element stringlengths 18 56 | value_or_formula stringlengths 8 200 | description stringlengths 83 302 | source stringclasses 8
values |
|---|---|---|---|
Load Constant (LC) | 23 kg (51 lb) | Maximum recommended weight for an ideal two-handed symmetric lift: horizontal distance H=25 cm, vertical height V=75 cm, travel distance D=25 cm, asymmetry A=0°, frequency ≤0.2 lifts/min, good coupling. | NIOSH Technical Report 94-110 (1994) — Waters TR et al., Revised NIOSH Lifting Equation |
Recommended Weight Limit formula | RWL = LC × HM × VM × DM × AM × FM × CM | Composite formula. All six multipliers range from 0 to 1 (or 1 exactly for ideal conditions), so RWL ≤ LC. Units: kg (or lb if LC=51 lb is used). | NIOSH Technical Report 94-110 (1994) |
Horizontal Multiplier (HM) | HM = 25 / H | H = horizontal distance (cm) from mid-point between ankles to mid-point of hands at origin of lift. Valid range H: 25–63 cm. If H < 25 cm, set HM = 1. If H > 63 cm, the task is not assessable with this equation. | NIOSH Technical Report 94-110 (1994) |
Vertical Multiplier (VM) | VM = 1 − 0.003 × |V − 75| | V = vertical height (cm) of hands at origin of lift, measured from floor. Valid range V: 0–175 cm. VM = 1 at V = 75 cm (knuckle height). VM decreases as V moves away from 75 cm in either direction. | NIOSH Technical Report 94-110 (1994) |
Distance Multiplier (DM) | DM = 0.82 + (4.5 / D) | D = vertical travel distance (cm) between origin and destination of lift. Valid range D: 25–175 cm. If D < 25 cm, set D = 25 cm. | NIOSH Technical Report 94-110 (1994) |
Asymmetric Multiplier (AM) | AM = 1 − 0.0032 × A | A = angle of asymmetry (degrees) — the angular displacement of the load from the sagittal plane, measured at the origin. Valid range A: 0°–135°. AM = 1 at A = 0° (symmetric lift). If A > 135°, the task is not assessable. | NIOSH Technical Report 94-110 (1994) |
Frequency Multiplier (FM) | See NIOSH Table 5 (FM table) | FM is read from a published table based on (a) lifts per minute frequency, (b) duration of lifting task (≤1 h / 1–2 h / 2–8 h), and (c) whether V < 75 cm or V ≥ 75 cm. FM ranges from 0.00 (frequency too high) to 1.00. Tabular values cannot be reproduced here — consult NIOSH TR 94-110 Table 5 directly. | NIOSH Technical Report 94-110 (1994) Table 5 |
Coupling Multiplier (CM) | See NIOSH Table 7 (CM table) | CM reflects hand-to-object coupling quality: Good / Fair / Poor, each scored differently depending on whether V < 75 cm or V ≥ 75 cm. CM values: Good=1.00, Fair=0.95 (V≥75) or 1.00 (V<75), Poor=0.90. Consult NIOSH TR 94-110 Table 7 for exact conditions defining each coupling class. | NIOSH Technical Report 94-110 (1994) Table 7 |
Lifting Index (LI) — formula | LI = Load Weight / RWL | Load Weight is the actual mass of the object lifted (kg). RWL is the Recommended Weight Limit calculated from the equation above. LI is dimensionless. | NIOSH Technical Report 94-110 (1994) |
Lifting Index — acceptable threshold | LI ≤ 1.0 | A lifting index at or below 1.0 indicates the task is within acceptable limits for most healthy workers under the assessed conditions. | NIOSH Technical Report 94-110 (1994) |
Lifting Index — increased risk threshold | LI > 1.0 | A lifting index above 1.0 indicates increasing risk of musculoskeletal injury. The risk rises with increasing LI. | NIOSH Technical Report 94-110 (1994) |
Lifting Index — high risk threshold | LI > 3.0 | An LI above 3.0 is generally considered high risk. NIOSH notes that the proportion of workers likely to be at elevated risk of low-back pain increases substantially above this value. | NIOSH Technical Report 94-110 (1994) |
