Finance tools
Customer acquisition cost (CAC) calculator
Use this free customer acquisition cost calculator to see what you spend in marketing and sales for each new paying customer. Enter marketing spend, sales spend, and new customers for instant CAC, with a live formula card. Switch to Plan budget or Customers affordable to work backward from a target CAC. Under Spend breakdown, itemize ads, salaries, and tools; optionally add LTV:CAC and export CSV or PDF. Customer acquisition cost here means business unit economics — not a coronary artery calcium (CAC) score from cardiology. For ad-level cost per acquisition (CPA), use the CPA calculator. For customer lifetime value, use the CLV calculator.
What is customer acquisition cost (CAC)?
Customer acquisition cost (CAC) is the average amount you spend on marketing and sales to win one new paying customer in a period. The standard formula is CAC = (Marketing costs + Sales costs) ÷ New customers. Teams track CAC alongside LTV, gross margin, and payback to see whether growth spend is sustainable.
CAC is not the same as CPA. In paid media, CPA (cost per acquisition) usually means ad spend ÷ conversions for one campaign. CAC is company-wide: salaries, tools, agencies, and sales and marketing overhead — not just ad spend.
If you search “CAC calculator” without “customer acquisition,” you may see heart calcium scoring tools — this page is for customer acquisition cost in SaaS, e-commerce, and services. The calculator supports three modes, optional line-item spend, segment context, LTV:CAC, and export with no sign-up required.
Calculate CAC
Marketing + sales (+ optional other costs) ÷ new customers — live formula substitution.
Plan budget
Target CAC × new customers → required acquisition spend for the period.
Customers affordable
Total budget ÷ target CAC → how many new customers you can fund at that efficiency.
Itemize spend
Expense rows (ads, salaries, CRM) under Spend breakdown — sums to total acquisition cost.
LTV:CAC + export
Optional lifetime value ratio with health bands; CSV/PDF for board decks and models.
Related finance tools: churn rate calculator, ROAS calculator, burn rate calculator, break-even calculator, and profit margin calculator.
How to calculate customer acquisition cost
Choose period and mode
Pick monthly, quarterly, or annual to match how you report (the selector labels your inputs — it does not convert numbers between periods). Then choose Calculate CAC, Plan budget, or Customers affordable.
Enter acquisition costs
Add marketing and sales totals, or open Spend breakdown to itemize expenses (ads, salaries, tools). Count only net new paying customers acquired in that period — not renewals, expansions, or free-trial signups unless they convert to paid in the same window.
Review CAC and LTV:CAC
Read the CAC hero, spend breakdown, segment benchmark note, and optional LTV:CAC verdict (healthy, watch, or critical). Copy results or export CSV/PDF for finance review.
Example (calculate): $1,000 marketing + $12,000 sales and 1,000 new customers → CAC = $13,000 ÷ 1,000 = $13 per customer.
Example (pre-filled in the calculator): $10,000 marketing + $5,000 sales and 100 new customers → CAC = $150 per customer.
Plan budget: Target CAC $50 × 200 customers → $10,000 in combined marketing and sales spend. Customers affordable: $15,000 budget at $50 target CAC → about 300 new customers.
Customer acquisition cost formula
The core customer acquisition cost formula is:
CAC = (Total marketing costs + Total sales costs + Other acquisition costs) ÷ Number of new customers
In Excel or Google Sheets, if total acquisition spend is in A2 and new customers in B2:
=IF(B2>0, A2/B2, "")
Split buckets in the calculator: put media and marketing programs in marketing spend, SDR/AE and sales tooling in sales spend, and agencies or referral fees in other acquisition costs — or itemize rows under Spend breakdown so totals still reconcile.
Reverse planning: Required budget = Target CAC × New customers or Affordable customers = Total budget ÷ Target CAC — use Plan budget or Customers affordable mode in the calculator.
Include paid media, content, events, marketing salaries, sales salaries and commissions, CRM and sales-enablement tools, and agency fees when they support new customer acquisition. If teams split time between acquisition and retention, include only the acquisition share.
