Uptime calculator
Your host promises "99.9% uptime" — but how much downtime is that? Type a percentage to see the allowed downtime per day, week, month and year, or enter how long you were down to get the uptime you actually achieved.
| Period | Allowed downtime |
|---|
Uptime: —
Want to know your real number? PingRobot measures uptime for every monitor and shows it per day, week and month. Read: what 99.9% uptime really means.
Frequently asked questions
How much downtime does 99.9% uptime allow?
About 1 minute 26 seconds per day, 10 minutes 5 seconds per week, 43 minutes 50 seconds per month (30.44 days) and 8 hours 45 minutes 36 seconds per year (365 days).
How is uptime percentage calculated?
Uptime percentage is (total time minus downtime) divided by total time, times 100. For example, 30 minutes of downtime in a 30-day month is (43,200 − 30) / 43,200 = 99.93%.
What month and year length does this calculator use?
A 365-day year and an average month of 30.44 days (365.25 days divided by 12), the conventions most SLA tables use.