Operational incident cost calculator

This is a budgeting model, not a bill. Lost revenue is revenue per hour times downtime times the affected share times the never-recovered share, because most customers retry; the opposite mistake, pricing subscription churn after the outage, is not modeled, so long-running B2B losses are understated unless you raise the downtime itself. SLA credits only count when you enter the monthly fee, the measurement period uses fixed conventions (month means 30 days, quarter 90, year 365), and the largest tier whose availability threshold the period falls into wins. Availability is plain arithmetic: downtime past a whole period reports under 0 % rather than clamping.