SLA Uptime Calculator
Enter SLA % — see exact downtime budget per year, month, week, day
40 SLA calculations
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| SLA | Name | Downtime / Year | Downtime / Month | Downtime / Week | Typical Use |
|---|
Microsoft's contractual SLA commitments. Click a row to calculate its downtime budget.
| Service | SLA % | Downtime / Year | Downtime / Month | Notes |
|---|
Source: Microsoft SLA for Online Services. Check for updates periodically.
Track actual outages and see your real SLA performance.
How does the SLA calculator work?
Enter a target SLA percentage (like 99.9%) and instantly see the maximum allowed downtime per year, month, week, and day — in days, hours, minutes, and seconds.
What's the difference between forward and reverse mode?
Forward mode takes an SLA % and shows downtime. Reverse mode takes your actual downtime and calculates what SLA % you achieved — perfect for incident reports.
What are Microsoft's actual M365 SLAs?
Microsoft commits to specific uptime percentages per service. The M365 SLAs tab shows the contractual commitments for Exchange, Teams, SharePoint, and more, sourced from Microsoft’s SLA documentation.
What does 'five nines' mean?
Five nines (99.999%) means less than 5 minutes and 15 seconds of downtime per year. Each additional ’nine’ dramatically reduces the allowed outage window.
Can I share my calculation?
Yes! Your forward calculator SLA percentage is encoded in the URL — just copy and share the link. The recipient sees the same calculation.
Is this tool still being improved?
Yes! This is V1 and we’d love your feedback. Visit our feedback page to suggest features or improvements.
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