What this calculator does
Wrench time = direct hands-on maintenance time ÷ paid maintenance labor time × 100. Direct work excludes travel, waiting, parts hunting, permits, job preparation, and administrative time.
Inputs and formula
Use matching work-order and labor records for one stated reporting period; the formula and boundary are defined on this page.
When to use it
Use it to find systemic execution loss and test whether better planning, kitting, access, or scheduling removes friction.
Worked example and interpretation
140 direct hours from 320 paid hours gives 43.75%. Investigate system causes rather than using the measure as a rating of individual technicians.
Practical notes and limitations
Time-study sampling and detailed time coding can produce different values. Preserve the observation definition across teams and periods before comparing trends.