency.
Quick interpretation guide
- Higher annual gross profit means each customer year is more valuable.
- Higher retention increases lifespan and compounds CLTV.
- High CAC with low CLTV indicates unsustainable growth.
- LTV:CAC ratio is often targeted at 3:1 or better, depending on business model and payback speed.
Example: small subscription business
Imagine you have the following numbers:
- Average annual spend per customer: $240 (or $20/month equivalent)
- Gross margin: 70%
- Retention: 85%
- Discount rate: 10%
- CAC: $150
Your CLTV may look attractive at first glance, but the discounted and net figures can reveal whether your acquisition strategy still makes sense once risk and time are considered.
How to improve CLTV in practice
Increase average order value
Use bundles, premium tiers, value-based packaging, and intelligent upsells to raise revenue per transaction without forcing frequency.
Increase purchase frequency
Build post-purchase journeys: replenishment reminders, usage triggers, loyalty perks, and lifecycle campaigns that bring customers back faster.
Improve retention
Retention has outsized impact on CLTV. Improve onboarding, customer education, response times, and product outcomes to reduce churn.
Protect margin
Revenue growth without margin discipline can hide weak CLTV. Track contribution margin by channel and avoid discounting habits that destroy lifetime profitability.
Common CLTV mistakes to avoid
- Using revenue instead of gross profit
- Ignoring churn and assuming unlimited customer life
- Comparing CLTV to CAC without considering payback period
- Mixing customer segments with very different behavior
- Treating one CLTV number as permanent instead of re-measuring quarterly
Final takeaway
CLTV is not just a finance metric; it is a strategy metric. It connects product value, retention quality, marketing efficiency, and long-term profitability. Use this calculator regularly, segment your customers, and let CLTV guide smarter decisions about growth.