A 365-day year and a 30.4-day month
A month here is a twelfth of a year, which is how most SLAs quote it. A 31-day month allows a little more downtime in minutes, and February a little less.
SLA uptime calculator
Turn an uptime percentage into the downtime it allows per day, week, month and year, or work back from downtime to uptime. It runs in your browser: nothing you type is sent anywhere.
- Downtime per day
- 1m 26s
- Downtime per week
- 10m 5s
- Downtime per month
- 43m 48s
- Downtime per year
- 8h 45m 36s
From downtime to uptime
The outage minutes in a period, and the uptime they leave.
- Uptime
- 99.9%
Downtime by SLA
The uptimes SLAs are usually written at, and the downtime each one allows.
| Uptime | Per day | Per week | Per month | Per year |
|---|---|---|---|---|
| 99% | 14m 24s | 1h 40m 48s | 7h 18m | 3d 15h 36m |
| 99.5% | 7m 12s | 50m 24s | 3h 39m | 1d 19h 48m |
| 99.9% | 1m 26s | 10m 5s | 43m 48s | 8h 45m 36s |
| 99.95% | 43s | 5m 2s | 21m 54s | 4h 22m 48s |
| 99.99% | 9s | 1m | 4m 23s | 52m 34s |
| 99.999% | 1s | 6s | 26s | 5m 15s |
What the figures assume
The period resets the budget
An SLA measured monthly forgives last month's outage. The same uptime measured yearly lets a bad month use most of the year's allowance.
Read what counts as downtime
Most contracts leave out planned maintenance and outages you caused, and many count an outage from when you report it, not when it started.