Tool
SLO and uptime calculator
Enter a target and window; get the allowed downtime per day, week, month, quarter and year, and the error budget in requests for a given traffic level. The inputs stay in the URL, so you can share the result.
Allowed downtime for any target.
Error budget = 100% − SLO target. Allowed downtime = error budget × period.
The nines, per 30 days.
| SLO target | Error budget | Allowed downtime per 30 days |
|---|---|---|
| 99% | 1% | 7 h 12 min |
| 99.5% | 0.5% | 3 h 36 min |
| 99.9% | 0.1% | 43 min 12 s |
| 99.95% | 0.05% | 21 min 36 s |
| 99.99% | 0.01% | 4 min 19 s |
| 99.999% | 0.001% | 26 s |