How do I calculate my own hourly downtime cost?

Start with your organisation’s revenue divided by annual operating hours as a first-pass number. Add average recovery-labour cost (loaded FTE rates × expected responder count × MTTR). Add expected SLA credits at contract rates. Add expected regulatory or contractual exposure. Add a reasonable churn assumption (industry-average churn × affected customer count × customer LTV). The result is your organisation-specific expected cost per hour of unplanned outage. It will almost certainly be higher than the ITIC median if you run any transactional service.