How much downtime does 99.9% uptime allow?
99.9% (three nines) uptime allows 8h 45m 36s of downtime per year. Here is the full budget, by period.
| Per day | 1m 26s |
| Per week | 10m 5s |
| Per month | 43m 12s |
| Per quarter | 2h 9m 36s |
| Per year | 8h 45m 36s |
| Period | Allowed downtime |
|---|---|
| Per day | 1m 26s |
| Per week | 10m 5s |
| Per month | 43m 12s |
| Per quarter | 2h 9m 36s |
| Per year | 8h 45m 36s |
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.