Tools / SLA & error budget
SLA uptime & error-budget calculator
Turn an availability target into the downtime it actually permits, and see how much error budget a review period buys you.
Uptime → allowed downtime
Error budget
How it's calculated
- Allowed downtime = period × (1 − uptime/100). Months use 30 days, years 365.
- Error budget = the same figure for your SLO over the chosen period; “remaining” subtracts what you've already spent.
- “Three nines” (99.9%) ≈ 43m 12s per 30-day month; “four nines” (99.99%) ≈ 4m 19s.