Tools
Three free calculators. Each one states the formula, starts from labeled sample data, and links to the guide that shows the working.
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MRR calculator
Monthly price of active and past-due subscriptions. Annual plans divide by 12.
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NRR calculator
Ending MRR from the customers you already had, divided by what they paid at the start.
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CAC payback calculator
Months of gross profit it takes to cover what you spent to acquire customers.