SaaS MRR Growth and Churn Calculator

How to use this saas mrr growth and churn calculator

1. Starting monthly recurring revenue: enter the amount in your selected currency. The worked example uses $10,000.00.
2. New MRR added each month: enter the amount in your selected currency. The worked example uses $1,500.00.
3. Expansion MRR each month: enter the amount in your selected currency. The worked example uses $200.00.
4. Monthly revenue churn: enter a percentage using 5 to mean 5%. The worked example uses 3%.
5. Projection months: enter the quantity in months. The worked example uses 12 months.

Start with figures from the same statement date or planning period. Calculate once, save scenario A, then change one assumption to understand its effect. The comparison shows B minus A; a positive difference means the result increased, which is not automatically better.

Formula and calculation method

MRR next month = MRR this month × (1 − churn) + new MRR + expansion MRR.

The calculator evaluates this relationship directly in your browser. The displayed precision is for readability and does not imply a guaranteed outcome. Time periods and rate conventions matter: use the exact units in each input label and avoid mixing monthly and annual values.

What the result means

The annual run rate is twelve times the ending MRR, not revenue already earned. The model applies churn to opening MRR, then adds new and expansion MRR at each month boundary.

Two worked examples

1. Illustrative planning scenario

Starting monthly recurring revenue = $10,000.00; New MRR added each month = $1,500.00; Expansion MRR each month = $200.00; Monthly revenue churn = 3%; Projection months = 12 months.

Apply the stated formula with these inputs. Monetary examples use USD; percentages are divided by 100 inside the calculation. Intermediate calculations retain full precision and displayed amounts are rounded.

2. Simplified calculation check

Starting monthly recurring revenue = $1,000.00; New MRR added each month = $100.00; Expansion MRR each month = $0.00; Monthly revenue churn = 0%; Projection months = 2 months.

Apply the stated formula with these inputs. Monetary examples use USD; percentages are divided by 100 inside the calculation. Intermediate calculations retain full precision and displayed amounts are rounded.

The second example uses simpler inputs to make the arithmetic easier to check. It is also included in the automated regression suite. These examples illustrate the model and are not market averages, live offers or personalized advice.

Assumptions and limitations

Constant absolute new and expansion MRR; churn applies to the prior month’s entire balance. Excludes downgrades beyond churn, refunds, tax, payment timing and cohort differences.

Use this output to frame a question or compare consistent scenarios. Reconcile any decision involving an actual product, employment agreement or financial statement with its underlying documents. If a contract uses different rounding or timing, its result may differ from this estimate.

Frequently asked questions

Sources and verification

The following primary sources provide background on the financial concepts. CalcPane’s formula and assumptions above define this specific model; these organizations do not endorse CalcPane or certify its outputs.

• SEC — Beginners’ guide to financial statements
• SBA — Plan your business

Formula implementation and worked examples checked by automated tests on 2026-10-17. Inspect this calculator’s inputs and expected outputs. Read our calculation methodology. Independent professional review has not been completed for this release.

Cite this calculator

CalcPane. (2026-10-17). SaaS MRR Growth and Churn Calculator. https://calcpane.com/saas-mrr-growth-churn-calculator/

Copy citation

Related calculators

• Freelance Billable Hourly Rate Calculator
• Employee Fully Loaded Cost Calculator
• SaaS Customer LTV to CAC Calculator
• Related original CalcPane calculator

All business and saas calculators · Complete calculator directory