Whole Person Impairment (WPI) Calculator

Estimate your WPI

State-specific WPI calculators: NSW · Victoria · Queensland · South Australia

What is whole person impairment?

Whole Person Impairment (WPI) is a numerical rating, expressed as a percentage from 0 to 100, that represents the permanent loss of whole-body function caused by an injury or illness after maximum medical improvement has been reached. A 0% WPI means no permanent impairment; a 100% WPI represents total loss of function.

WPI matters because it gates access to large categories of compensation. Many Australian compensation schemes use WPI thresholds to determine:

• Whether you can recover lump-sum damages for pain and suffering
• The amount of lump-sum permanent impairment compensation
• Whether you can pursue a common-law (negligence) claim against an employer or insurer
• Eligibility for ongoing weekly benefits past statutory caps
• Access to lifetime care schemes for catastrophic injuries

How is WPI calculated?

WPI is calculated by an accredited medical assessor - typically an occupation-relevant specialist (orthopaedic surgeon for spine, neurologist for brain injury, psychiatrist for mental health, etc.) who has been trained in the relevant impairment Guide. The process:

1. Establish maximum medical improvement (MMI). Your prognosis must have stabilised before WPI can be assessed. Premature assessment understates true impairment.
2. Examine each affected body region. The assessor follows structured chapter-by-chapter assessments in the Guide.
3. Apply objective and clinical measurements. Range of motion, strength, neurological deficit, imaging findings, treating clinician records.
4. Apportion pre-existing components. Any pre-existing impairment must be subtracted.
5. Combine multiple impairments. Where multiple body regions are affected, the Combined Values Chart is used (not simple addition).
6. Document the assessment. A formal medico-legal report explains the rating, methodology, and exclusions.

The AMA Guides explained

The American Medical Association's Guides to the Evaluation of Permanent Impairment ("AMA Guides") is the international standard for impairment assessment, and the foundation document for nearly every Australian compensation scheme's impairment methodology. Different states have adopted different editions:

Different editions and modifications can produce different WPI ratings for the same injury. This is one reason "what's my WPI?" doesn't have a single answer - it depends on which scheme is assessing you.

WPI thresholds by state

Most Australian schemes have WPI thresholds that gate compensation entitlements:

• NSW workers compensation - 11% WPI minimum for lump-sum permanent impairment compensation; 15% WPI threshold for common-law damages.
• NSW motor accidents (CTP) - 10% WPI threshold for non-economic loss damages.
• VIC workers compensation - 10% WPI for impairment benefits; "serious injury" gateway (30% psychiatric WPI or specific other tests) for common-law damages.
• VIC TAC - 30% physical or 30% psychiatric WPI for impairment benefit; "serious injury" for common-law damages.
• QLD workers compensation - 1% DPI minimum for lump sums; common-law claims gateway differs.
• WA workers compensation - 15% WPI threshold for common-law damages.
• SA workers compensation - 5% WPI minimum threshold for lump sums.
• TAS workers compensation - 5% WPI minimum.
• Comcare - 10% WPI minimum.

WPI payouts by state

WPI percentages translate into lump-sum compensation differently in each scheme. Approximate scales as at 2024-25 (always check current published amounts; rates CPI-index annually):

NSW workers compensation lump sum (Section 66)

For 15%+ WPI you can also pursue common-law work injury damages on top of the lump sum, which can run into seven figures for serious cases.

VIC workers compensation Impairment Benefits

• 10-19% WPI: $30,000 - $80,000 (approximate)
• 20-29% WPI: $80,000 - $160,000
• 30%+ WPI (serious injury): typically opens common-law damages, which can run from $100,000 to seven figures

QLD workers compensation lump sum

• 1-10% DPI: $5,000 - $50,000 (broadly)
• 11-20% DPI: $50,000 - $130,000
• 21-50% DPI: $130,000 - $400,000
• 50%+ DPI: $400,000+ plus common-law damages

SA workers compensation

• 5-10% WPI: lump sum from approximately $10,000
• 11-30% WPI: $50,000 - $250,000
• 30%+ WPI ("seriously injured worker"): lifetime medical, income support and lump-sum damages

Psychiatric WPI

Psychiatric WPI - assessment of mental health impairment - follows different methodology in each scheme. NSW workers compensation uses the PIRS (Psychiatric Impairment Rating Scale) developed for SIRA. VIC TAC uses GEPIC (Guide to the Evaluation of Psychiatric Impairment for Clinicians). QLD uses GEPI 2nd edition.

Psychiatric WPI thresholds in some schemes are higher than physical (e.g. VIC's 30% psychiatric WPI gateway) and the assessment process is fundamentally different - it relies on functional impact across six domains (self-care, social functioning, recreational activities, travel, employability, concentration) rather than range-of-motion or imaging findings. Detailed treating-psychiatrist evidence carries enormous weight.

Combining multiple impairments

Where you have impairment in multiple body regions (e.g. back and shoulder, or physical and psychiatric), the AMA Guides specify a combined formula rather than simple addition. The formula uses the Combined Values Chart - effectively, two 20% WPI impairments combine to 36% (not 40%), because each subsequent impairment is applied to the remaining unimpaired body function.

For psychiatric impairment, most Australian schemes do not combine physical and psychiatric WPI - they're assessed and paid separately. This is critical: if you have a 25% physical WPI and a 25% psychiatric WPI, you may be entitled to two separate lump sums rather than one combined assessment.

Maximising your WPI

• Wait for medical stability. Premature WPI assessment understates true impairment. Work with your treating doctors to confirm prognosis is stable before formal assessment.
• Choose the right assessor. Each scheme has accredited assessor lists. Specialist personal injury lawyers know which assessors produce balanced reports for which conditions.
• Document treatment thoroughly. Treating doctor reports, specialist letters, imaging, neuropsychological testing - all feed the assessor's clinical findings.
• Address all body regions. Don't assess just the most obvious injury - secondary impacts (e.g. depression secondary to chronic pain, knee injury from spinal compensation patterns) often add WPI percentage points.
• Get a second opinion if borderline. A 14% WPI rating in NSW is fundamentally different from a 15% WPI - the difference between no common-law claim and a major one. Where ratings sit on a threshold, dispute pathways are worth using.
• Address pre-existing condition apportionment carefully. Have specialist medical evidence framing accident-caused symptoms vs pre-existing baseline; otherwise insurer-friendly apportionment will dominate.

This calculator is an indication only. Real WPI percentages depend on detailed clinical findings and the specific assessment Guide used in your state. The AMA Guides are highly technical; pre-assessment estimates can vary significantly from actual outcomes. Use this number as a sense check, not a target.