SLO 'Error Budget' Calculator - Free Online IT Tool

📉 SLO 'Error Budget' Calculator

Calculate allowed downtime based on Service Level Objectives (99.9% - 99.999%).

ℹ️ About SLO 'Error Budget' Calculator

The SLO 'Error Budget' Calculator is a critical tool for Site Reliability Engineers (SREs) and system administrators to define and track service reliability. In modern DevOps, an Error Budget represents the maximum amount of time a technical service can fail without violating its Service Level Objective (SLO).

For example, a standard 'three nines' target (99.9%) over a 30-day window only allows for approximately 43 minutes of total downtime. This tool helps teams make informed decisions about balancing new feature velocity with the need for infrastructure stability. If your error budget is exhausted, it's a clear signal to prioritize stability and bug fixes over new deployments.

📖 How to use SLO 'Error Budget' Calculator

1. Enter your target uptime percentage (e.g., 99.9 for 'three nines' or 99.99 for 'four nines').
2. Specify the measurement window in days (commonly 30 or 90 days).
3. Click 'Run Tool' to calculate your total downtime allowance.
4. Use the 'Daily' and 'Weekly' breakdowns to monitor your reliability in real-time.

❓ Frequently Asked Questions

What is the difference between SLA and SLO?

An SLA (Service Level Agreement) is a legal contract with a customer that includes penalties. An SLO (Service Level Objective) is an internal target used by engineering teams to maintain reliability.

Why is 100% uptime not recommended?

Achieving 100% uptime is prohibitively expensive and often unnecessary. An error budget allows for planned maintenance and provides a buffer for unavoidable failures.