Free tool
Uptime Calculator
Find out what an SLA really means — '99.9%' is nearly 9 hours of downtime a year.
%
Try 99.9, 99.95 or 99.999.
| Period | Allowed downtime |
|---|---|
| Per day | 1m 26s |
| Per week | 10m 4s |
| Per month (30d) | 43m 11s |
| Per year (365d) | 8h 45m 35s |
Go beyond this tool. Manage Monitoring across every provider — in one dashboard.
Get started free →Three nines (99.9%) sounds great until you realise it allows almost 9 hours of downtime a year. This calculator translates any SLA into real, allowed downtime so you can set honest targets.
Use it to plan maintenance windows or to evaluate a provider’s SLA.
InfraNest
Know before your users do
InfraNest monitors your sites and services continuously, with multi-probe checks and smart alerting so you catch real outages fast.
- HTTP, keyword, SSL, DNS, ping & heartbeat checks
- Multi-probe with flapping protection
- Uptime stats & response-time charts
- Public status pages