Cohort Retention Calculator — M1 / M3 / M6 / M12 Survival

Free cohort retention calculator. Enter cohort size + survivors at M1/M3/M6/M12 — get retention % at each milestone. Targets: M12 ≥ 40% SMB, ≥ 80% enterprise.

Cohort Retention Calculator

Track how many customers from your starting cohort remain active at each milestone.

Month 0 (cohort)

Month 1

Month 3

Month 6

Month 12

M1 retention

80.0%

M3 retention

65.0%

M6 retention

52.0%

M12 retention

40.0%

The retention curve flattens after the first few months — if you're still bleeding customers at month 6+, you don't have product-market fit. The M12 number is what determines LTV. SaaS targets: M12 ≥ 40% for SMB, ≥ 80% for enterprise.

About this tool

The retention curve flattens — eventually

If you're still bleeding customers at month 6+, you don't have product-market fit yet. The M12 retention number is what determines LTV. SaaS targets: M12 ≥ 40% for SMB, ≥ 80% for enterprise.

How to use the Cohort Retention Calculator

Takes about a minute. No signup, no download, your data stays in your browser.

1
Open the tool. Scroll up to the Cohort Retention Calculator above — it loads instantly in your browser, no install needed.
2
Enter your values. The fields come pre-filled with realistic defaults so you can see how it works — replace them with your own numbers.
3
Read the result. The output updates instantly. Copy or share it — nothing is uploaded to a server, everything stays on your device.

Frequently asked questions

Common questions about the Cohort Retention Calculator.

Is the Cohort Retention Calculator free to use?

Yes. The Cohort Retention Calculatoron 7BusyBoss is completely free — no signup, no paywall, no usage cap.

Do I need to sign up to use the Cohort Retention Calculator?

No. The Cohort Retention Calculatorworks instantly in your browser — no account needed. Signing in with Google is optional and only unlocks features like saving favorites and higher AI build limits.

Does the Cohort Retention Calculator work on mobile?

Yes. Every tool on 7BusyBoss is mobile-responsive and works in any modern browser — Chrome, Safari, Firefox, Edge — on phones, tablets and desktops.

Is my data safe when I use the Cohort Retention Calculator?

Yes. The Cohort Retention Calculatorruns entirely in your browser — your inputs never leave your device unless the tool explicitly fetches public data (e.g. currency rates). We don't store the values you type.

Cohort Retention Calculator — M1 / M3 / M6 / M12 Survival