Multi-NIOSH Lift Calculator

Task 1
Vertical location (V1) cm
Vertical travel displacement (D1) cm
Horizontal location (H1) cm
Asymmetric angle torso (A1) °
Quality of grip hands (Cm1)
Work duration (d1)
Frequency multiplier (Fm1)
1 or 2 hands (Om1)
Actual mass1 kg

Task 2
Vertical location (V2) cm
Vertical travel displacement (D2) cm
Horizontal location (H2) cm
Asymmetric angle torso (A2) °
Quality of grip hands (Cm2)
Work duration (d2)
Frequency multiplier (Fm2)
1 or 2 hands (Om2)
Actual mass2 kg

Task 3
Vertical location (V3) cm
Vertical travel displacement (D3) cm
Horizontal location (H3) cm
Asymmetric angle torso (A3) °
Quality of grip hands (Cm3)
Work duration (d3)
Frequency multiplier (Fm3)
1 or 2 hands (Om3)
Actual mass3 kg

Task 4
Vertical location (V4) cm
Vertical travel displacement (D4) cm
Horizontal location (H4) cm
Asymmetric angle torso (A4) °
Quality of grip hands (Cm4)
Work duration (d4)
Frequency multiplier (Fm4)
1 or 2 hands (Om4)
Actual mass4 kg

Task 5
Vertical location (V5) cm
Vertical travel displacement (D5) cm
Horizontal location (H5) cm
Asymmetric angle torso (A5) °
Quality of grip hands (Cm5)
Work duration (d5)
Frequency multiplier (Fm5)
1 or 2 hands (Om5)
Actual mass5 kg

Population

1 or 2 persons (Pm)

Additional physical tasks (At)

Composite risk index (CRi)


Risk index 1 (Ri1)


Risk index 2 (Ri2)


Risk index 3 (Ri3)


Risk index 4 (Ri4)


Risk index 5 (Ri5)

The multi-task NIOSH calculator is based on the revised NIOSH lifting equation of 2021 and the European standard EN 1005-2.

The standard applies to lifting loads of at least 3 kg and to carrying loads less than 2 metres.

Quality of grip hands (Cm):
Good:
 - Load length <= 40 cm
 - Load height <= 30 cm
 - Good handles
 - Good hand-hold cut-outs

Fair:
 - Load length <= 40 cm
 - Load height <= 30 cm
 - Poor handles
 - Poor hand-hold cut-outs
 - 90° finger flexion

Poor:
 - Load length > 40 cm
 - Load height > 30 cm
 - Load hard to grasp
 - Asymmetric center of mass

Work duration (d):
Duration of all lifting tasks and rest periods in an 8-hour working day.

Frequency multiplier (Fm):
Number of lifts per minute.

Actual mass:
The weight of the load to be lifted.

Risk index (Ri):
- Ri <= 0.85
  Low risk. The risk may be regarded as tolerable.

- 0.85 < Ri < 1.0
  Significant risk. Action recommended.

- Ri >= 1.0
  High risk. Redesign is necessary.

Source:
- Revised NIOSH Lifting Equation 2021
- EN 1005-2: Human Physical Performance - Part 2