Uptime and downtime calculator
Set realistic targets and understand what a given percentage means in minutes.
Downtime allowance
| Period | Allowed downtime |
|---|---|
| day | 1 min 26 s |
| week | 10 min 5 s |
| month | 43 min 50 s |
| quarter | 2 h 11 min |
| year | 8 h 46 min |
Observed availability from measured durations
Time with no observation
Availability: no evaluable time · Coverage: 0.0%
Unknown time is excluded from the availability figure and reported as reduced coverage, never counted as uptime.
Measure your real availability with time-weighted monitoring. Free for 5 monitors, no credit card.
Start monitoringHow it measures
- Allowance = period length × (1 − target). A month is 30.4375 days and a year 365.25 days.
- Observed availability uses the same formula as the product: available time over evaluable time, with unknown time reported as coverage, never as success.
Limits
- Contract definitions of downtime vary; check how your provider measures and excludes maintenance.