SLA math
99.99%
Under an hour of downtime per year. Easy to put on a sales slide; hard to keep once humans deploy weekly.
- Per year
- 53 minutes
- Per month
- 4.4 minutes
- Per day (avg)
- 9 seconds
52 minutes a year. One sloppy deploy can spend it. False pages matter here because the humans defending this SLA cannot also chase flakes from a single probe path.
Who uses it
Who usually picks 99.99%
Payments, auth, and infrastructure-facing products where minutes are the unit of pain.
Caveats
Read this before you print it on a sales slide
- False pages burn the humans who defend this SLA — consensus matters
- Dependency SLAs (cloud, DNS, CDN) eat your budget if you count them
FAQ
99.99% uptime, answered
Exact minutes for four nines, who should promise it, and why false pages hurt more at this target.
Keep reading
Nearby numbers
Downtime cost calculator
Turn outage minutes into dollars.
99.999% uptime
5 minutes / year
99.95% uptime
4.4 hours / year
Four nines is a staffing problem first
The number is easy to print. The rotation that defends it is not. Start free if you want fewer false pages while you figure out whether you can actually keep this.