This says how often a product to be maintained to avoid breakdowns. The wrong predictions of a product’s stability lead to poor designs and performance of systems. This metric is simply known as average life expectancy. In this case, MTBF is the indicator of Performance expected from a specific system and also a metric for reliability and acts as a tool at the stage of design and production of hardware. And for critical products such as Airplanes, safety equipment assets, inverters, generators, etc., performance and stability are very important. Low MTBF always denotes that the system is not stable and not much operational. How often it gets a failure and how productive it is. Because a system’s performance relies on its stability. This value tells about Reliability, stability, and performance of a system. When it comes to industries, based on MTBF values only systems with different designs are compared.
Consumers mostly go with a price-driven approach hence do not mind much about MTBF. It is simply the number of failures occurring per hour. It is very important in Hardware product Industries rather than consumers. MTBF value simply tells about a product’s survival time. Thus the formula is,įR = 1 / MTBF Relevance and Uses of MTBF Formula Step 4: Failure Rate is just the reciprocal value of MTBF. Step 3: Finally MTBF can be calculated using the above formula. It is the number of failures occurred in a system. T = ∑ (Start of Downtime after last failure – Start of Uptime after last failure) Simply it can be said the productive operational hours of a system without considering the failure duration. It can be calculated by deducting the start of Uptime after the last failure from the start of Downtime after the last failure. Step 1: Note down the value of TOT which denotes Total Operational Time. Hence the system is more stable!! Explanationīelow is the step by step approach for attaining MTBF Formula. Hence the system will be down for every 11.25 hours that will result in a loss to the organization. Hence the overall operational time can be calculated is 22.5 hours. Since there are 2 failures of 1 and 0.5 hours, overall downtime for this system is 1.5 hours. However, the site is not available during 12-1 PM IST and also another incident during 3-3.30 am IST. Hence the system will be down for every 3.5 hours that will result in a loss to the organization.įailure Rate is calculated using the formula given belowįailure rate per hour would be 0.28571. MTBF is calculated using the formula given below Hence the overall operational time is 7 hours. TOT = ∑ (Start of Downtime after last Failure – Start of Uptime after last Failure) TOT is calculated using the formula given below Since there are 2 failures of 1 and 2 hours, overall downtime for this system is 3 hours. But there are two failures with the downtime of 1 hour and 2 hours. Calculate the MTBF and Failure rate. The overall operating hours of a system is 10 hours per day.
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You can download this MTBF Template here – MTBF Template MTBF Formula – Example #1