Monthly recurring revenue (MRR) is a metric that measures the total amount of recurring revenue a business expects to receive each month, and is one of the most important metrics for monetized newsletters. No other metric encapsulates the health of every aspect of your newsletter, from your audience size to your pricing to your stickiness.
MRR is a notoriously tricky metric to calculate; depending on your business model and level of accounting sophistication, there can be many different ways to calculate it. (How do you account for coupons? Do you pro-rate arrears? Do you include refunds? The list goes on.)
In general, we recommend referring to Stripe's MRR metric for a more detailed and accurate calculation for your account; consider ours more of a best-guess estimate. Some notes on our own calculation: