Step-by-Step Guide

How to Calculate Customer Acquisition Cost (CAC)

Five steps to calculate CAC accurately using fully-loaded costs. Formulas, channel segmentation, and practical benchmarks for product managers.

1
Define Your Time Period

Pick a consistent measurement window before you touch any numbers. Monthly, quarterly, and annual calculations each serve different purposes. Mixing them produces misleading comparisons.

›Monthly CAC is ideal for fast-moving, high-volume acquisition channels like paid ads where spend and results are tightly coupled.
›Quarterly CAC smooths out seasonal spikes and is better suited for teams with longer sales cycles or content-driven acquisition.
›Annual CAC is useful for board reporting and long-range financial planning, capturing the full picture of your go-to-market investment.
›Use the same reporting period for costs and customers. If sales cycles are long, also examine the delay between acquisition spend and the customers it brings in.
›Example: For a Q1 period calculation, use sales and marketing spend from January 1 to March 31 and customers acquired during that quarter.

Formula

Time Period: Month, Quarter, or Year; use one consistent window

Pro tip: Use a rolling 3-month average for more stable CAC readings. Seasonal campaigns and hiring spikes can make any single month an outlier. Smoothing helps you spot real trends versus noise.

2
Sum All Sales and Marketing Expenses

Fully loaded CAC includes the sales and marketing costs attributable to acquiring new customers, including salaries, tools, and overhead. Ad spend alone gives a narrower measure.

›Salaries and benefits: Include the full cost of everyone in sales (AEs, SDRs, BDRs) and marketing (growth, content, design, demand gen).
›Paid advertising: All spend across Google, Meta, LinkedIn, programmatic, and any other paid channels.
›Tools and software: CRM (Salesforce, HubSpot), marketing automation (Marketo, Klaviyo), sales engagement tools, ABM platforms.
›Content and creative: Agency fees, freelancer costs, video production, design assets used for acquisition.
›Events and conferences: Booth fees, travel, sponsorships, hosted events. Include the portion attributable to new customer acquisition.
›Example: $40,000 in salaries + $15,000 in ad spend + $3,000 in tools + $2,000 in events = $60,000 total sales and marketing spend.

Formula

Total S&M Spend = Salaries + Ads + Tools + Content + Events + Overhead

Pro tip: If your sales and marketing team also handles retention and expansion, allocate costs using the acquisition-focused portion of the work. Document your assumptions and apply them consistently.

3
Count New Customers Acquired

Counting new customers sounds straightforward but needs clear definitions. Ambiguity here makes CAC look artificially low or high depending on how you count.

›Count first-time paying customers acquired during the period. Do not subtract churned customers from this count.
›Do not include reactivations (churned customers who returned) unless your strategy deliberately targets win-backs.
›Do not include expansions or upsells of existing accounts. Those are handled separately in NRR calculations.
›For freemium businesses, count the moment a free user converts to a paid account.
›For enterprise with complex POCs or pilots, count the date the contract is signed, not when the opportunity was created.
›Example: In Q1, 60 new companies signed their first paid contract. New customers acquired = 60.

Formula

New Customers = First-Time Paying Accounts Acquired in the Period

Pro tip: Align your definition of "new customer" with your CRM data before calculating. Audit a sample of 10-20 records quarterly to check whether that definition is applied consistently.

4
Divide Total Costs by New Customers

Apply the CAC formula using your verified inputs to calculate the average cost of acquiring a new customer.

›Divide your total sales and marketing spend by the number of new customers acquired in the same period.
›Example: $60,000 total S&M spend / 60 new customers = $1,000 blended CAC.
›This blended CAC is your starting point. It tells you the average cost but masks efficiency differences between channels.
›A CAC of $1,000 and gross-profit LTV of $3,000 gives a 3:1 ratio. Bessemer uses 3x or more as an investment guideline for cloud companies, not a guarantee of business health.
›A ratio below 1:1 means estimated lifetime gross profit is below acquisition cost. Check the inputs and assumptions before deciding how to respond.

Formula

CAC = Total Sales & Marketing Spend / Number of New Customers Acquired

Pro tip: Review LTV:CAC alongside payback, cash needs, and retention. A high ratio alone does not show that additional acquisition spend will produce the same return.

5
Segment by Channel for Deeper Insights

Use blended CAC for an overall view and channel-specific CAC to compare acquisition efficiency. Channels that contribute similar amounts to the blended figure can still differ in cost per customer.

›Paid search CAC: Divide total Google/Bing ad spend plus the portion of the team managing those campaigns by customers attributed to paid search.
›Organic/SEO CAC: Divide content, SEO tools, and writer costs by customers attributed to organic search.
›Referral/word-of-mouth CAC: Divide referral program costs by customers attributed to referrals. Bonuses below LTV can support a positive return, but they do not make CAC negative.
›Outbound/SDR CAC: Divide SDR salaries, tools (Outreach, Apollo), and data costs by pipeline sourced from outbound that converted.
›Example: Paid CAC = $2,500, Organic CAC = $400, Referral CAC = $150. Compare customer value, payback, and each channel’s capacity before shifting budget.

Formula

Channel CAC = Channel-Specific S&M Spend / New Customers from That Channel

Pro tip: Use UTM parameters and CRM source tracking consistently, and document how you assign customers who encounter multiple channels. Compare fully loaded costs using the same attribution method.

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Frequently Asked Questions

What is a good Customer Acquisition Cost?

Evaluate CAC against gross-profit LTV, payback, and available cash. Bessemer’s cloud-company guidance uses LTV:CAC of 3x or more as a reason to consider acquisition investment. Absolute CAC varies with pricing and the sales model.

How is CAC different from CPA (Cost Per Acquisition)?

CAC measures the cost to acquire a paying customer. CPA (Cost Per Acquisition) is a broader marketing metric that can refer to any conversion action: a lead, a sign-up, a trial, or an app install. CAC is strictly about paying customers. Use CPA for channel-level optimization and funnel analysis, and CAC for unit economics and financial planning.

Should I include product and engineering costs in CAC?

For a product-led growth (PLG) company, some argue that product costs should be included since the product itself is the primary acquisition channel. In practice, most companies exclude product and engineering from CAC to keep it comparable to industry benchmarks, which follow the traditional S&M-only definition. If you include product costs, document this clearly and never compare your CAC against benchmarks that use the narrower definition.

How often should I recalculate CAC?

Recalculate CAC monthly for fast-moving growth teams and quarterly for more stable businesses. Always recalculate after major changes: a new paid channel launch, a significant headcount change in sales or marketing, or a pricing model update. A rising CAC over 3-4 consecutive months is an early warning that warrants review.

What is the payback period and how does it relate to CAC?

Payback estimates the months needed to recover CAC from customer gross profit: CAC / (monthly ARPU x gross margin). A $1,000 CAC and $100 monthly gross profit gives 10 months. Bessemer’s cloud-company guidance targets under 12 months for SMB, 18 for mid-market, and 24 for enterprise. These are planning guidelines; assess your own cash needs and retention.

Sources

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