How do I calculate CAC?

Divide your total sales and marketing spend for a period by the number of new customers acquired in that same period. Include fully loaded costs — salaries, commissions, ad spend, tools and agency fees — not just media. For example, $120,000 of quarterly sales and marketing spend that wins 80 new customers gives a CAC of $1,500.

What is a good CAC for SaaS?

There is no universal dollar figure — a good CAC depends on what a customer is worth to you. The standard tests are an LTV:CAC ratio of at least 3:1 and a CAC payback period under 12 months for SMB (up to 18–24 months for enterprise), based on directional 2026 SaaS medians. If CAC exceeds what a customer returns in gross-margin lifetime value, your economics are upside down.

What is the difference between CAC and CPA?

CAC measures the fully loaded cost of acquiring a paying customer, including salaries, tools and overhead across sales and marketing. CPA (cost per acquisition) is a channel-level advertising metric that usually measures cost per lead, trial or conversion from media spend alone. CPA feeds into CAC, but a CPA number is almost always much smaller than true CAC.

What costs should be included in CAC?

Everything spent to win new customers: advertising and media spend, sales and marketing salaries, commissions and bonuses, martech and sales tools, agency and contractor fees, and content or event costs. Leaving out headcount is the most common error and can understate CAC by two to three times. Costs of serving existing customers, like customer success, are excluded.

What is the difference between blended CAC and paid CAC?

Blended CAC divides all sales and marketing spend by all new customers, including those who arrived organically. Paid CAC divides paid-channel spend by customers attributable to those channels only, so it is always higher. Use blended CAC for company-level unit economics and paid CAC to judge whether each acquisition channel deserves more budget.

Is a lower CAC always better?

Not necessarily. A very low CAC paired with a high LTV:CAC ratio (above roughly 5:1) often signals you are underinvesting in growth and leaving market share to competitors. The goal is efficient acquisition at scale — a CAC you can pay back within about 12 months while sustaining growth — not the minimum possible CAC.

SaaS Metrics

CAC Calculator

Customer acquisition cost from sales & marketing spend and new customers won.

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What is customer acquisition cost (CAC)?

Customer acquisition cost (CAC) is the fully loaded sales and marketing cost of winning one new customer. Take everything you spent on acquisition in a period — ad spend, salaries, commissions, tools, agency fees — and divide it by the new customers closed in that same period. CAC is the denominator of SaaS unit economics: LTV:CAC, CAC payback and the magic number are all built on it, so an understated CAC quietly flatters every efficiency metric you report. This CAC calculator is free, needs no sign-up, and runs entirely in your browser.

The CAC formula, explained with a worked example

CAC = (sales spend + marketing spend) ÷ new customers acquired

Say your Q2 looks like this: marketing spent $45,000 (paid ads, content, martech) and sales cost $75,000 (two AEs' salaries plus commissions). Total acquisition spend is $120,000, and you closed 80 new customers in the quarter.

CAC = $120,000 ÷ 80 = $1,500 per customer.

The discipline is in the numerator. If you only count ad spend, you're calculating cost per acquisition (CPA) — a channel metric — not CAC. Fully loaded means every person, tool and program whose job is winning new logos.

What's a good CAC?

There is no universal dollar benchmark. A $1,500 CAC is excellent against a $12,000 ACV and fatal against a $600 one. Operators and investors judge CAC through two ratios instead: how much lifetime value a customer returns per dollar of CAC, and how many months of gross margin it takes to earn the CAC back. Directional 2026 medians:

Efficiency lens	Healthy (directional 2026 median)	Warning sign
LTV:CAC ratio	3:1 or better (medians run ~3–4× by stage)	Below 1.5:1 — upside-down economics
CAC payback	Under 12 months for SMB; 12–18 for later-stage and enterprise	Over 18 months

One counterintuitive note: an LTV:CAC above ~5:1 isn't automatically a win — it often means you're underinvesting in growth. Run your own numbers through the LTV:CAC ratio calculator and the CAC payback calculator, then compare by funding stage on the SaaS benchmarks page.

Common CAC mistakes

Media-only CAC. Leaving out salaries, commissions and tooling can understate CAC by 2–3×. Board decks built on media-only CAC fall apart in diligence.
Mixing blended and paid CAC. Blended CAC (all spend ÷ all new customers, organic included) always looks better than paid CAC. Report blended for unit economics; use paid CAC per channel to decide where the next dollar goes.
Ignoring the sales cycle. With a six-month cycle, this quarter's customers came from last quarter's spend. Lag the numerator or use trailing averages, or ramping spend will make CAC look artificially bad.
Counting non-new customers. Expansions, upgrades and reactivations belong in your retention math, not the CAC denominator.

CAC on its own tells you what a customer costs — pair it with the LTV calculator to see whether that customer is worth it.

See all 2026 SaaS benchmark tables →

Frequently asked questions

Related calculators

LTV:CAC

The LTV:CAC ratio with payback period — is your acquisition efficient enough to scale?

CAC Payback

How many months to recover CAC from gross-margin-adjusted new MRR.

LTV

Customer lifetime value from ARPA, gross margin and churn — the right way, margin-adjusted.

MRR / ARR

Turn plans, seats and billing terms into clean MRR and ARR — including net-new MRR after churn.