Risk Calculator

Ergonomic Risk Assessment

NIOSH Lifting Equation · RULA · REBA

Employee and assessment details

Employee name

Employee ID

Company

Job title / department

Assessor name

Assessment date

Task / activity observed

NIOSH Revised Lifting Equation

Enter the observed lifting conditions. Distances are in centimetres, load in kilograms and frequency in lifts per minute.

Load lifted (kg)

Horizontal distance H (cm)

Hand height V (cm)

Vertical travel D (cm)

Asymmetry angle A (degrees)

Lifts per minute

Task duration

Hand-to-object coupling

Work posture

One-handed lifting (outside standard equation assumptions)

Calculate to display results.

The Revised NIOSH Lifting Equation applies only when its assumptions are met. This calculator uses a simplified frequency-multiplier lookup and is not a substitute for the official NIOSH worksheet, particularly for unusual tasks, one-handed lifting, carrying, pushing, pulling or unstable loads.

RULA — Rapid Upper Limb Assessment

Follow the RULA worksheet: select the observed posture for each body part and tick any adjustments. The tool applies the adjustments and looks up Table A, Table B and Table C to produce the final score. Assess the side of the body (left or right) that is under the greater load.

Group A — Arm and wrist

Upper arm position

Shoulder raised

Upper arm abducted (away from body)

Arm supported or person leaning

Lower arm position

Lower arm working across midline or out to the side

Wrist position

Wrist bent away from midline (deviation)

Wrist twist

Muscle use — arm and wrist

Force / load — arm and wrist

Group B — Neck, trunk and legs

Neck position

Neck twisted

Neck side-bending

Trunk position

Trunk twisted

Trunk side-bending

Legs and feet

Muscle use — neck, trunk and legs

Force / load — neck, trunk and legs

Calculate to display results.

Based on the RULA employee assessment worksheet (McAtamney and Corlett, 1993). Posture angles must be judged by the assessor from observation or photographs. This is a screening aid and should be reviewed by a competent assessor.

REBA — Rapid Entire Body Assessment

Select the observed posture scores and modifiers. Use the official REBA worksheet to determine the correct posture scores from observed joint angles.

Group A — Neck, trunk and legs

Neck score (1–3)

Trunk score (1–5)

Legs score (1–4)

Load / force

Shock / rapid force

Group B — Upper limbs

Upper arm score (1–6)

Lower arm score

Wrist score (1–3)

Coupling quality

Activity modifiers

Static posture held over 1 minute

Repeated small movements (>4/min)

Rapid large posture change / unstable base

Calculate to display results.

REBA requires observation of neck, trunk, legs, upper arm, lower arm, wrist, load, coupling and activity. The selectors are simplified scoring inputs; verify each score against the official REBA worksheet before relying on the result.

Report

Open the assessment tab you want to include, enter the inputs and click Calculate, then export. The PDF opens in a new browser window; choose Print → Save as PDF.