Kairos Microtools

Subscription Churn Revenue Calculator

See what churn really costs your SaaS — and what fixing it is worth. Free, no signup.

Early-stage Growth Mature ↺ Reset

Current MRR (USD)

Paying Customers

Monthly Churn Rate (%)

Target Churn Rate (%)

Advanced options CAC not tracked · $

These values are used in the calculation. Leave CAC blank or 0 if you do not track it.

CAC per Customer (USD, optional)

Currency label

Monthly Revenue Lost

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MRR after 12 months (no new sales)

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Customers Lost / Month

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Net Revenue Retention (12mo)

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New Customers / Mo just to hold flat

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Annualised revenue-loss reduction

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Monthly revenue-loss difference × 12. Assumes a constant MRR base; not a 12-month revenue forecast.

Why track churn revenue

Churn is a leak, not a cost. It compounds monthly — 5% looks small until you see the 12-month hole.

Fixing beats buying. Retaining a customer is usually cheaper than replacing one via ads.

No spreadsheet. Enter MRR and churn; see the real number in one view.

The free calculator shows one scenario. The Suite models the rest:

12-month forecast spreadsheet — churn modelled at 2% / 5% / 8% / 12% side by side
"Fix churn" vs "buy ads" ROI — what retaining a customer costs against replacing one
Retention tracker — log each initiative and the MRR it actually saved

Instant download: Excel workbook + 12-playbook PDF. Pay once, yours forever.

Base price: US$9. Local currency and applicable taxes are shown at checkout.
Free calculator stays free. No subscription, no login.

Is this free?

Yes — the single-scenario calculator is free and needs no signup. The Suite is a one-time $9 upgrade.

Does it predict my revenue?

No. It does the math from the numbers you enter. It is not financial advice.

Who is it for?

SaaS and subscription founders who want to quantify churn's revenue impact without a BI tool.

What does the Suite add?

An Excel workbook — a 12-month forecast at four churn rates, a fix-vs-buy ROI comparison, and a retention tracker — plus a 12-playbook PDF.