Enter the total number of stoppages and the total downtime into the calculator to determine the mean time to repair (MTR).

MTR Formula

The following formula is used to calculate a mean time to repair.

MTR = D / S
  • Where MTR is the mean time to repair (hrs/min)
  • D is the total downtime (hrs/min)
  • #S is the total number of stoppages

To calculate the mean time to repair, divide the total downtime by the number of stoppages.

MTR Definition

What is mttr?

MTTR, also sometimes denoted MTR, which is short for mean time to repair, is a term used to describe the average amount of time it takes for a piece of equipment, typically machinery, to be repaired when it has a technical issue or stoppage.

The mean time to repair is used for calculations such as overall equipment effectiveness, which allows businesses and companies to analyze how well their equipment is performing.

For example, if a machine has very few failures or stoppages but that machine takes a very long time to repair, it’s no better than a machine that stops frequently but can be fixed in a very short amount of time.

Example Problem

How to calculate the mean time to repair?

The following example problem outlines the information and steps required to calculate an average time to repair.

First, determine a time period that will be analyzed for stoppages and repairs. In this example, the time is a 6-month period.

Next, measure the total number of stoppages during the time period. In this case, there were 4 stoppages measured.

Next, measure the total downtown of the machine over the 6 months. This is found to be 40 hours.

Finally, calculate the mean time to repair (MTR) using the forum above:

MTR = D / #S

MTR = 40 / 4

MTR = 10 hours