Build a Dynamic Revenue Run Rate Calculator in Google Sheets

Stop Wasting Time on Spreadsheet Math: Build a Revenue Run Rate Calculator in 5 Minutes

As a SaaS founder or startup CFO, you probably calculate your annual run rate (ARR) by multiplying MRR by 12. That's fine for a rough estimate — but it ignores growth and churn.

Here's a better way: build a dynamic Revenue Run Rate Calculator in Google Sheets that accounts for monthly growth rate, churn impact, and runs 12-month forecasts.

Step 1: Set Up Your Inputs
In a new sheet, create cells for:

• Current Month MRR ($50,000 example)
• Monthly Growth Rate (5%)
• Monthly Churn Rate (2%)

Step 2: Calculate True ARR
Instead of just =MRR*12, use:
=MRR*12*POWER(1+(Growth-Churn)/100,12)

This compounds your net growth over 12 months.

Step 3: Build a Monthly Forecast
Create columns for Month (1-12), Starting MRR, Growth Contribution, Churn Loss, Ending MRR, and Run Rate. Each row feeds into the next.

Step 4: Add Scenario Planning
Set up three growth/churn scenarios (conservative, moderate, aggressive) that feed into your main calculator.

Want the full template?
I've built a ready-to-use Revenue Run Rate Calculator in Google Sheets with:

• Pre-filled demo data (so you see it work immediately)
• 4 tabs: Dashboard, Monthly Forecast, Cohort Retention, Scenario Builder
• All formulas unlocked and documented

It's available now at MicroTools Studio — search "Revenue Run Rate Calculator." The tool costs $29 and saves you at least 2 hours of spreadsheet tinkering.

This article originally appeared on MicroTools Studio — building simple financial tools for founders and investors.