Track availability across outages, maintenance, incidents, and redundancy. See target gaps, yearly downtime, and cost. Get practical uptime insights for hosting and cloud planning.
Use the form below to measure uptime, downtime, cost exposure, and SLA performance for a single site or redundant setup.
| Facility | Period | Planned Downtime (min) | Unplanned Downtime (min) | Incidents | Target Uptime (%) | Cost Per Minute ($) |
|---|---|---|---|---|---|---|
| East Region Site | 1 year | 120 | 45 | 3 | 99.99 | 250 |
| Colocation Hub | 6 months | 90 | 20 | 2 | 99.95 | 180 |
| Edge Compute Node | 30 days | 30 | 15 | 1 | 99.90 | 95 |
These rows illustrate realistic sample inputs for hosting, cloud, and colocation uptime analysis.
1. Total downtime
Total Downtime = Planned Downtime + Unplanned Downtime
2. Uptime minutes
Uptime = Total Observation Period − Total Downtime
3. Availability percentage
Availability (%) = (Uptime ÷ Total Observation Period) × 100
4. Allowed downtime at target
Allowed Downtime = Total Observation Period × (1 − Target Uptime ÷ 100)
5. Downtime variance
Downtime Variance = Allowed Downtime at Target − Actual Total Downtime
6. MTTR
MTTR = Unplanned Downtime ÷ Incident Count
7. MTBF
MTBF = Uptime ÷ Incident Count
8. Unplanned outage cost
Outage Cost = Unplanned Downtime × Cost Per Minute
9. Redundant availability
Redundant Availability = [1 − (1 − A)n] × 100
Where A is single-path availability as a decimal and n is the number of independent parallel paths.
Month calculations assume 30 days. Year calculations assume 365 days.
Uptime percentage shows the portion of the observation period when the data center remained available. It compares total uptime against the full measured period, including planned and unplanned downtime.
Separating them helps teams understand whether availability loss comes from maintenance windows or unexpected failures. This supports better SLA reporting, operational planning, and root-cause improvement work.
MTTR is mean time to repair. It measures the average number of downtime minutes per incident and highlights how quickly teams restore service after an outage begins.
MTBF is mean time between failures. In this calculator, it estimates average uptime minutes between incidents, helping you judge service stability over the selected period.
The calculator assumes independent parallel paths with identical single-path availability. It then applies a standard parallel-availability formula to estimate combined resilience for redundant infrastructure designs.
Use the target defined in your service commitments, internal engineering goals, or customer contracts. Common values include 99.9%, 99.95%, 99.99%, and 99.999%.
Unplanned downtime usually causes the strongest business disruption, lost transactions, and recovery expense. Planned maintenance is often scheduled to reduce commercial and operational impact.
Yes. The calculator works for cloud regions, hosting clusters, colocation sites, edge facilities, and internal platforms wherever availability, incident frequency, downtime budgets, and SLA targets matter.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.