MTTR Calculator

Calculate Mean Time To Repair from total repair time and the number of repairs, shown in hours and minutes. Calculates in your browser.

Mean time to repair

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In minutes-

Show the math

MTTR is the average time taken to repair a failed system and return it to service:

MTTR = total repair time ÷ number of repairs

Count only the hands-on repair time across all incidents. A lower MTTR means faster recovery, which directly improves availability. Calculated entirely in your browser.

What this does

An MTTR calculator finds the Mean Time To Repair — the average time to fix a failed system and return it to service.

How to use it

  1. Enter the total repair time.
  2. Enter the number of repairs.
  3. Read MTTR in hours and minutes.

How it works

A lower MTTR means faster recovery. Strictly it covers active repair time; including detection and waiting measures mean time to recovery.

MTTR = total repair time ÷ number of repairs

Understanding your result

A lower MTTR means faster recovery, and it pairs with MTBF to set real availability, often you gain more from cutting repair time than from chasing rarer failures. Note this is active repair time; if you fold in detection and waiting you are really measuring mean time to recovery, so be clear which one a target refers to.

Example

12 hours across 4 repairs gives an MTTR of 3 hours.

Sources & methodology

Last updated .

Frequently asked questions

What is MTTR?

Mean Time To Repair is the average time it takes to fix a failed system and return it to service. A lower MTTR means faster recovery.

How is it calculated?

Divide the total hands-on repair time by the number of repairs. For example, 12 hours across 4 repairs gives an MTTR of 3 hours.

Does it include waiting time?

Strictly, MTTR covers active repair time. If you include detection and waiting, you are measuring a broader metric sometimes called mean time to recovery.