SLA Downtime Calculator
Calculate allowed downtime from your SLA percentage. Find out how many minutes per day, month, and year your service can be down while meeting your SLA.
How to Use the SLA Calculator
- Enter your SLA percentage (e.g., 99.9).
- Click Calculate to see allowed downtime.
- Review daily, monthly, and yearly downtime values.
Use Cases
- •Defining service level agreements with clients.
- •Planning maintenance windows within SLA constraints.
- •Comparing SLA tiers for cloud services.
- •Negotiating uptime commitments with vendors.
Formula
Downtime = (1 − SLA%) × period. Daily: ×1440 min. Monthly: ×43,200 min. Yearly: ×525,600 min.
Frequently Asked Questions
What does 99.9% SLA mean?
99.9% SLA (three nines) allows about 8.76 hours of downtime per year, or ~43.8 minutes per month.
What is five nines?
Five nines (99.999%) allows only ~5.26 minutes of downtime per year — used for mission-critical systems.
How is SLA downtime calculated?
Downtime = total period × (1 − SLA/100). For example, 99.9% monthly = 43,200 × 0.001 = 43.2 minutes.