SaaS Unit Economics Calculator: MRR, ARR, CLTV, CAC & Churn

TL;DR: This free SaaS unit economics calculator works out the five metrics that decide whether your growth is fundable: MRR, ARR, customer lifetime value (CLTV), customer acquisition cost (CAC), and churn rate. Enter your numbers for instant results, with formulas, worked examples, and benchmarks below.

Key takeaways

• Five free calculators on one page: MRR, ARR, CLTV, CAC, and churn rate.
• Every metric includes its formula, a worked example, and a healthy-range benchmark.
• Unit economics tell you whether each new customer makes or loses you money, before growth hides the answer.
• The most common error in SaaS unit economics: a CAC that excludes or misallocates sales commissions.

Growth tells you how fast you are scaling. Unit economics tell you whether you should. A SaaS business that spends more to acquire customers than those customers return does not have a growth problem, it has a funding countdown.

Most teams do not get these numbers wrong because the formulas are hard. They get them wrong because the inputs live in different places: revenue in billing, spend in accounting, commissions in a spreadsheet, churn in the CRM. Five sources, five definitions, one unreliable board slide.

This page puts the five core calculations in one place, with the formulas and benchmarks to sanity-check the outputs. Use it before a fundraise, a pricing change, or a sales hiring plan.

What are SaaS unit economics?

SaaS unit economics measure profitability at the per-customer level. Instead of asking "is the company profitable," they ask "does each new customer create more value than they cost to acquire and serve." Five metrics answer that question.

MRR Calculator (Monthly Recurring Revenue)

MRR is your predictable subscription revenue per month, the baseline metric every other SaaS number builds on. This monthly recurring revenue calculator multiplies paying customers by average revenue per user.

Formula: MRR = paying customers × monthly ARPU

Worked example: 200 customers × $350 ARPU = $70,000 MRR.

Count only recurring revenue. One-time fees, implementation charges, and credits do not belong in MRR, and including them is the fastest way to overstate growth. Mature teams also split MRR into new, expansion, contraction, and churned movements, because flat headline MRR can hide an expansion engine or a leaky bucket.

ARR Calculator (Annual Recurring Revenue)

ARR is MRR annualized, the number investors quote and benchmark against. This annual recurring revenue calculator converts MRR to ARR instantly.

Formula: ARR = MRR × 12

Worked example: $70,000 MRR × 12 = $840,000 ARR.

ARR is not run-rate revenue. ARR includes only committed recurring revenue; run rate annualizes everything you billed last month, one-offs included. Quoting run rate as ARR is the kind of inflation diligence teams catch in an afternoon, so decide which number you report and hold the definition.

CLTV Calculator (Customer Lifetime Value)

Customer lifetime value, written as CLTV, CLV, or LTV, is the gross profit a customer returns before they churn. This customer lifetime value calculator uses the margin-adjusted formula, which is the one that should inform spend decisions.

Formula: CLTV = (monthly ARPU × gross margin %) ÷ monthly churn rate

Worked example: ($350 ARPU × 80% margin) ÷ 2% monthly churn = $14,000 CLTV.

Two things most teams miss. First, use gross margin, not revenue: a $14,000 revenue lifetime at 60% margin is a very different business than at 85%. Second, churn moves CLTV faster than pricing does. Cutting monthly churn from 2% to 1% doubles lifetime value; raising ARPU 10% adds 10%. Retention work compounds.

CAC Calculator (Customer Acquisition Cost)

CAC is the fully loaded cost of winning one new customer. This customer acquisition cost calculator divides total sales and marketing spend by new customers acquired in the same period.

Formula: CAC = (program spend + S&M salaries + sales commissions + tooling) ÷ new customers

Worked example: ($60,000 program spend + $40,000 S&M compensation) ÷ 25 new customers = $4,000 CAC.

"Fully loaded" is where most CACs quietly break. Program spend gets counted because it sits in one budget line. Compensation, and especially sales commissions, often does not, because it lives in payroll exports and commission spreadsheets. Commissions are usually the largest variable cost in sales and marketing, so a CAC that excludes them is not conservative, it is wrong, and every downstream number (CAC payback, LTV:CAC, hiring plans) inherits the error.

Churn Rate Calculator

Churn rate is the share of customers you lost in a period. This churn calculator uses starting customers, ending customers, and new additions, so growth cannot mask losses.

Formula: churn rate = customers lost ÷ customers at start of period

Worked example: Start with 400 customers, add 16, end with 396. You lost 20, so churn = 20 ÷ 400 = 5%.

Track logo churn (customers lost) and revenue churn (MRR lost) separately. Losing five small accounts and losing one enterprise account can be the same logo churn and wildly different revenue churn. If your revenue churn is consistently worse than logo churn, your largest customers are the ones leaving, and that is a product or success problem, not a sales problem.

What are healthy benchmarks for SaaS unit economics?

Benchmarks vary by segment and contract size, but these ranges are the commonly used screens.

Treat these as screens, not verdicts. A 2.5:1 LTV:CAC with falling churn is a better business than a 3.5:1 with rising churn.

Why do unit economics calculations go wrong?

Three failure modes show up repeatedly in SaaS finance reviews.

Inconsistent definitions. Marketing computes CAC on program spend, Finance computes it fully loaded, and the board sees whichever number the deck used last quarter. Pick one definition and write it down.

Commissions are missing from CAC. Sales commissions are usually the largest variable cost in sales and marketing, and the least instrumented. When commission data lives in spreadsheets, CAC and CAC payback are estimates, not measurements. What starts as a tracking gap becomes a mispriced growth plan.

ASC 606 changes the timing. Under ASC 606, commissions on new contracts are capitalized and amortized, so the CAC your P&L shows is not the CAC your cash paid. Teams that ignore this report different unit economics to auditors and investors without realizing it.

This is where unit economics stop being a calculator problem. Visdum gives Finance and RevOps teams accurate, audit-ready commission data, including ASC 606 amortization, so CAC and payback are measured rather than guessed. If commissions are the soft spot in your numbers, see how Visdum works.

Who is this SaaS calculator for?

• Founders pressure-testing unit economics before a fundraise
• CFOs, controllers, and FP&A teams standardizing metric definitions
• RevOps leaders sizing sales capacity and quota plans
• Investors and operators running a quick screen on a SaaS P&L

FAQs

What is a good LTV to CAC ratio?
‍3:1 or higher is the standard screen. Below 2:1, acquisition spend is destroying value. Far above 5:1 can mean you are underinvesting in growth.

Does CAC include salaries and commissions?
‍Yes. Fully loaded CAC includes program spend, tooling, salaries, and sales commissions. Excluding compensation is the most common way CAC gets understated.

Is CLTV the same as LTV and CLV?
‍Yes, the three abbreviations refer to the same metric: customer lifetime value. Use the margin-adjusted formula for spend decisions.

What is the difference between MRR and ARR?
‍ARR is MRR × 12. Report ARR for annual-contract businesses and fundraising, MRR for month-to-month operations. Never mix run-rate revenue into either.

What churn rate is acceptable for SaaS?
‍Under 1 to 2% monthly logo churn for mid-market and enterprise. Sustained churn above 3% monthly undermines any CAC math.

How often should I recalculate unit economics?
‍Monthly, as part of close. Quarterly is the minimum if your sales cycle is long.

Is this SaaS unit economics calculator free?
‍Yes. All five calculators on this page are free to use, no signup required.

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