99.95% Uptime Downtime Calculator & SLA Allowance
A 99.95% uptime commitment permits up to 21 minutes and 54 seconds of downtime per average month, or 4 hours and 22 minutes per year. It is frequently chosen by cloud platforms (such as AWS EC2 and Azure VMs) for single-region multi-AZ service level agreements.
99.95% Maximum Allowed Downtime by Time Window
Exact permissible service unavailability before breaching the 99.95% SLA target.
43.2s per 24 hours
302.4s per 7 days
1314.9s per billing month
15778.8s per 365.25 days
Calendar Month Length Variance for 99.95% SLA
Contractual downtime allowances vary based on the number of calendar days in the billing period.
| Month Duration | Total Time Available | Max Allowed Downtime | Downtime in Seconds |
|---|---|---|---|
| 28 Days (February Common) | 2,419,200 sec (672 hrs) | 20m 9.6s | 1209.6s |
| 30 Days (Apr, Jun, Sep, Nov) | 2,592,000 sec (720 hrs) | 21m 36s | 1296s |
| 31 Days (Jan, Mar, May, Jul, Aug, Oct, Dec) | 2,678,400 sec (744 hrs) | 22m 19.2s | 1339.2s |
| Standard Average Month (30.4375 Days) | 2,629,800 sec (730.5 hrs) | 21m 54.9s | 1314.9s |
Comparing 99.95% Against the Table of Nines
Understand how each additional "nine" reduces allowable downtime by an order of magnitude (10x).
| Availability Tier | SRE Classification | Daily Allowance | Weekly Allowance | Monthly Allowance | Yearly Allowance |
|---|---|---|---|---|---|
| 90.0% | 1 Nine | 2h 24m | 16h 48m | 3d 1h 48m | 36.5 Days |
| 95.0% | 1.5 Nines | 1h 12m | 8h 24m | 1d 12h 54m | 18.26 Days |
| 99.0% | 2 Nines | 14m 24s | 1h 40m | 7h 18m | 3.65 Days |
| 99.5% | 2.5 Nines | 7m 12s | 50m 24s | 3h 39m | 1.83 Days |
| 99.9% | 3 Nines | 1m 26s | 10m 5s | 43m 50s | 8h 46m |
| 99.95%Current | 3.5 Nines | 43.2s | 5m 2s | 21m 55s | 4h 23m |
| 99.99% | 4 Nines | 8.64s | 1m 0s | 4m 23s | 52m 36s |
| 99.995% | 4.5 Nines | 4.32s | 30.2s | 2m 11s | 26m 18s |
| 99.999% | 5 Nines | 0.86s | 6.05s | 26.3s | 5m 16s |
| 99.9999% | 6 Nines | 0.086s | 0.60s | 2.63s | 31.56s |
Recommended Architecture Stack
Multi-AZ Cloud Platform Resiliency
To reliably sustain a 99.95% SLA without exceeding error budgets, production systems typically implement:
- Multi-AZ Kubernetes Clusters with pod anti-affinity across failure domains
- Managed Redis/Memcached caching clusters with automated node failovers
- Database read-replicas with automatic promotion
- Pre-warmed health checks and graceful termination handlers (`preStop` hooks)
Standard SLA Contract Clause Template
Ready-to-use legal snippet for Master Service Agreements (MSA)
Calculate Custom Outage Durations & Realized Availability
Have you experienced an unexpected API incident? Input your exact downtime duration into our dual-mode calculator to instantly evaluate SLA compliance, credit tier liabilities, and error budget burn.
Frequently Asked Questions (99.95% Uptime)
Clear answers to common SRE, contractual, and technical SLA calculation questions.
Frequently Asked Questions
In a 30-day month, 99.95% uptime permits 21 minutes and 36 seconds of downtime. Over a standard average month (30.4375 days), it allows 21 minutes and 54.9 seconds.
Physical hardware degradation, hypervisor live-migrations, and underlying network maintenance can cause transient interruptions. 99.95% allows sufficient headroom for underlying infrastructure maintenance without contractual breaches.
Automate Your SLA Compliance Tracking with Uptara
Eliminate manual downtime spreadsheets. Continuously probe your APIs from global edge regions, aggregate quorum consensus, and export 1-click audit ledgers.