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MTTR Calculator

Mean repair/restoration time from recorded interventions.

Inputs

Illustrative example values — replace them with data from your analysis period.

Results

Mean time to repair / restore3 hours

A lower MTTR generally reflects faster restoration, provided intervention scope and data capture remain comparable.

Formula and scope

MTTR = total repair or restoration time / number of repairs. Here MTTR means the average duration represented by the entered restoration records.

Results use only visible inputs. OEE thresholds are configurable references, never universal standards. Downtime costs are scenario estimates, not accounting measurements; avoid adding a cost already included in the unit value or contribution margin.

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Engineering reference

MTTR Calculator – Mean Time to Repair

Calculate average repair or restoration duration from recorded intervention time and count.

Calculation method

Total repair or restoration time is divided by the number of repairs in the same observation scope.

Formulas used

  • MTTR = total restoration time / number of repairs

Worked example

Example: 18 repair hours over 6 interventions gives an MTTR of 3 h.

How to interpret the result

A lower MTTR generally indicates faster restoration, provided the start/end definition and intervention mix are comparable.

Common mistakes

  • Mixing hands-on repair time with total production delay.
  • Excluding difficult repairs without disclosure.

Scope and limitations

  • Use one consistent observation boundary and validated production or maintenance records.

Frequently asked questions

What time should MTTR include?

Use the restoration boundary defined for your KPI and apply it consistently to every intervention.

Is lower MTTR always better?

Generally, but verify repair quality and recurrence; speed alone can hide repeat failures.

Does MTTR include spare-part waiting?

Only if your chosen restoration definition includes it; document the scope.