Instantly calculate your Service Level Agreement uptime percentage, allowed downtime per year, month, week, and day. Includes real-time downtime counter, nines of availability chart, and MTTR/MTBF calculator.
Calculate SLA NowEnter a custom uptime percentage or choose from preset SLA tiers. Results update instantly.
| Period | Total Time | Allowed Downtime | Uptime Time | In Minutes | In Seconds |
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Everything you need to understand, track, and report on Service Level Agreement uptime and downtime.
Enter any uptime percentage from 1% to 99.9999% and instantly get downtime allowances across all time periods — year, month, week, and day.
Visually compare your SLA against industry-standard tiers — two nines through six nines — with highlighted current position for instant context.
Track ongoing outages in real-time with our built-in incident timer. Log multiple incidents with descriptions for SLA compliance reporting.
Calculate actual system availability using Mean Time Between Failures and Mean Time To Repair — the engineer's approach to SLA measurement.
Download your SLA calculations as CSV or TXT for documentation, compliance reporting, and sharing with stakeholders and management.
Fully responsive layout works perfectly on phones, tablets, and desktops — calculate SLA uptime anywhere, anytime, on any device.
Calculate your SLA uptime and downtime allowance in three simple steps.
Choose from preset SLA tiers (99%, 99.9%, 99.99%, etc.) or type a custom uptime percentage into the input field.
Press the Calculate SLA button to instantly compute allowed downtime across all time periods and compare against industry nines.
Analyse the downtime table, nines comparison chart, and key metrics. Export results as CSV or TXT for SLA reporting and documentation.
Switch to the Downtime Counter tab to track live outages in real-time, log multiple incidents, and generate reports for SLA compliance.
A Service Level Agreement (SLA) uptime calculator is an essential networking tool that transforms an uptime percentage into meaningful, actionable downtime figures. Every cloud provider, hosting company, or managed service vendor expresses system availability as a percentage — but what does 99.9% actually mean in real hours and minutes? That is exactly what this SLA downtime calculator reveals.
Understanding your SLA downtime allowance is critical for planning maintenance windows, designing disaster recovery strategies, and negotiating vendor contracts. For instance, a 99.9% uptime SLA (three nines) permits approximately 8.77 hours of downtime annually — roughly 43 minutes per month. By contrast, a 99.999% (five nines) SLA limits total downtime to just 5.26 minutes per year, making it the gold standard for mission-critical infrastructure like financial systems and emergency services.
Our SLA uptime calculator goes beyond basic percentage conversion. It includes a real-time downtime counter for tracking live outages, a MTTR/MTBF calculator for engineering-grade availability measurement, and a visual nines of availability comparison chart. Whether you are an IT manager auditing vendor SLAs, a DevOps engineer designing high-availability architecture, or a business owner assessing system availability requirements, this tool provides the complete picture you need. Export results in CSV or TXT for compliance documentation, SLA breach reporting, or executive presentations — all completely free, with no registration required.
Common questions about SLA uptime, downtime calculations, and system availability.
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