SaaS Unit Economics Calculator: MRR, ARR, Churn, Gross LTV & CAC Payback

Month	Active Customers	MRR	ARR Run-Rate	Cumulative Cash
M1	154	$7,522	$90,270	$7,522
M2	167	$8,164	$97,965	$15,686
M3	179	$8,785	$105,414	$24,471
M4	192	$9,385	$112,625	$33,856
M5	203	$9,967	$119,605	$43,823
M6	215	$10,530	$126,362	$54,353
M7	226	$11,075	$132,902	$65,429
M8	237	$11,603	$139,233	$77,031
M9	247	$12,113	$145,362	$89,145
M10	257	$12,608	$151,294	$101,753
M11	267	$13,086	$157,037	$114,839
M12	277	$13,550	$162,596	$128,389
M13	286	$13,998	$167,977	$142,387
M14	295	$14,432	$173,185	$156,819
M15	303	$14,852	$178,227	$171,671
M16	311	$15,259	$183,108	$186,930
M17	319	$15,653	$187,833	$202,583
M18	327	$16,034	$192,406	$218,617
M19	335	$16,403	$196,833	$235,019
M20	342	$16,760	$201,118	$251,779
M21	349	$17,106	$205,267	$268,885
M22	356	$17,440	$209,282	$286,325
M23	363	$17,764	$213,169	$304,089
M24	369	$18,078	$216,932	$322,167

Month

Active Customers

MRR

ARR Run-Rate

Cumulative Cash

154

$7,522

$90,270

$7,522

167

$8,164

$97,965

$15,686

179

$8,785

$105,414

$24,471

192

$9,385

$112,625

$33,856

203

$9,967

$119,605

$43,823

215

$10,530

$126,362

$54,353

226

$11,075

$132,902

$65,429

237

$11,603

$139,233

$77,031

247

$12,113

$145,362

$89,145

M10

257

$12,608

$151,294

$101,753

M11

267

$13,086

$157,037

$114,839

M12

277

$13,550

$162,596

$128,389

M13

286

$13,998

$167,977

$142,387

M14

295

$14,432

$173,185

$156,819

M15

303

$14,852

$178,227

$171,671

M16

311

$15,259

$183,108

$186,930

M17

319

$15,653

$187,833

$202,583

M18

327

$16,034

$192,406

$218,617

M19

335

$16,403

$196,833

$235,019

M20

342

$16,760

$201,118

$251,779

M21

349

$17,106

$205,267

$268,885

M22

356

$17,440

$209,282

$286,325

M23

363

$17,764

$213,169

$304,089

M24

369

$18,078

$216,932

$322,167

How It Works Under the Hood

Evaluates gross-margin adjusted Lifetime Value ((ARPU × Gross Margin %) / Monthly Churn), CAC Payback months, LTV:CAC health tiers (<1x, 1–3x, 3–5x, 5x+), and month-by-month churn vs. new-customer compounding.

Step-by-Step Instructions

Enter active customer count, monthly ARPU, logo churn %, gross margin %, and CAC.

Adjust monthly new customer velocity to see MRR & ARR growth curves over 12–36 months.

Check LTV:CAC health status and export the full monthly projection to CSV.

Key Features & Performance

True Gross-Margin LTV: Prevents inflated LTV numbers by factoring gross margin % properly
Investor Benchmark Rating: Instant Danger / Needs Work / Healthy / Strong scoring on LTV:CAC
CAC Payback Period: Know exactly how many billing months it takes to recover ad spend
12/24/36-Month Forecast CSV: Ready for pitch decks and investor updates

Local Browser Processing & Privacy

Traditional web converters upload your documents, snippets, or media files to remote servers. SaaS Metrics Calculator (MRR, LTV & CAC Payback) runs inside your browser tab:

Processed in This Tab

Your input text and files are processed locally without uploading payloads to a processing server.

No Tool Payload Logging

Microdeck does not log or store the files or inputs you paste into tool workspaces (normal static hosting/CDN requests still load page assets).

Tab Memory Lifecycle

Working outputs stay in your browser tab and are released when you reset the tool or close the tab.

Frequently Asked Questions

Why does LTV:CAC use gross margin instead of raw revenue?

Investor-grade SaaS accounting subtracts hosting, support, and payment fees (via Gross Margin %) so you do not overestimate how much cash is actually available to pay back CAC.

What is considered a healthy LTV:CAC ratio?

Most B2B and SaaS benchmarks target 3:1 or higher with a CAC payback period under 12 months.

SaaS Metrics Calculator (MRR, LTV & CAC Payback)

How It Works Under the Hood

Step-by-Step Instructions

Key Features & Performance

Local Browser Processing & Privacy

Frequently Asked Questions

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