SaaS MRR Calculator: Track Monthly Recurring Revenue Growth for 2026

Calculate and project your SaaS monthly recurring revenue including new MRR, churn, and expansion. Forecast ARR growth over time.

Mathematical Audit

How SaaS MRR Is Calculated

MRR accounts for new revenue, churned revenue, and expansion revenue to determine net growth.

New MRR = New Customers × Avg Revenue Per Customer
Churned MRR = Current MRR × Churn Rate
Expansion MRR = Current MRR × Expansion Rate
Net New MRR = New MRR − Churned MRR + Expansion MRR
ARR = Ending MRR × 12

Negative churn occurs when expansion revenue exceeds churned revenue. This is a strong growth indicator and means the business grows even without new customers.

Operational Guide

How to Use the SaaS MRR Calculator

1

Enter current MRR

Your total monthly recurring revenue before any changes this month.

2

Set new customer metrics

Enter expected new customers and their average monthly revenue.

3

Set churn and expansion rates

Monthly churn rate (percentage of MRR lost) and expansion rate (upsells/upgrades).

4

Review MRR projections

See monthly MRR growth trajectory and annualized revenue over your selected time horizon.

Real-World Scenario Example

"A SaaS startup with $10,000 MRR adds 20 customers at $50/mo, has 5% monthly churn and 3% expansion."

Inputs

currentMRR:10000
newCustomers:20
avgRevenuePerCustomer:50
churnRate:5
expansionRate:3
months:12

Result

Net new MRR of $800/month. Ending MRR of $10,800. ARR of $129,600. After 12 months, projected MRR reaches ~$20,600.

Important Disclaimer

Projections assume consistent growth rates and churn. Actual SaaS metrics fluctuate due to seasonality, market conditions, and product changes.

Internal Linking

Related Calculators

Finance & Web3

Business Break-Even Calculator

Calculate your break-even point in units and revenue. Find out exactly how many sales cover your fixed and variable costs.

Try it free
Finance & Web3

Business Valuation Calculator

Estimate your business value using SDE or EBITDA multiples. Get low, mid, and high valuation ranges based on industry standards.

Try it free
Finance & Web3

Profit Margin & Markup Calculator

Calculate gross margin, net margin, and markup percentage from revenue and costs instantly. See the difference between margin and markup. Works for any business type.

Try it free
E-E-A-T Genuineness

Sources & References

Baremetrics — How to Calculate MRR for SaaS

https://baremetrics.com/academy/saas-calculate-mrr

Paddle — MRR Churn: Calculating and Reducing Churn Rate for SaaS

https://www.paddle.com/resources/mrr-churn

Maxio — What Is MRR Churn? Formula, Benchmarking & Importance

https://www.maxio.com/saaspedia/mrr-churn