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CUSTOMER ACQUISITION

Customer Acquisition & LTV Calculators

Work out what a new customer is worth, what you can afford to pay to acquire one, and where first-order profitability ends and longer-term value begins.

Reviewed September 23, 2026 · ROAS Lab Editorial Team

Before you open a calculator

A customer acquisition number is useful only when the definition is clear. “CPA” can mean an order, a lead, a trial, a booked call or a new customer. Before comparing it with lifetime value or contribution margin, decide exactly which event the cost represents.

For ecommerce, the safest starting point is usually first-order contribution: net order revenue minus product cost, fulfillment, payment fees and other variable costs. That tells you how much room exists before advertising. Lifetime value can justify a different acquisition target, but only when repeat-purchase data is mature enough to trust. A forecast based on two weeks of customer history is not the same thing as observed LTV.

Use this category when the practical question is “How much can we pay for growth?” rather than simply “What did the ad platform report?”

Calculators in this category

These tools answer different parts of the same business question. Use only the inputs that match the period and channel you are reviewing.

ACQUISITION LIMITMaximum CPA CalculatorEstimate the highest acquisition cost supported by your current unit economics.Open calculator →CUSTOMER VALUELTV:CAC CalculatorCompare lifetime customer value with acquisition cost using your own customer data.Open calculator →FIRST-ORDER ECONOMICSBreak-Even ROAS CalculatorTranslate order-level contribution into a revenue-efficiency floor.Open calculator →ORDER VALUEAOV CalculatorMeasure revenue per order before connecting it to acquisition economics.Open calculator →FUNNELConversion Rate CalculatorConnect paid traffic volume with the number of customers you can realistically acquire.Open calculator →PLANNINGROAS Scenario ComparisonTest how pricing, costs and profit targets change the acquisition ceiling.Open calculator →LEAD COSTCPL CalculatorMeasure upstream lead acquisition cost.Open calculator →CLOSE RATELead-to-Customer CalculatorConnect lead volume to customer acquisition.Open calculator →

ILLUSTRATIVE EXAMPLE

A $74 order does not mean you can spend $74 to acquire it

Assume an ecommerce order has $74 in net revenue. Product cost is $24, fulfillment and shipping are $9, and payment and other variable fees total $4. The order therefore produces $37 of contribution before advertising.

Net order revenue$74

Variable costs$37

Contribution before ads$37

Break-even CPA$37

If the business wants $10 of contribution left after acquisition, the operating CPA ceiling becomes $27 rather than $37. If reliable cohort data later shows that a customer produces additional contribution from repeat orders, the team can model that separately instead of quietly assuming every customer will repeat.

This is an illustrative scenario, not a benchmark or a claim about typical performance. Replace every number with your own store, CRM and ad-platform data.

DATA CHECKLIST

What to pull before calculating

Good calculator outputs depend on consistent inputs. Keep source dates and definitions beside the numbers so you can reproduce the result later.

Input	Where to get it	Check before using it
New-customer orders	Store or CRM	Exclude returning customers if the CPA target is specifically for new-customer acquisition.
Contribution per first order	Store + cost records	Use net revenue and variable costs from the same period.
Ad spend	Advertising platforms or finance	Include the channels that are actually responsible for the acquisition target.
Observed repeat purchase value	CRM or cohort report	Use a mature cohort; do not annualize a very short observation window without labeling it a forecast.
Refunds and cancellations	Store or payment processor	Use realized or defensible expected rates, especially when returns arrive weeks after the sale.

QUALITY CHECK

Three mistakes that change the answer

Comparing unlike definitions

A platform CPA for purchases should not be compared with a CRM CAC that includes sales payroll, agency fees and other acquisition costs unless you reconcile the definitions first.

Treating revenue as customer value

A $200 lifetime revenue figure is not $200 of economic value. Product cost, service cost, refunds and other variable costs still matter.

Using future repeat orders to hide a weak first order

A business may intentionally acquire below first-order break-even, but that decision should be explicit and supported by observed retention data.

WEEKLY REPORTING

Where this belongs in a real report

Put acquisition cost beside the economic ceiling, not on a page by itself. A useful weekly line might read: new-customer CPA $29 / operating ceiling $32 / first-order contribution $36. That immediately shows whether the account has room to scale or is consuming nearly all available contribution.

Review LTV:CAC less frequently than platform CPA if lifetime value changes slowly. Acquisition cost can move every day; mature customer value usually needs a longer observation window.

Questions people usually ask after the first calculation

Is maximum CPA the same as CAC?

Not necessarily. CPA often refers to the advertising cost for a conversion. CAC may include a broader set of acquisition costs. Use the same definition on both sides of a comparison.

Can I use lifetime value to accept a first-order loss?

You can model that strategy, but the repeat-value assumption should come from observed cohort behavior and should be separated from first-order economics.

What if customers buy different products on the first order?

Use product or cohort segments when margins differ materially. A blended average can hide an unprofitable acquisition pattern in one product group.

How often should I recalculate maximum CPA?

Recalculate when price, discounting, product mix, fulfillment cost, refund behavior or target profit changes materially.

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