Churn & Retention Calculator

Model how retention improvements compound over time.

Result

Customers kept at horizon

150

Cutting monthly churn from 4% to 2.5% keeps 150 more of today's 1,200 customers after 12 months, worth $142,895.68 of extra revenue over that span. New customers are not modelled.

Improved churn rate

2.50%

Customers left, current churn

735

Customers left, improved churn

886

Cumulative revenue lift

$142,896

Customers left after 12 months

Of 1,200 customers today, with no new sign-ups.

Today

1,200

Current churn (4%)

735

Improved churn (2.5%)

886

General business information, not legal, tax or financial advice. The result comes only from your inputs and the published method. How we check our numbers.

How to use it

Enter active customers, current monthly churn, the churn reduction in percentage points, monthly ARPU, and the planning horizon. Even a 1-point monthly churn improvement can compound into a large revenue difference over 12 months or more.
Read the customers kept at the horizon, the improved churn rate, customers left under current and improved churn, and the cumulative revenue lift. The longer the horizon, the more that a small monthly churn change compounds into a meaningful retention outcome.
Use the cumulative revenue lift to judge whether retention work beats acquisition work. If a 1-point churn improvement produces more revenue than your next paid acquisition campaign, the retention project likely deserves priority.
Turn the model into concrete action by mapping the lift to onboarding fixes, support response targets, save offers, or product reliability work. Then segment the math by plan or cohort because enterprise and SMB churn rarely behave the same way.
Re-run monthly by segment and compare modeled lift to actual churn improvements. Track both ending customer counts and revenue lift so retention efforts are measured against cash impact, not just percentage slogans.

Questions people usually ask

Why do small retention improvements matter so much?

Because retention compounds. Saving even a small slice of customers or revenue every month can create a much bigger lift over a year than teams expect.

What is the difference between churn and retention?

They are opposite views of the same thing. Churn measures what you lose. Retention measures what you keep.

Should I look at customer churn or revenue churn?

Both can matter. Customer churn shows logo loss, while revenue churn shows how much money is walking out the door.

Can this help me prioritize a retention project?

Yes. It helps you see whether the likely lift is big enough to justify the work before you commit team time or budget.

Is this tool free and private to use?

Yes. AI Biz Hub tools are free, no-signup browser tools. Inputs stay in your browser unless you choose to share a URL.

Is this professional advice?

No. Outputs are business planning estimates — not legal, tax, or accounting advice.

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Background on the Churn & Retention Calculator

Formula Churn Rate Formula: How to Calculate It
The churn rate formula: customers lost divided by starting customers, times 100. See the calculation, variables, a worked SaaS example, and variations.
Formula CAC Formula: How to Calculate Customer Acquisition Cost
The CAC formula divides sales and marketing spend by new customers. See how to calculate customer acquisition cost, with a worked example and variations.
Formula Business Valuation Formula (Earnings x Multiple)
The business valuation formula multiplies normalized earnings (SDE or EBITDA) by an industry multiple. See how to set the multiple and bracket the value range.
Formula Customer Lifetime Value (LTV) Formula
The customer lifetime value formula multiplies average purchase value, frequency, and lifespan. Learn to calculate LTV and pressure-test it against churn.
Formula NPS Formula
Uncover customer loyalty insights with the NPS formula. Learn to calculate your Net Promoter Score, understand its variables, and boost your SaaS growth.
Examples Churn Retention Examples
Explore practical churn retention examples across SaaS, subscription, and freemium models. Understand how different metrics reveal growth opportunities.

All resources for this calculator (18)

7 min read How to Reduce Customer Churn
How to Reduce Customer Churn: diagnose involuntary versus voluntary churn, fix the payment-failure bucket first, and run targeted save offers only where they.
8 min read How to Build a Retention Playbook
Build a retention playbook around net revenue retention, early warning signals, and targeted interventions, with the metrics that predict churn.
9 min read Free-to-Paid Target for $15k MRR: A Solo Founder Plan
Free-trial-to-paid target for $15k MRR: solve backwards for trial signups, paid conversion, churn, and ARPU. Find the input you can move this quarter.

All articles

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Use it from code

The same calculation as a JavaScript module you can import. It runs where you import it, with no request, key or rate limit.

import { compute } from "https://aibizhub.io/engines/churn-retention-calculator.js";

Input and output contract, TypeScript types and the guide for agents.