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Customer Acquisition Cost Calculator

Calculate how much it costs to acquire one new customer from your sales and marketing spend — with blended, marketing-only and sales-only CAC, plus practical ways to bring it down.

Written and reviewed by the CalcBundle editorial team. Transparent formulas · results are estimates, not advice.

Marketing costs
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Sales & customers
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Customer acquisition cost

Enter the number of new customers acquired (greater than zero).

How to reduce CAC

Lower CAC is not always better — weigh it against customer quality and lifetime value.

  • Improve your conversion rate so more traffic becomes customers.
  • Sharpen targeting to reach higher-intent audiences.
  • Grow organic and referral acquisition to dilute paid costs.
  • Improve retention — loyal customers refer and repurchase.
  • Optimize the sales funnel to cut drop-off and wasted spend.
  • Reallocate budget away from underperforming channels.

What is a CAC calculator?

A CAC (customer acquisition cost) calculator works out the average amount you spend to win one new customer. It is one of the most important numbers in any business — especially startups and SaaS — because it tells you whether growth is efficient and sustainable.

How is CAC calculated?

The formula is simple:

  • CAC = Total sales & marketing acquisition costs ÷ New customers acquired

This calculator also splits out marketing CAC and sales CAC, and reports the blended CAC across both, so you can see where acquisition cost is concentrated.

What costs should you include?

Include all the money that goes into acquiring customers over the period: advertising, marketing tools and salaries, agency fees, sales salaries and commissions, and acquisition software. Keep the definition consistent from period to period so comparisons are fair.

CAC vs CPA

CPA (cost per acquisition) typically measures the cost of a single action — a lead, a trial or a signup. CAC measures the cost of a paying customer. A funnel can have a low CPA on leads but a high CAC if few leads convert to customers.

Example

If you spend $12,000 on marketing and $8,000 on sales in a month and acquire 400 customers, your total acquisition cost is $20,000 and your CAC is $50 per customer.

How to reduce CAC

The biggest levers are conversion rate, targeting, organic and referral acquisition, retention, and cutting wasted ad spend. But remember: a lower CAC is only good if it does not come at the expense of customer quality. Always weigh CAC against lifetime value, the LTV:CAC ratio and your CAC payback period.

Frequently asked questions

What is CAC (customer acquisition cost)?

CAC is the average cost to acquire one new customer. You calculate it by dividing your total sales and marketing acquisition costs over a period by the number of new customers acquired in that period.

How is CAC calculated?

CAC = total sales & marketing acquisition costs ÷ new customers acquired. For example, $20,000 of spend that brings 400 customers is a CAC of $50.

What costs should be included in CAC?

Include everything spent to win customers: advertising, marketing salaries and tools, sales salaries and commissions, agency fees, and software used for acquisition. Be consistent about what you include so you can compare periods.

What is the difference between CAC and CPA?

CPA (cost per acquisition) usually refers to the cost of a single conversion action such as a lead or signup, while CAC refers specifically to the cost of acquiring a paying customer. CAC is the broader, business-level metric.

Is a lower CAC always better?

Not necessarily. A very low CAC can come from low-quality customers who churn quickly. Always read CAC alongside customer lifetime value (LTV) and payback period — cheap customers who leave fast can be worse than more expensive, loyal ones.

Related calculators

LTV

Estimate a customer's lifetime value from order value, frequency and lifespan — or churn.

LTV:CAC Ratio

Compare lifetime value to acquisition cost and interpret the ratio.

CAC Payback Period

See how long it takes to recover CAC from a customer's gross profit.

Business Profit

Turn revenue and expenses into gross, operating and net profit with clear margins and a visual breakdown.

E-commerce Profit

Calculate net profit, margin, break-even price and maximum ad spend for a product.

Disclaimer. This calculator provides estimates for informational purposes only. Results are based on the information you enter and the assumptions used by the calculator. Actual financial, tax, business valuation, lending, marketplace or investment outcomes may differ. Consider consulting a qualified professional for decisions involving significant amounts of money. Results are estimates based on the assumptions you provide. Actual customer acquisition costs can vary.