MTBF/MTTR Calculator

System availability is calculated using the formula: Availability = MTBF / (MTBF + MTTR). This gives you the percentage of time a system is expected to be operational. For example, if MTBF is 1000 hours and MTTR is 2 hours, availability would be 99.8%. Higher MTBF or lower MTTR both improve overall availability.

In a series configuration, all components must work for the system to function, so overall reliability decreases as you add components. In a parallel configuration, the system works as long as at least one component is operational, so adding redundant components increases reliability. This calculator helps you model both configurations to design more resilient systems.

The downtime cost calculator multiplies your expected annual downtime hours by your hourly cost of downtime. It accounts for revenue loss, productivity impact, and reputation damage. The tool also shows potential savings from reliability improvements, helping you justify investments in better infrastructure or redundancy.

The SLA compliance mode calculates what availability percentage you need to meet common SLA targets like 99.9% (three nines), 99.99% (four nines), or 99.999% (five nines). It shows allowed monthly downtime for each level and helps you determine if your current MTBF and MTTR metrics can achieve your SLA commitments.

The incident analyzer mode lets you input failure timestamps and repair durations from historical data. It automatically calculates MTBF, MTTR, and failure rates based on your actual incidents. This is more accurate than theoretical calculations because it reflects your real-world operational experience.

Failure rate is the inverse of MTBF and represents how many failures you can expect per unit of time. If your MTBF is 1000 hours, your failure rate is 0.001 failures per hour. This metric is useful for planning maintenance schedules and spare parts inventory, as it tells you approximately when to expect the next failure.