Should I use customer churn or revenue churn?

Both. Customer churn (this calculator) shows account loss. Revenue churn weights by deal size. If you have wide pricing variance, also track net revenue retention — it can be positive even with negative customer churn via expansion.

My churn is 8% monthly — is that fixable?

Usually yes, but takes 6–12 months. Top fixes: (1) better onboarding to first value, (2) usage-based renewal alerts, (3) cancellation save-flow with offer, (4) interview the last 50 churned for the real "why."

Why is replacement cost so much higher than lost MRR?

Because new customers cost CAC upfront, then take months to reach LTV. Lost MRR is just one month of revenue — replacement cost spans the full year of new acquisitions needed.

CRM Business Hub

Churn Rate Cost Calculator

See what each lost customer really costs you

Free calculator that turns customer count + MRR + churn % into lost MRR, lost ARR and the yearly cost to replace what walked.

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Save hours every week

See the cost of one churned client — or get early-churn signals + auto-trigger save campaigns in Service Manager.

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5% monthly churn looks small. It isn\'t — that\'s 46% annual customer loss. By the end of year 2, you\'ve replaced your entire customer base, and you paid CAC twice for nothing.

This calculator shows you the three numbers that matter: lost MRR per month, lost ARR per year, and what it costs to replace those churned customers at your CAC. Most operators discover it costs more to refill the leaky bucket than to fix the leak.

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Quick — under 90 seconds

How to Use

1 Enter active customers.
2 Enter average MRR per customer.
3 Set monthly churn rate (industry healthy: <2%).
4 Enter average CAC to replace one customer.
5 Read lost MRR, lost ARR and yearly replacement cost.

Benefits

The hidden multiplier — Monthly churn looks small, annual loss is brutal. The calculator shows both.

Replacement cost — Includes the CAC to refill churned customers — usually 2–3x the lost MRR alone.

90-day reality check — Reducing churn by 1pt typically returns more than acquiring 10pt more new customers.

FAQ