Blended vs channel CAC
Blended CAC uses all-channel totals for one period — best for board reporting and hiring plans. Channel CAC needs attributed spend and attributed new customers per channel; model that in your CRM or warehouse. This tool intentionally solves one blended period at a time so numbers stay auditable.
What costs belong in CAC?
Use the checklist below with your finance team once, then reuse the same rules every month. The calculator’s Spend breakdown rows map cleanly to these buckets.
Include in CAC
Paid ads, SEO/content, events, creative
Marketing & sales salaries, commissions, benefits
CRM, sales-enablement, marketing tools
Agencies, contractors, referral incentives for new logos
Implementation/onboarding required to close (not ongoing CS)
Usually exclude
Customer success for existing accounts
Product R&D and core engineering
General G&A and corporate overhead
Retention marketing to current customers
Expansion/upsell revenue (not new logos)
Who counts as a “new customer”? Use the definition your finance team uses for net new logos or first-time paying accounts. Product-led teams often separate free signups from paid conversions — only count customers that match your CAC denominator.
Consistency matters more than any universal list — document your definition in a short internal memo and use the same rules each month.
LTV:CAC ratio and payback
LTV to CAC ratio (often written LTV:CAC) equals customer lifetime value ÷ CAC. Use gross-profit-based LTV when you can — not revenue alone. Many SaaS teams use 3:1 or higher as a planning rule of thumb, but your margin, churn, and payback window still decide what is healthy for you.
Turn on the optional LTV panel above for a quick ratio and verdict, or model CLV in depth with the customer lifetime value calculator.
CAC payback (how many months until gross profit covers CAC) is explained below but not auto-calculated here. Before you scale spend, sense-check runway with the burn rate calculator.
Healthy (≥ 3:1)
LTV is at least three times CAC on a gross-profit basis. Common planning target; payback and segment mix still matter.
Watch (2:1 – < 3:1)
Acquisition may be tight — improve conversion, pricing, or retention before increasing spend.
Critical (< 2:1)
Often unsustainable at scale — audit channel mix, sales efficiency, and churn with the churn rate calculator.
Payback sanity check: Months to recover CAC ≈ CAC ÷ monthly gross profit per customer. If that stretch is longer than your sales cycle or cash runway, improve margin, retention, or acquisition efficiency before spending more.
CAC vs CPA vs ROAS
These metrics answer different questions. Label them clearly in dashboards — strong campaign CPA can still hide a high company CAC when sales salaries, tools, and long cycles sit downstream.
CAC (company)
Formula: (Marketing + sales + other acquisition cost) ÷ new paying customers.
Use for: unit economics, hiring, board reporting, LTV:CAC.
CPA (campaign)
Formula: Ad spend ÷ conversions (lead, signup, or purchase).
Use for: bid targets, creative tests, channel mix — CPA calculator.
ROAS (campaign)
Formula: Revenue ÷ ad spend.
Use for: revenue efficiency — ROAS calculator.
What is a good customer acquisition cost?
A “good” CAC is relative to LTV, gross margin, and payback — not a single dollar figure. Compare to your trend first; use segment context second.
Simple ceiling check (single-order businesses): Max CAC ≈ AOV × Gross margin % before other operating costs. Subscription businesses should compare CAC to LTV ÷ 3 (or your internal target) rather than industry tables alone.
SaaS / subscription
Often higher CAC and longer sales cycles; judge with LTV:CAC and churn. Select SaaS / subscription in the calculator for benchmark copy.
E-commerce
Often lower CAC per order but must clear COGS, shipping, and returns. Repeat purchase lifts effective LTV — model with the CLV calculator.
Services
Sales-heavy motions can show high CAC — include full sales cost and allocate founder selling time if material.
If CAC rises while conversion rate is flat, audit channel mix, sales cycle length, and discounting before you scale spend.
Limitations
This calculator is for planning and education — not audited financial statements. Confirm exported numbers with finance before investor or board reporting.
One blended period
No per-channel CAC or multi-touch attribution — one total spend and one customer count per run.
