📊

Server Uptime Calculator

Calculate server uptime percentages and SLA compliance. Convert between uptime and downtime metrics for daily, weekly, monthly, or yearly periods.

Calculation Mode

Time Period

Uptime Percentage

Features

Multiple Calculation Modes

Calculate from uptime percentage, downtime duration, or check SLA compliance

Multiple Time Periods

Calculate for daily, weekly, monthly, or yearly periods with accurate breakdowns

SLA Tier Comparison

Compare against common SLA tiers from 90% to 99.999% (five nines)

Understanding SLA Tiers

99.9% (Three Nines)

Per Year
8.77 hours
Per Month
43.8 minutes
Per Week
10.1 minutes
Per Day
1.44 minutes

99.99% (Four Nines)

Per Year
52.6 minutes
Per Month
4.38 minutes
Per Week
1.01 minutes
Per Day
8.64 seconds

99.999% (Five Nines)

Per Year
5.26 minutes
Per Month
26.3 seconds
Per Week
6.05 seconds
Per Day
0.86 seconds

How to Use

📈 Calculate from Uptime Percentage

  1. 1. Select "From Uptime %" mode
  2. 2. Choose your time period (day, week, month, year)
  3. 3. Enter your uptime percentage (e.g., 99.9)
  4. 4. View the calculated downtime in various units

⏱️ Calculate from Downtime Duration

  1. 1. Select "From Downtime" mode
  2. 2. Choose your time period
  3. 3. Enter downtime in hours, minutes, and seconds
  4. 4. See the calculated uptime percentage

✅ Check SLA Compliance

  1. 1. Select "SLA Checker" mode
  2. 2. Choose your time period
  3. 3. Enter your actual uptime percentage
  4. 4. Set your SLA target percentage
  5. 5. See if you meet the target and by how much

SLA Best Practices

1

Set Realistic Targets

Choose SLA targets that match your infrastructure capabilities. Five nines (99.999%) requires significant investment and redundancy.

2

Include Planned Maintenance

Decide whether planned maintenance windows count toward downtime in your SLA calculations.

3

Monitor Continuously

Use monitoring tools to track actual uptime and get alerts before you breach SLA thresholds.

4

Plan for Redundancy

Higher SLA targets require redundancy at every level: servers, network, power, and data centers.

5

Document Everything

Keep detailed logs of all downtime incidents, their causes, and resolution times for SLA reporting.

6

Consider Time Zones

When calculating monthly/yearly SLAs, ensure you're using consistent time zone references.

Common Use Cases

💼

Contract Negotiation

Calculate acceptable downtime windows when negotiating hosting or cloud service contracts.

📈

Performance Reporting

Generate accurate uptime reports for management or clients based on monitoring data.

⚡

Incident Planning

Understand how much downtime budget remains after an outage to plan maintenance windows.

🎯

Goal Setting

Set realistic uptime goals for your team based on current infrastructure capabilities.

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