Liberty Mutual Manual Materials Handling Population Percentiles
Manual Materials Handling

These online "Liberty Mutual Manual Materials Handling Population Percentiles" are based on the Liberty Mutual Manual Materials Handling Equations published by Potvin, et al., 2021. This manual material handling analysis online tool provides both the male and female population percentages capable of performing manual material handling tasks without perceived overexertion. The user is strongly advised to use the female population percentiles for design purposes (see “Interpreting Results”). The results can be used to perform ergonomic assessments of lifting, lowering, pushing, pulling, and carrying tasks with the primary goal of supporting ergonomic design interventions.

A man properly lifting an object

The illustrations, instructions and principles contained in the material are based on published research and, to the best of our knowledge, current at the time of publication. No attempt has been made to interpret any referenced codes, standards, or regulations. Please refer to the appropriate code, standard, or regulation-making authority for interpretation or clarification.