No automatic payback
Payback months are not computed in the tool — use the formula in the LTV:CAC section or your finance model.
Period labels are not math
Monthly/quarterly/annual selectors label inputs — you must align spend and customer windows yourself.
Benchmarks are indicative
Segment notes are not industry surveys — compare to your cohorts and CRM data.
This tool focuses on blended CAC for one period, reverse budget and customer planners, itemized spend, and optional LTV:CAC — not multi-channel attribution or audited reporting.
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Frequently asked questions about customer acquisition cost (CAC)
How do you calculate customer acquisition cost?
Customer acquisition cost (CAC) is total acquisition spend divided by new paying customers in the same period: CAC = (Marketing costs + Sales costs) ÷ New customers acquired.
Example: $15,000 combined spend and 100 new customers → CAC = $150 per customer.
What is the customer acquisition cost formula?
The customer acquisition cost formula is CAC = (Marketing + Sales + Other acquisition costs) ÷ New customers. In Excel or Google Sheets: =IF(B2>0, A2/B2, "") when total spend is in A2 and new customers in B2.
Match the period for every input — monthly, quarterly, or annual — before you compare CAC to LTV or benchmarks.
What is a reasonable customer acquisition cost?
Reasonable CAC depends on LTV, gross margin, and payback — not a universal dollar cap. For subscriptions, compare CAC to LTV ÷ 3; for one-off orders, compare to AOV × margin.
Track your own trend month over month before chasing industry tables. Use the business model selector in the calculator for segment context.
What is a good LTV to CAC ratio?
A strong LTV to CAC ratio (same as CLV:CAC) is often 3:1 or higher when LTV is gross-profit-based. 2:1 to below 3:1 is usually a watch band; below 2:1 may be hard to scale profitably.
Model lifetime value with our CLV calculator or turn on the optional LTV panel here — verdict bands match the in-tool callout.
What is the difference between CAC and CPA?
CPA usually means campaign ad spend ÷ conversions. CAC includes broader marketing and sales costs to acquire a paying customer.
Use the CPA calculator for ads; use this tool for company-level CAC.
Should I include salaries in CAC?
Yes for marketing and sales team salaries (and benefits) that work on acquiring new customers. They are often the largest part of CAC in B2B.
Allocate only the portion of time spent on acquisition when teams also handle retention.
What expenses should I include in my CAC calculation?
Include paid advertising, content, SEO, events, marketing and sales salaries (and benefits), commissions, CRM, sales tools, agencies, and referral incentives tied to new logos. Optional other acquisition costs cover items that do not fit marketing or sales buckets.
Exclude customer success for existing accounts and core product R&D unless finance allocates them to acquisition. Use Spend breakdown to itemize rows that sum to your totals.
Is this a coronary calcium (CAC) score calculator?
No. In cardiology, CAC often means coronary artery calcium score from a CT scan — not marketing spend.
This page calculates customer acquisition cost for business, SaaS, and e-commerce.
Can customer acquisition cost be negative?
No. CAC should be zero or positive. Negative CAC would imply you are paid to acquire customers — not a standard reporting case.
If spend is zero with new customers, CAC is $0 (organic-only acquisition).
What happens if I acquired zero new customers?
When new customers = 0, CAC is undefined — the calculator shows a warning instead of dividing by zero.
You may still have acquisition spend; reconcile counts and funnel definitions before publishing CAC to dashboards.
How often should I calculate CAC?
Many teams calculate CAC monthly for tracking and review quarterly for strategy. Recalculate after major channel, pricing, or sales changes.
Segment by channel or customer size in your data warehouse for deeper insight.
How does CAC relate to churn and LTV?
Higher churn lowers lifetime value, so the same CAC buys less gross profit over time. Better retention raises LTV:CAC even when CAC stays flat.
Use the churn rate calculator and CLV calculator together with CAC for full unit economics.
Is this customer acquisition cost calculator free?
Yes — use every mode for free, with optional CSV and PDF export. No sign-up required.
Modes: calculate CAC, plan budget, customers affordable, itemized spend under Spend breakdown, and optional LTV:CAC.