REBA Arm-Wrist Score Calculator

REBA arm/wrist measured component scores and caller independently verified12×3edition GroupBtable (lower-arm then upper-arm rows); muscle/load/grand score separate. Caller independently establishes matching units, evidence, method edition and applicability; output is not compliance, diagnosis, work-safety approval, geological identity or validated hazard prediction.

Description

Rapid Entire Body Assessment (REBA) arm and wrist components encode observed joint positions and additional conditions.

Rapid Entire Body Assessment (REBA) arm and wrist components encode observed joint positions and additional conditions.^[1]

Combining those components needs a specified Group B table, which this tool requires from the caller. Use this tool to calculate REBA Arm-Wrist Score from the supplied measurements and assumptions.

When to use REBA Arm-Wrist Score Calculator

Use this tool to calculate REBA Arm-Wrist Score from the supplied measurements and assumptions. Establish the observation protocol, units, task and reference population or review criterion before entering measurements.

How to use REBA Arm-Wrist Score Calculator and understand its results

Establish the observation protocol, units, task and reference population or review criterion before entering measurements.
Enter upperArmDegrees, lowerArmDegrees, wristDegrees, shoulderRaised, armAbducted, armSupported, wristTwisted, callerVerifiedGroupBTable, using the field meanings and rules below, then run the tool.
Read upperArmScore, lowerArmScore, wristScore, callerGroupBScore. Interpret the fields using their units, signs and evidence conventions below.
If input validation fails, correct the reported field and run again. Before applying the result, check reference scope, model assumptions and any missing evidence or placeholder values.

Input field	Meaning	Value type	Requirement
upperArmDegrees	Upper arm degrees	number	Required
lowerArmDegrees	Lower arm degrees	number	Required
wristDegrees	Wrist degrees	number	Required
shoulderRaised	Shoulder raised	boolean	Required
armAbducted	Arm abducted	boolean	Required
armSupported	Arm supported	boolean	Required
wristTwisted	Wrist twisted	boolean	Required
callerVerifiedGroupBTable	Caller verified group b table; caller assertion or measurement requiring independent evidence	list of list of number	Required

Enter upper-arm angle −90..180, lower-arm angle 0..180 and wrist angle with magnitude≤90 degrees plus explicit posture modifiers. Upper-arm base is 1 at −20..20, 2 below −20 or above 20..45, 3 above 45..90 and 4 above 90; raised and abducted add one each, supported subtracts one with minimum 1. Lower-arm base is 1 at inclusive 60..100, else 2; wrist base is 1 at magnitude≤15, else 2, plus twist. Supply a 12×3 Group B table of integer values 1..100. Row ordinal is (lower−1)×6+upper and column is wrist, both one-based; return components and the selected caller table value.

row=(lowerArmScore−1)×6+upperArmScore; groupB=callerTable[row−1][wristScore−1]

Use the exact units, boundary rules, ordering and missing-evidence conventions above.

Output field	Meaning	Value type
upperArmScore	Upper Arm Score; follow the units, sign, ordering and evidence convention stated above	number
lowerArmScore	Lower Arm Score; follow the units, sign, ordering and evidence convention stated above	number
wristScore	Wrist Score; follow the units, sign, ordering and evidence convention stated above	number
callerGroupBScore	Caller Group B Score; follow the units, sign, ordering and evidence convention stated above	number

json

{
  "input": {
    "upperArmDegrees": 50,
    "lowerArmDegrees": 80,
    "wristDegrees": 20,
    "shoulderRaised": true,
    "armAbducted": false,
    "armSupported": false,
    "wristTwisted": true,
    "callerVerifiedGroupBTable": [
      [
        1,
        2,
        3
      ],
      [
        2,
        3,
        4
      ],
      [
        3,
        4,
        5
      ],
      [
        4,
        5,
        6
      ],
      [
        5,
        6,
        7
      ],
      [
        6,
        7,
        8
      ],
      [
        2,
        3,
        4
      ],
      [
        3,
        4,
        5
      ],
      [
        4,
        5,
        6
      ],
      [
        5,
        6,
        7
      ],
      [
        6,
        7,
        8
      ],
      [
        7,
        8,
        9
      ]
    ]
  },
  "output": {
    "upperArmScore": 4,
    "lowerArmScore": 1,
    "wristScore": 3,
    "callerGroupBScore": 6
  }
}

Limitations and assumptions

Combining those components needs a specified Group B table, which this tool requires from the caller. Interpretation depends on the units, sampling scope and exact model described above.

All listed fields require explicit values. Unexpected fields, incorrect types, nonfinite numbers and sparse evidence arrays fail validation; the specific bounds and alignment requirements are stated above. Extremely large inputs or outputs can also be rejected. An input error is distinct from a successful result reporting false, no matches or missing evidence.

Alternative or Complementary methods

Use REBA Activity Coupling Adjuster Calculator for this related task: Coupling and activity indicators are separate REBA adjustments.

Use REBA Trunk Score Calculator when its separate inputs and assumptions fit the question: REBA uses observed trunk posture and additional movement indicators to form a component score.

References

REBA Arm-Wrist Score Calculator — tool.io

Similar or alternative tools

REBA Activity Coupling Adjuster Calculator
Coupling and activity indicators are separate REBA adjustments.
REBA Trunk Score Calculator
REBA uses observed trunk posture and additional movement indicators to form a component score.