📈 SRE
SLA & Uptime Calculator
Convert uptime percentages to allowed downtime per year, month, week and day. Calculate composite SLAs for multi-service systems where all services must be available.
📖 How to Use This Tool
▼
1
Set target SLA percentage (e.g. 99.9%)
2
View downtime per day, week, month, year
3
Add services for Composite SLA calculation
4
Combined SLA is always lower than individual
📝 Examples
Three 9s
Input: 99.9%
Output: ~8h 46min downtime/year
📊 Uptime → Downtime
🔗 Composite SLA (Multi-Service)
When services run in series, the combined SLA is the product of all individual SLAs. Add each service below.
📋 Common SLA Reference
SLAPer YearPer MonthPer Day