Free customer acquisition cost (cac) calculator
Enter your sales and marketing spend and new customers acquired — this customer acquisition cost calculator returns CAC, payback period, and the LTV/CAC ratio, updated live, as you type.
On this page10 sections
ROI = (gain − cost) ÷ cost × 100. This is simple ROI and does not account for time value of money.
Results are estimates. Consult a professional.
How the customer acquisition cost calculator works
Customer acquisition cost (CAC) is the total amount your business spends to acquire a single new customer during a given period. It combines every dollar invested in marketing and sales — ad spend, agency fees, salaries of customer-facing staff, tools, and events — then divides by the number of new customers won.
Two variants matter: blended CAC includes fully-loaded sales and marketing headcount costs, giving a true economic picture; paid CAC counts only direct ad spend, useful for measuring campaign efficiency. Both should be tracked together.
Worked example: SaaS startup in Q1
A B2B SaaS company spent $50,000 on paid ads and $80,000 on sales team salaries in Q1. They acquired 260 new customers during the same quarter. Monthly recurring revenue per customer averages $42, and gross margin is 72%.
CAC payback period by CAC and monthly margin
CAC payback period tells you how many months of gross profit it takes to recover the cost of acquiring a customer. A payback under 12 months is considered healthy for most SaaS businesses; under 6 months is strong. E-commerce targets payback within the first order or season.
| CAC | $20 / mo Margin | $50 / mo Margin | $200 / mo Margin |
|---|---|---|---|
| $100 | 5 months | 2 months | < 1 month |
| $300 | 15 months | 6 months | 1.5 months |
| $1,000 | 50 months | 20 months | 5 months |
Source: SaaS benchmarks (David Skok, For Entrepreneurs); months rounded to one decimal
Tips for reducing and benchmarking CAC
CAC is most useful as a trend metric and as one half of the LTV/CAC ratio. A rising CAC is not necessarily bad if LTV is rising faster — the ratio is what matters for unit economics.
- Target LTV/CAC ≥ 3× — below 3× the business is likely destroying value per customer; above 5× may signal under-investment in growth.
- Track CAC by channel separately — blended CAC hides the fact that organic/SEO customers might cost $50 while paid-search customers cost $800; optimise the mix accordingly.
- Include the full sales cycle lag — match marketing spend from the quarter in which leads were generated to customers who closed from those leads, not the close quarter.
- Benchmark against industry norms — SaaS CAC typically runs $200–$500, e-commerce $50–$150, retail $10–$30; materially higher CAC demands a corresponding LTV advantage.
- Invest in onboarding to reduce churn — cutting churn rate extends customer lifetime, raises LTV, and therefore tolerates a higher CAC while preserving healthy unit economics.
Accuracy and limitations
CAC calculations are only as good as the period alignment between spend and new customers. Attribution is rarely perfect — a customer who clicked a paid ad, read three blog posts, and attended a webinar before signing up defies clean single-channel attribution. Blended CAC sidesteps this by treating all spend as a pool, which is conservative and honest.
This calculator is for educational and planning purposes only and does not constitute financial or investment advice. Industry benchmarks vary widely by market segment, deal size, and sales cycle length. Not financial advice — consult a financial advisor or CFO before making headcount or budget decisions based on CAC modeling.
CAC and growth metric terms defined
About this customer acquisition cost calculator
This calculator runs entirely in your browser — nothing you enter is sent to any server.
Browse more in our business calculators, or explore the complete library on the free calculators page.