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A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11Calculate customer acquisition cost (CAC) by dividing acquisition spend by the number of new customers acquired in the same period. Calculate break-even revenue separately: divide the fixed expenses you want to cover by the contribution margin ratio. CAC payback is a third measure—it estimates how many months of customer contribution it takes to recover CAC.
Calculate customer acquisition cost
CAC = acquisition spend ÷ new customers acquired over the same measurement period. Before calculating, decide which costs count as acquisition spend, what qualifies as a new customer, and how customers are attributed to the period. Record those choices beside the result; a paid-media-only CAC and a fully loaded sales-and-marketing CAC measure different scopes. The American Marketing Association’s CAC calculator likewise emphasizes defining the customer and cost scope and aligning the periods.
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For example, if a business spends $50,000 on its chosen acquisition costs and gains 100 new customers in that same period, CAC is $500 per customer. This is an illustration of the arithmetic, not an industry benchmark.
Calculate break-even revenue
Break-even revenue = fixed expenses ÷ contribution margin ratio. Contribution margin is revenue left after variable expenses; the ratio is contribution margin divided by revenue. That contribution covers fixed expenses, and any remaining contribution adds to earnings if the model’s prices and costs hold. Keep the fixed-expense period and margin assumptions aligned. AccountingCoach states the formula as total fixed expenses divided by the contribution margin ratio.
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Worked example
With $100,000 in annual fixed expenses and a 20% contribution margin ratio, annual break-even revenue is $100,000 ÷ 0.20 = $500,000. At that sales level, $400,000 covers variable expenses and the remaining $100,000 of contribution covers fixed expenses. This is AccountingCoach’s instructional example, not a typical-business result; it assumes the stated ratio applies across the year.
For a single product or a product mix
For one product sold at a stable price, unit break-even is fixed costs ÷ (selling price per unit − variable cost per unit). For multiple products or services, the contribution margin ratio depends on the sales mix. If that mix shifts, recalculate the weighted average ratio or model each product line separately; one average can mislead when margins differ. See AccountingCoach’s explanation of break-even in sales dollars and the Corporate Finance Institute’s CVP analysis resource.
Estimate CAC payback separately
CAC payback estimates the time for a customer’s contribution to recover acquisition cost. For recurring monthly revenue, first subtract the variable costs of serving the customer to find monthly contribution, then calculate CAC ÷ monthly contribution. Using revenue alone ignores service costs and can make payback look shorter than it is. Stripe describes monthly customer profit as monthly revenue minus monthly costs, then divides CAC by that monthly profit: What is the CAC payback period?
For example, with $500 CAC, $100 monthly revenue per customer, and an 80% gross margin, monthly gross profit is $80 and simple gross-margin-adjusted payback is $500 ÷ $80 = 6.25 months. This arithmetic illustration assumes stable monthly revenue and margin; it does not model churn, within-month timing, expansion, refunds, or other variable serving costs.
Know which question each metric answers
| Metric | Question answered | Basic calculation | Unit |
|---|---|---|---|
| CAC | What acquisition spend was required for each new customer? | Period acquisition spend ÷ new customers in that period | Currency per customer |
| Break-even revenue | How much sales revenue covers the selected period’s fixed and variable expenses? | Fixed expenses ÷ contribution margin ratio | Currency per period |
| CAC payback | How long until customer contribution recovers CAC? | CAC ÷ monthly customer contribution | Months |
Customer payback is not company break-even. Payback tracks recovery of acquisition spend from a customer’s contribution over time. Company break-even is the revenue level at which the defined period’s revenues cover its fixed and variable expenses. AccountingCoach discusses the distinction between break-even point and payback period.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Make the estimate useful for a real decision
- Show the time period and cost scope beside CAC, and use a consistent definition of “new customer.”
- For break-even, state which fixed expenses are included and the contribution margin ratio used.
- Specify whether the model covers one product, a product mix, a channel, or the whole business.
- For payback, show monthly contribution after direct service costs and state any assumptions about retention and revenue timing.
Break-even is a planning estimate, not a guarantee. It is most useful when selling prices, variable costs, fixed expenses, and product mix remain reasonably stable. If those assumptions change, recalculate the margin ratio and break-even point. The sources establish calculation methods and examples, not a representative cross-industry benchmark for “good” CAC or a universal CAC-to-lifetime-value ratio. The right acquisition ceiling depends on a business’s contribution, retention, cash needs, and time horizon.
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