How much downtime does 99% uptime allow?
99% (two nines) uptime allows 3d 15h 36m of downtime per year. Here is the full budget, by period.
| Per day | 14m 24s |
| Per week | 1h 40m 48s |
| Per month | 7h 12m |
| Per quarter | 21h 36m |
| Per year | 3d 15h 36m |
| Period | Allowed downtime |
|---|---|
| Per day | 14m 24s |
| Per week | 1h 40m 48s |
| Per month | 7h 12m |
| Per quarter | 21h 36m |
| Per year | 3d 15h 36m |
Detection matters as much as the budget. With 5-minute monitoring you can burn minutes of this allowance before you even detect an outage. PingInsight's true 1-second checks catch it almost immediately.
Back to the full uptime calculator or see how 1-second checks help you stay within budget.