SLA math
99.95% uptime: the step between three and four nines
Half the downtime budget of 99.9%. Teams pick it when three nines feels soft but four nines is not yet funded.
Target
99.95%
Allowed downtime / year
4.4 hours / year
Per month (avg)
21.9 minutes
Who uses it
Who usually picks 99.95%
Growing products with paying customers who notice multi-hour incidents.
Caveats
Read this before you print it on a sales slide
- Harder than 99.9% once you count deploys and dependency failures
- Needs faster detection and clearer paging — not just a nicer status page
FAQ
99.95% uptime, answered
Exact minutes for 99.95%, when to pick it over 99.9%/99.99%, and how fast checks should be.
Keep reading
Related SLA and cost tools
- What counts as good uptime
99.9% vs 99.99% vs 99.999% in plain English.
- How to write an uptime SLA
Promises you can actually keep.
- Downtime cost calculator
Turn outage minutes into dollars.
- 99.9% uptime
8.8 hours / year
- 99.99% uptime
53 minutes / year
- 99.999% uptime
5 minutes / year
Defend 99.95% with clearer pages
False pages waste the people who keep a 99.95% promise. Tallwatch opens incidents when at least two regions agree — Free includes consensus.