SLA Downtime Calculator – Allowed Downtime per SLA
Calculate allowed downtime per year, month, and week for any SLA percentage.
About This Calculator
Calculate allowed downtime per year, month, and week for any SLA percentage. Use the calculator above for instant results.
Worked Examples
- Year: 526 min (8.77 hrs) | Month: 43.8 min | Week: 10.1 min
- Day: 86.4 seconds
Answer: 8.77 hrs/year
- Year: 52.6 min | Month: 4.38 min | Day: 8.64 seconds
Answer: 52.6 min/year
- Year: 43.8 hrs | Month: 3.65 hrs | Week: 50.4 min
Answer: 43.8 hrs/year
Who Uses This Calculator?
Calculate SLA budget.
Set and report on SLAs.
Error budget management.
SLA-driven architecture design.
Common Mistakes to Avoid
❌ SLA is not the same as error budget
Error budget = 100% - SLA%. Spend it wisely on deployments and maintenance. Track burn rate.
❌ Cascading SLAs
A service dependent on 3 components each at 99.9% SLA is only 99.7% available (0.999³).
Frequently Asked Questions
Error budget concept?
If your SLA is 99.9%, you have 0.1% error budget per month (43.8 minutes). Use it for deployments. If burned, freeze releases.
SLA vs SLO vs SLI?
SLI: actual measurement (latency p99). SLO: target (p99 < 200ms). SLA: contract with penalties. SLIs are measured, SLOs are targets, SLAs are commitments.
Typical cloud SLAs?
Storage: 99.9-99.999%. Compute: 99.9-99.99%. Managed databases: 99.9-99.999%. Always check the fine print on what qualifies as downtime.