Comprehensive Guide
Learn more in our Business & Tax Guide.
How it works
customer acquisition cost calculator takes your inputs and produces customer acquisition cost, ltv to cac ratio, cac payback period (months), unit economics verdict. Calculate exactly what it costs to acquire one new customer — the metric that determines whether growth is profitable or destructive. You provide 3 inputs: Total sales & marketing spend (currency, in dollars) (default: 50000 dollars); New customers acquired (number) (default: 200); Average customer LTV (currency, in dollars) (default: 800 dollars). The calculator returns 4 outputs: Customer acquisition cost (the primary result); LTV to CAC ratio (a secondary output); CAC payback period (months) (a secondary output); Unit economics verdict (a supplementary figure). Business tax and finance calculations combine multiple moving parts — revenue, expenses, depreciation, tax brackets, and timing — in ways that make back-of-envelope estimates unreliable. This calculator handles the interaction of those variables precisely, so your business decisions rest on real arithmetic. The underlying formula: CAC = Total S&M spend ÷ New customers | LTV:CAC ratio = Customer LTV ÷ CAC | Payback period = CAC ÷ Monthly revenue per customer With the default values, customer acquisition cost is computed from the interaction of every input field — change any one of them and the result updates immediately, so you can stress-test different scenarios without re-entering the whole form. Adjust the inputs to match your real financial situation. The defaults are realistic starting points, but every person's circumstances differ — your actual income, expenses, rates, and timelines will produce a different answer. Use the tool iteratively: start with the defaults, then change one variable at a time to see which factor has the largest impact on your outcome.Formula
CAC = Total S&M spend ÷ New customers | LTV:CAC ratio = Customer LTV ÷ CAC | Payback period = CAC ÷ Monthly revenue per customer
Tips
- Include ALL acquisition costs: ad spend, sales salaries, marketing tools, content, events.
- Aim for LTV:CAC of 3:1 or higher. Below 1:1 is unsustainable.
- Track CAC by channel — some channels are far more efficient than others.
- Rising CAC over time is an early warning sign of market saturation or competition.
Frequently asked questions
What is a good customer acquisition cost?
Depends on your LTV. The rule is CAC should be less than 1/3 of customer lifetime value. If LTV is $900, CAC should be under $300. An LTV:CAC ratio of 3:1 or higher is healthy.
How do I reduce customer acquisition cost?
Improve conversion rates (same spend, more customers), shift to lower-cost channels (content marketing, referrals, SEO), target higher-value prospects (better qualification), and improve sales efficiency (shorter sales cycles).
How accurate are the calculator results?
The math is exact — the same formulas a financial professional would use by hand. The precision of the output depends entirely on how realistic your inputs are. Use your actual numbers rather than estimates when possible. The defaults are reasonable starting points, but your real income, rates, and timeline will produce a different result.