CAC Calculator
Calculate acquisition efficiency with payback and LTV:CAC context.
Result
CAC is spend divided by acquired customers in the same period.
Supporting metrics
The headline value alongside the engine's top supporting outputs.
How to use it
- Enter sales and marketing spend, new customers acquired, monthly ARPU, gross margin, and monthly churn for the same measurement period. Include all true acquisition costs such as paid media, acquisition-focused sales labor, agencies, and tools, but exclude retention-only work if you want a clean CAC view.
- Read CAC, payback period, gross profit per user per month, LTV, and LTV:CAC ratio. As a rule of thumb, LTV:CAC of 3 or higher is healthy, under 1 means you lose money on acquisition, and payback above 18 months is cash-flow heavy for most growing SaaS businesses.
- Interpret the metrics together instead of cherry-picking one. A seemingly acceptable CAC can still be dangerous if payback is long, and a great LTV:CAC ratio above 5 can mean you are actually under-spending on a channel that deserves more budget.
- Use the result to set CAC caps per channel, adjust bid targets, and decide whether the next dollar should go to conversion improvement, lower spend, or retention. If CAC is fine but LTV:CAC is weak, churn is probably the more important fix than top-of-funnel volume.
- Re-run monthly and by channel or campaign cohort. Track CAC, payback, and LTV:CAC side by side over time because a falling CAC can still mask worsening retention or margin erosion.
Questions people usually ask
What is a good CAC to LTV ratio?
The 3:1 ratio is the standard benchmark: customer lifetime value should be at least 3× the cost to acquire them. At 3:1, you recover acquisition cost in roughly one-third of the customer relationship and profit the rest. Below 1:1 means you lose money on every customer. Above 5:1 often signals underinvestment in growth.
What is typically included in CAC calculation?
All sales and marketing costs to acquire a new customer: paid advertising spend, agency fees, sales team salaries and commissions (prorated to new acquisition activity), tools and software, events, content creation. Exclude account management and retention costs — those belong in LTV calculation.
How long should it take to recover CAC?
SaaS benchmarks: under 12 months is excellent, 12-18 months is typical for B2B, over 24 months signals cash flow risk. E-commerce: under 6 months is strong. The payback period determines how much capital you need to scale — a 6-month payback lets you reinvest quickly; 18 months requires sustained funding.
Related Resources
Learn the decision before you act
Every link here is tied directly to CAC Calculator. Use the explanation, formula, examples, and benchmarks to pressure-test the calculator output from first principles.
How To Use
5 STEPSHow to Use A/B Test Significance Calculator
Validate your A/B test results to make data-driven decisions. Learn how to use this calculator to determine if observed differences in conversion rates.
ReadHow To Use
5 STEPSHow to Use Ad Spend / ROAS Calculator
Calculate ROAS from ad spend + revenue, then break it down by gross margin, contribution margin, and CAC payback at your scale.
ReadHow To Use
5 STEPSHow to Use CAC Calculator
CAC = fully loaded sales + marketing spend ÷ new customers. Check it against LTV:CAC to see whether to scale acquisition or fix unit economics first.
ReadHow To Use
5 STEPSHow to Use Churn & Retention Calculator
Master customer loyalty and growth with our Churn & Retention Calculator. Understand your customer base, identify loss trends, and strategize.
ReadHow To Use
6 STEPSHow to Use Content Marketing Payback Calculator
Calculate the payback period for your content marketing investments. Understand how long it takes for your content efforts to generate a positive return.
ReadHow To Use
6 STEPSHow to Use Email Marketing ROI Calculator
Calculate your email marketing return on investment with this practical guide. Understand campaign performance, optimize spending, and drive better.
ReadRelated deep dive
All articles →Read further
Long-form context behind the calculator output.
- Article·7 min
How to Calculate Customer Lifetime Value
Calculate CLV without overstating it: discount rate, cohort-based churn, and the gross-margin correction most CLV/CAC ratios get wrong.
Read - Article·7 min
How to Calculate ROI on Marketing
Calculate honest marketing ROI with CAC payback, gross-margin adjustments, and attribution windows that match your sales cycle — not vanity-metric ROAS.
Read - Pillar·13 min
Unit Economics for Pre-Seed
Unit economics at pre-seed: the 3:1 LTV/CAC heuristic lies for four structural reasons. Use a confidence-interval-honest formula plus three checks.
Read
Continue With Related Tools
See the revenue impact of reducing churn — even a small improvement compounds into significant retained revenue over time.
Open →Decide whether to ship the variant — check if your A/B test results are statistically significant before you commit.
Open →Decide whether to scale or cut ad spend — actual ROAS, break-even ROAS, profit, and target CPA for your campaigns.
Open →Decide if your email campaigns are worth the spend — projected revenue, ROI, CPA, and break-even conversion rate.
Open →More in Marketing & Acquisition
Know whether your marketing spend is building value or burning cash.
Decision Workflows
Step-by-step guides that use this tool.