Skip to content

How to Calculate Customer Lifetime Value (LTV) — Simple Steps for Small Businesses

Why LTV matters for your business

Customer lifetime value (LTV) tells you how much profit one customer brings over the time they buy from you. Knowing LTV helps you decide how much to spend on marketing, when to offer discounts, and which customers to focus on.

Quick overview: the basic formula

Basic LTV = Average purchase value x Average purchases per period x Average customer lifespan (in the same periods). For profit-focused LTV, subtract your gross margin.

Step-by-step: Calculate a simple LTV

Use this when you don’t have fancy analytics. Pick a time period (monthly or yearly). I’ll use yearly in the example.

  1. Collect three numbers:
    • Average Purchase Value (APV): total sales / number of orders in a year.
    • Purchases per Customer per Year (PPY): total orders / number of unique customers in a year.
    • Average Customer Lifespan in Years (ACL): how long a customer continues buying from you on average.
  2. Multiply them: LTV = APV x PPY x ACL.
  3. Adjust for profit (optional but recommended): Multiply LTV by your gross margin percentage (e.g., 60% = 0.6) to get profit LTV.

Concrete example

Cafe example — numbers from last year:

  • Total sales: $120,000
  • Total orders: 24,000
  • Unique customers: 6,000
  • Gross margin: 70% (coffee + food cost removed)
  • Estimate average customer lifespan: 3 years (regulars stick around)

Step A — APV: $120,000 / 24,000 = $5 per order.

Step B — PPY: 24,000 / 6,000 = 4 orders per customer per year.

Step C — ACL: 3 years.

Basic LTV: $5 x 4 x 3 = $60.

Profit LTV: $60 x 0.70 = $42. So a typical customer delivers $42 gross profit over their lifetime.

How to estimate Average Customer Lifespan (ACL)

If you have historical data: measure how long customers keep buying. If not, use this simple approach:

  • If customers buy once and never return: ACL = 0.1–0.5 years (one-off).
  • Occasional repeat buyers (seasonal): ACL = 1–2 years.
  • Regular buyers (monthly/weekly): ACL = 2–5 years or more.

Decision rule: if unsure, pick a conservative number (lower) to avoid overestimating LTV.

Monthly LTV (if you track monthly)

Same math but use monthly numbers. Example: APV $20, PPY (monthly) = 2 orders/month, ACL = 24 months → LTV = $20 x 2 x 24 = $960.

More accurate LTV with retention rate

Use this if you can track what percent of customers return each period.

  1. Retention rate (r) = % of customers who buy next period (0–1).
  2. Average lifespan ≈ 1 / (1 - r). Example: r = 0.8 → ACL ≈ 1 / (1 - 0.8) = 5 periods.

Then use APV x PPY x ACL as before. Use this when you have reliable retention numbers.

Checklist: data to gather

  • Total sales and total orders for your chosen period (monthly/yearly).
  • Number of unique customers in that period.
  • Rough estimate of how long customers stick around.
  • Your gross margin percentage (or gross profit dollars).

Checklist: calculations to run

  • APV = total sales / total orders.
  • PPY = total orders / unique customers.
  • ACL = measured or estimated lifespan (periods).
  • Basic LTV = APV x PPY x ACL.
  • Profit LTV = Basic LTV x gross margin %.

When to use LTV: simple decision rules

  • If profit LTV > customer acquisition cost (CAC): you can spend up to that CAC and still profit.
  • If profit LTV is close to CAC (within 20%): tighten marketing and reduce CAC before scaling.
  • If profit LTV < CAC: stop or rework the campaign; improve retention or increase price.

How to improve LTV (practical moves)

  • Increase purchase frequency: run email offers, subscription, or loyalty programs.
  • Raise average order value: bundle products, add upsells, or free shipping threshold.
  • Extend lifespan: follow-up, reactivation campaigns, VIP perks for repeat buyers.
  • Improve gross margin: renegotiate supplier prices or adjust pricing strategy.

Example next steps for a busy owner (30–60 minute actions)

  1. Pull last 12 months: total sales, total orders, unique customers — calculate APV and PPY.
  2. Pick a conservative ACL (1–3 years for most small retail/service businesses) and compute basic LTV.
  3. Multiply by gross margin to get profit LTV.
  4. Compare profit LTV to what you pay to get a customer (ad spend, coupons, referral costs).
  5. If CAC < profit LTV, test scaled marketing. If CAC ≥ profit LTV, lower CAC or improve LTV first.

Final quick formula cheat-sheet

APV = total sales / total orders

PPY = total orders / unique customers

ACL = average customer lifespan (in same period)

Basic LTV = APV × PPY × ACL

Profit LTV = Basic LTV × gross margin %

Common mistakes to avoid

  • Using one-time buyers as if they were repeat buyers — lowers accuracy.
  • Forgetting to use profit margin — revenue LTV can be misleading.
  • Overestimating lifespan — be conservative until you have data.

Use these steps and the simple checks to start making smarter marketing and pricing choices today.