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SaaS Churn Calculator

Calculate customer churn, revenue churn, net revenue churn, retained customers, and retained MRR.

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Inputs

$
$

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Results

Customer Churn Rate
Gross Revenue Churn5.00%
Net Revenue Churn-2.00%
Retained Customers960

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Assumptions

  • Rates are user-entered planning assumptions.
  • The estimate does not replace accounting, tax, payroll, legal, or marketplace-specific guidance.
  • Inputs are processed locally in the browser.

Sensitivity preview

Starting Customers -10%: Customer Churn Rate 4.44%

Starting Customers Current: Customer Churn Rate 4.00%

Starting Customers +10%: Customer Churn Rate 3.64%

Formula: Customer churn = lost customers / starting customers. Gross revenue churn = churned MRR / starting MRR. Net revenue churn = (churned MRR - expansion MRR) / starting MRR.

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About this SaaS Churn Calculator

SaaS churn measures customer and revenue loss. Net revenue churn also accounts for expansion from retained customers.

Who this calculator is for

  • Freelancers, founders, consultants, and small business operators.
  • Bookkeepers and finance teams doing quick planning checks.
  • Anyone comparing pricing, tax, payment, or marketplace assumptions.

When to use it

  • Model a planning scenario before changing pricing or workflow.
  • Compare best-case and conservative assumptions.
  • Turn business inputs into a transparent estimate.

How to use this calculator

  1. Enter your current or planned business assumptions.
  2. Adjust rates and fees to match your situation or provider.
  3. Review the primary result and supporting breakdown.

Key assumptions

  • Rates are user-entered planning assumptions.
  • The estimate does not replace accounting, tax, payroll, legal, or marketplace-specific guidance.
  • Inputs are processed locally in the browser.

Accuracy and testing

Review formula sources, default test cases, assumptions, unit handling, rounding rules, and changelog for this calculator.

View accuracy page

How this calculator works

Customer churn = lost customers / starting customers. Gross revenue churn = churned MRR / starting MRR. Net revenue churn = (churned MRR - expansion MRR) / starting MRR.
Customer churn = lost customers / starting customers. Gross revenue churn = churned MRR / starting MRR. Net revenue churn = (churned MRR - expansion MRR) / starting MRR.

Inputs explained

Revenue and volume

The sale, customer, invoice, or workload amount being modeled.

Rates and fees

Editable percentages, flat fees, or tax rates used in the estimate.

Costs

Direct expenses, platform fees, labor, support, or other assumptions that reduce profit or take-home pay.

Understanding your results

Lower churn is better. Negative net revenue churn means expansion from retained customers more than offsets churned revenue.

Example scenarios

Planning example

1,000 starting customers, 40 lost customers, $100,000 starting MRR, $5,000 churned MRR, and $7,000 expansion MRR creates negative net revenue churn.

Key Features

  • Instant Calculation
  • Private & Secure
  • Mobile Optimized

Tips & Best Practices

  • Run a conservative scenario before making pricing decisions.
  • Use current payment processor or marketplace fee schedules when applicable.
  • Revisit assumptions when costs, volume, or tax rates change.

Frequently Asked Questions

What is negative net revenue churn?
It means expansion revenue from existing customers exceeds revenue lost to churn.
Is my business data stored?
No. The calculator runs locally in your browser and does not upload your inputs.