3 min · Warehousing, logistics, manufacturing

NIOSH lifting equation

Recommended Weight Limit and Lifting Index for a two-handed lift.

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A warehouse worker lifts a carton from a waist-height conveyor, holding it close

Illustrative

The load and the lift

Measure at the start (origin) of the lift. Example values are pre-filled - replace them with your measurements.

Load weightkgHorizontal distance (H)cmAnkles mid-point to hands mid-point. 25-63 cm.Hand height at start (V)cmFloor to hands. 0-175 cm.Vertical travel (D)cmDifference between start and end height. 25-175 cm.Twist angle (A)°0-135°.

Frequency, duration and grip

Lifts per minute (F)/minAverage over a 15-minute sample.Work durationGrip / coupling

Method: Waters et al. 1993; NIOSH 94-110. Waters TR, Putz-Anderson V, Garg A, Fine LJ (1993). Revised NIOSH equation for the design and evaluation of manual lifting tasks. Ergonomics 36(7):749-776; NIOSH Applications Manual, Publication 94-110.

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