Calculating trial conversion rate in Billing
Trial conversions are calculated by dividing the number of conversions in the last 30 days by the number of ended trials, either by conversion or cancellation, in the last 30 days.
A trial converts when the full trial period has ended, the subscription has not been canceled, and the first invoice has been paid.
Even if a customer cancels shortly after paying their first invoice, we will still consider their trial converted.
Stripe Billing uses a rolling 30-day window to sum the number of conversions and the number of trial cancellations, which occurs when a subscription that is still trialing is cancelled.