Customer lifetime value

Why it matters

Without a lifetime figure, every acquisition decision is made on the first sale, and the first sale is often barely profitable. Knowing that an average customer is worth, say, $900 in gross profit over three years tells you that spending $200 to win one is sensible and spending $700 is not. It also exposes the difference between customer segments: the ones who look small on an invoice but stay for a decade, and the ones who look large but leave after one job and a complaint.

Build the simple version from your own records

You need three numbers, all of which live in your accounting or point-of-sale system. First, the average gross profit per purchase: average sale value minus the direct costs of delivering it, such as materials, stock, subcontractors and direct labour. Second, how many times the average customer buys per year. Third, how long the average customer stays, which you can estimate from your churn rate or by looking at when customers who joined three or four years ago stopped buying.

Multiply the three and you have a gross-profit LTV. It will not be exact. It does not need to be: the question it answers is "roughly what is a customer worth to us?", and an answer within 20 per cent is enough to make good decisions.

Compare it with what a customer costs

LTV is most useful next to customer acquisition cost (CAC). The ratio tells you whether growth is affordable. A business whose customers are worth $900 and cost $300 to win has a ratio of 3:1 and can grow by spending more. A business at 1.2:1 is spending nearly everything a customer will ever earn just to acquire them, and needs to fix retention, pricing or channel mix before buying more growth.

Many businesses use a target of around three times CAC as a sensible floor, but the right ratio depends on your margins, how quickly the gross profit arrives and how much cash you have. A customer worth $900 over five years is a very different proposition to one worth $900 in the first six months, because you have to fund the gap.

• LTV well above CAC: you can afford to spend more on acquisition, or on service that lifts retention further.
• LTV close to CAC: fix the leak before scaling. Retention or margin, not more advertising.
• LTV below CAC: every new customer loses money. Stop and rethink pricing, channel or target customer.
• Also check payback period: how many months until gross profit covers CAC. Shorter protects cash flow.

Segment, because the average hides the story

A single LTV figure across all customers is a start, but the real insight comes from splitting it by segment: customer type, acquisition channel, product line or location. Most small businesses find that a small group of customers accounts for a large share of lifetime value, and that one acquisition channel produces customers worth several times those from another.

Those differences should change behaviour. Direct more acquisition spend at the channels and customer types with high LTV. Design onboarding and service around keeping high-value segments. Consider whether low-LTV segments can be priced differently, served more cheaply or politely declined.

Use it to make four decisions

LTV earns its place when it changes what you do. First, acquisition: set a maximum CAC per channel based on the LTV of customers it produces. Second, retention: a 10 per cent reduction in churn lifts LTV directly, so you can put a dollar value on service improvements. Third, pricing: small price increases on high-retention segments often raise LTV more than any marketing. Fourth, focus: the segments with the highest LTV define your ideal customer profile for the next year.

Revisit the figures every six months. LTV moves as pricing, retention and channel mix change, and the trend is as informative as the number.

How to calculate and use customer lifetime value

1. Work out gross profit per purchase Average sale less direct costs, from your accounting or point-of-sale data.
2. Count purchases per customer per year Total transactions divided by active customers over the last 12 months.
3. Estimate years retained From churn (1 ÷ annual churn) or by tracking when past customers stopped buying.
4. Multiply to get LTV Gross profit per purchase × purchases per year × years retained.
5. Calculate CAC and the ratio Sales and marketing spend divided by new customers; compare LTV to CAC and check payback time.
6. Segment by channel and customer type Find where high-value customers come from and who they are.
7. Set spending limits and priorities Maximum CAC per channel, retention investments and the segments to pursue.
8. Review every six months Watch the trend as pricing, retention and mix change.

Real-world example

A Brisbane dog groomer discovers who her best customers are

Paws & Co is a dog grooming salon in Brisbane’s western suburbs. The owner, Renee, charges an average of $95 per groom with about a 40 per cent gross margin after product, consumables and groomer wages, so each visit earns roughly $38 of gross profit. Her records show the average client books eight grooms a year and stays about three years. Her simple LTV is $38 × 8 × 3, or about $912 per client.

Renee then splits clients by how they found her. Clients from referrals and the local vet stay closer to four years and book more often, pushing their LTV past $1,200. Clients from a half-price first-groom promotion mostly book twice and disappear, worth around $80 each. Her blended CAC is about $120, a healthy ratio overall, but the promotion customers lose money. She stops the discount, offers the vet a referral card instead, and raises her price by $5 for existing clients, who barely notice. Her projected LTV per client rises to over $1,000, and her bookings calendar fills with the kind of client who stays.

Common mistakes

• Using revenue instead of gross profit Revenue LTV flatters big, low-margin customers. Always subtract the direct cost of delivery.
• Guessing the inputs Purchase frequency and lifetime are in your records. A guess feels precise and misleads.
• Stopping at the average The average hides the segments that matter. Split by channel and customer type.
• Ignoring payback time A customer worth $900 over five years can still break your cash flow if CAC is $400 up front.
• Building a model nobody updates A simple figure reviewed twice a year beats a complex one that is stale within months.

KPIs to track

• Customer lifetime value Gross profit per purchase × frequency × years retained. Track overall and by segment.
• LTV to CAC ratio How many times a customer’s lifetime gross profit covers their acquisition cost. Around three or better is a common comfort zone.
• CAC payback period Months until a customer’s gross profit covers the cost of winning them. Shorter protects cash flow.
• Purchase frequency Transactions per active customer per year. A lever you can move through reminders and service.
• Average customer lifetime Years a customer stays, derived from churn. Every retention improvement shows up here.

Frequently asked questions

Do I need special software to calculate LTV?

No. Your accounting and point-of-sale or invoicing data has everything you need for the simple version, and a spreadsheet does the arithmetic. Software helps when you want to segment many customers automatically.

How accurate does LTV need to be?

Accurate enough to make a decision. A figure within about 20 per cent is enough to set an acquisition budget or compare channels. Precision matters less than updating the inputs regularly.

What if I am a new business with no history?

Use conservative estimates for frequency and lifetime, state them as assumptions, and replace them with real figures after a year. Even an assumed LTV disciplines early acquisition spending.

Should I include referrals in LTV?

The simple version does not, which means it understates the value of customers who refer. If referrals are a major channel, note the referral rate by segment alongside LTV when you make decisions.

Key takeaways

• Lifetime value turns a customer from a transaction into a relationship with a measurable worth.
• Build the simple version from gross profit, purchase frequency and years retained, using your own records.
• Compare LTV with acquisition cost and payback time before spending to grow.
• Segment by channel and customer type; the average hides where the value is.
• Use LTV to set acquisition limits, value retention work, test pricing and define your ideal customer.