NIOSH equation applicability — two-handed lifts only | Applies to two-handed symmetrical and asymmetrical lifts | The revised equation is designed for two-handed manual lifting tasks only. It does not directly apply to one-handed lifts, pushing/pulling, carrying, or holding tasks. | NIOSH Technical Report 94-110 (1994) |
NIOSH equation applicability — worker population assumed | Healthy adults performing infrequent occupational lifting | The LC of 23 kg is set to protect approximately 99% of male workers and 75% of female workers under ideal conditions. The equation does not account for personal susceptibility, fatigue accumulation, or pre-existing conditions. | NIOSH Technical Report 94-110 (1994) |
UK MAC tool — green band (low risk) | Score 0–4 (per MAC factor score) | MAC risk band green indicates low risk. Scores apply per-factor (lifting, carrying, team handling). Precise score boundaries are defined in the HSE MAC tool guidance booklet INDG383(rev2). | UK HSE MAC Tool — INDG383(rev2), available at hse.gov.uk |
UK MAC tool — amber band (medium risk) | Score 5–8 (per MAC factor score) | MAC risk band amber indicates a medium level of risk. Further assessment and control measures should be considered. | UK HSE MAC Tool — INDG383(rev2), available at hse.gov.uk |
UK MAC tool — red band (high risk) | Score 9–12 (per MAC factor score) | MAC risk band red indicates a high level of risk. Immediate action to redesign the task is recommended. | UK HSE MAC Tool — INDG383(rev2), available at hse.gov.uk |
UK MAC tool — purple band (very high risk) | Score > 12 (per MAC factor score) | MAC risk band purple indicates a very high level of risk. Priority action required. | UK HSE MAC Tool — INDG383(rev2), available at hse.gov.uk |
Regulatory reference — UK | Manual Handling Operations Regulations 1992 (MHOR 1992) SI 1992/2793 | UK Regulations implementing EU Directive 90/269/EEC. Requires employers to avoid hazardous manual handling where reasonably practicable; otherwise assess and reduce risk. Amended by the Health and Safety (Miscellaneous Amendments) Regulations 2002. | UK Statutory Instrument SI 1992/2793; legislation.gov.uk |
Regulatory reference — EU | Council Directive 90/269/EEC of 29 May 1990 | EU Directive on the minimum health and safety requirements for the manual handling of loads where there is a risk particularly of back injury to workers. Sets framework obligations on employers across EU member states. | Official Journal of the European Communities L 156, 21.6.1990 |
NIOSH source publication | Waters TR; Putz-Anderson V; Garg A; Fine LJ (1994). Revised NIOSH Lifting Equation for the Design and Evaluation of Manual Lifting Tasks. NIOSH Technical Report 94-110. Cincinnati OH: US DHHS (NIOSH). | Primary peer-reviewed source for all NIOSH equation constants and multiplier formulas cited in this dataset. | US DHHS (NIOSH) 1994; available via cdc.gov/niosh |
Manual Handling & NIOSH Revised Lifting Equation Reference 2026
Reference dataset for the NIOSH Revised Lifting Equation (1994), multiplier formulas, Lifting Index interpretation, UK MAC risk bands, and key regulatory citations for manual handling risk assessment.
Details
- Publisher: SmartQHSE Ltd (https://www.smartqhse.com)
- License: CC BY 4.0
- Format: CSV (UTF-8)
- DOI: 10.5281/zenodo.20446741
- Landing page: https://www.smartqhse.com/datasets/manual-handling-niosh-lifting-2026
Citation
SmartQHSE Ltd (2026). Manual Handling & NIOSH Revised Lifting Equation Reference 2026 [dataset]. Zenodo. https://doi.org/10.5281/zenodo.20446741
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Published for reference, training, and research. Consult authoritative sources before operational or compliance decisions. SmartQHSE Ltd accepts no liability for errors or omissions.
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