MRR Growth Rate formula:

=('Data Entry'!D13-'Data Entry'!D12)/'Data Entry'!D12

Takes this month's MRR, subtracts last month, divides by last month.

Format as percentage. And you are done.

The 5 formulas you need:
- Total Customers
- MRR
- MRR Growth Rate
- Churn Rate
- Average Revenue Per Customer
Everything else is noise until you hit scale.

You need 2 sheets:
1. Data Entry - raw numbers only, no formulas
2. Dashboard - all the calculations
Why separate them? Because if you accidentally screw up a formula, you won't delete 3 months of revenue data.