MTTR Calculator | How to calculate MTTR?

MTTR Calculator

Equipment failure can have a significant impact on any industrial operation, resulting in costly downtime and reduced productivity. One way of measuring equipment reliability is by using MTTR (Mean Time to Repair) and MTBF (Mean Time Between Failure) metrics. These two metrics can help manufacturers and maintenance industries understand the frequency and duration of equipment failures. By analyzing MTTR and MTBF data, businesses can make informed decisions to decrease downtime and improve overall equipment efficiency.

What is MTTR and why is it important?

Definition of MTTR

MTTR is a metric used to measure the average amount of time required to repair or replace a faulty component or piece of equipment. MTTR includes the time it takes to identify the problem, order and receive replacement parts, and complete the repair process. The formula for calculating MTTR is:

MTTR = Total time spent on repairs / Total number of repairs

Why is MTTR important?

MTTR is important because it quantifies the time it takes to recover from equipment failure. A low MTTR indicates that equipment can be repaired quickly, which means less downtime and more productivity. A high MTTR, on the other hand, can signify a significant breakdown or a malfunction, resulting in longer downtimes and lost profits.

How to calculate MTTR?

To calculate MTTR, the total amount of time spent on maintenance and repair activities needs to be divided by the total number of failures in a given period. This calculation can be performed manually or by using a spreadsheet to track the time of each repair.

What is MTBF and how is it related to MTTR?

Definition of MTBF

MTBF (Mean Time Between Failure) is a metric used to measure the average amount of time between equipment failures. MTBF represents the time between a failure and the next one. The formula for calculating MTBF is:

MTBF = Total amount of time / Total number of failures

How is MTBF related to MTTR?

MTTR and MTBF are interrelated metrics that can help monitor and improve equipment reliability. MTBF measures the time between failures, while MTTR represents the time needed to fix a failed component or equipment. A low MTTR and high MTBF signify that equipment rarely fails, and if it does, repairs can be done swiftly. This translates to minimal downtime and higher productivity.

How to calculate MTBF?

MTBF can be calculated by dividing the total amount of operational time by the total number of failures over a given period. This metric is critical in determining the expected lifespan of equipment and helps manufacturers and maintenance industries to optimize equipment maintenance schedules.

How to calculate MTTR using a calculator or spreadsheet?

MTTR calculator template

A calculator or spreadsheet can significantly simplify the process of calculating MTTR. Online MTTR calculators exist that can calculate the MTTR value using the number of repairs and the total amount of maintenance time spent. A pre-built spreadsheet can also be utilized, where the total time spent on repairs and the total number of failures is entered to calculate MTTR.

Using a spreadsheet to calculate MTTR

Using a spreadsheet to calculate MTTR requires tracking the time it takes to repair failed equipment or components. The data is entered into the spreadsheet, which computes the MTTR value automatically. MTTR can also be calculated using a graph, which collects repair time data over a given period using a histogram chart on an Excel spreadsheet.

MTTR calculator formula

The formula for calculating MTTR involves dividing the total repair time by the total number of failures. A more refined calculation includes only the time spent on the repair process.

How to use MTTR and MTBF to measure reliability?

How do you measure reliability?

Reliability can be measured by analyzing MTBF and MTTR. MTBF measures the period between equipment failures, while MTTR calculates the duration it takes to repair or replace failed components or equipment. A low MTBF indicates that equipment is prone to failure while a high MTTR indicates that any downtime is short-lived, which increases productivity and efficiency.

Calculating availability using MTBF and MTTR

Equipment availability can be determined by comparing the expected MTBF against the MTTR rate. Availability can be calculated using this formula:

Availability = MTBF / (MTBF + MTTR)

How to reduce downtime using MTTR and MTBF?

By tracking and analyzing MTTR and MTBF data, manufacturers and maintenance industries can understand the cause of equipment failures. Addressing the root cause of the problem can help reduce the frequency of failures, leading to decreased downtime and increased productivity.

MTTR calculation in manufacturing and maintenance industries

How can MTTR be used in manufacturing?

In manufacturing, MTTR is used to monitor and improve equipment reliability, as it can help identify the cause of failure. It can also be used to decide whether a machine should be repaired on-site or moved to a service center for repair. By tracking MTTR, manufacturers can reduce the time it takes to get failed equipment back in operation.

Importance of MTTR in maintenance industries

MTTR is an essential metric in maintenance industries, as it helps identify which equipment requires more maintenance and which can perform efficiently with minimal repairs. By tracking MTTR data, maintenance teams can plan maintenance schedules, stock spare parts, and provide technicians with proper training, ultimately leading to higher equipment reliability.

Maximizing equipment efficiency using MTTR

By analyzing MTTR data, manufacturers and maintenance industries can make data-driven decisions leading to a reduction in downtime and an increase in productivity. Strategies such as preventative maintenance schedules and optimizing repair procedures can help minimize failure rates and repair times. Tracking and analyzing MTTR and MTBF data can help improve equipment efficiency and make informed decisions about when to replace equipment.

In conclusion, understanding MTTR and how to calculate it using a calculator or spreadsheet can be highly beneficial in determining equipment reliability and reducing downtime. By measuring and analyzing MTBF and MTTR, manufacturers and maintenance industries can make data-driven decisions to improve overall equipment efficiency.


MTBF stands for Mean Time Between Failures. It is the average time between two failures of a system or machinery.

It is a tool used to calculate and evaluate the MTBF and MTTR of a system or machinery, respectively. By taking into account the number of times the system failed and the amount of time it took to repair it, the calculator can provide useful data and insights into the system’s performance and reliability.

The MTBF is calculated by dividing the total production uptime by the number of downtime periods or failures. The equation is MTBF = total production uptime/number of downtime periods.

The MTTR is calculated by dividing the total time it took to repair the system or machinery by the number of times it failed. The equation is MTTR = total repair time/number of failures.

MTBF and MTTR are two of the most important metrics used to evaluate the performance and reliability of a system or machinery. The main difference is that MTBF measures the average time between two failures, while MTTR measures the average time it takes to repair a system or machinery after it has failed.

MTBF and MTTR have a huge effect on a manufacturing environment’s efficiency and productivity. By pre-emptively identifying and addressing potential system failures, you can significantly reduce downtime periods and maintenance costs, ultimately improving the total production uptime and overall systems performance.

Improving MTBF and MTTR requires a well-trained and efficient maintenance team that can quickly and accurately diagnose and repair system failures at every step. Regular maintenance, additional training, and the use of reliable, high-quality equipment can also help improve both metrics.

MTTR is inversely proportional to the availability of a system or machinery. In other words, the longer it takes to repair a system or machinery, the less available it is for use.

No, MTTR and lead time are different. MTTR measures the average time it takes to remove and replace a faulty component, while lead time measures the amount of time it takes for a new component to arrive after it has been ordered.

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