How much downtime does 90% uptime allow?
90% (one nine) uptime allows 36d 12h of downtime per year. Here is the full budget, by period.
| Per day | 2h 24m |
| Per week | 16h 48m |
| Per month | 3d |
| Per quarter | 9d |
| Per year | 36d 12h |
| Period | Allowed downtime |
|---|---|
| Per day | 2h 24m |
| Per week | 16h 48m |
| Per month | 3d |
| Per quarter | 9d |
| Per year | 36d 12h |
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.