Free Parkinson’s assessment calculators
Track Parkinson’s with validated calculators, free. Rate motor and daily-living function, quality of life, cognition, and tremor, and check the evidence behind each one.
How common is Parkinson’s disease?
About 1 in 100 people over 60 have Parkinson’s disease.
An estimated 1.1 million people in the United States are living with Parkinson’s now, a figure expected to reach 1.2 million by 2030, with nearly 90,000 newly diagnosed each year.1Worldwide, more than 8.5 million people have Parkinson’s, and the risk rises sharply with age.2
- 1.Parkinson’s Foundation. Parkinson’s Prevalence Project (2018) and Incidence study (2022).
- 2.World Health Organization. Parkinson disease fact sheet (GBD 2019).
Understanding Parkinson’s
Parkinson’s disease develops as certain brain cells that help control movement are gradually lost. It can cause tremor, stiffness, slowness, and changes in balance, alongside non-motor effects on sleep, mood, and thinking. Because it progresses, these calculators are repeated to measure change.
They rate motor and daily-living function, quality of life, and cognition. A related movement disorder, essential tremor, has its own rating scale.
Parkinson’s assessment calculators
Each one is free. Open it to take the assessment, get a score, and see what it measures and the evidence behind it.
Motor and daily living
Parkinson’s questions, answered
Which scale is used to rate Parkinson's disease?
The MDS-UPDRS, the Movement Disorder Society Unified Parkinson's Disease Rating Scale. It has four parts. Part I covers non-motor experiences of daily living, Part II motor experiences of daily living, Part III the clinician's motor examination, and Part IV motor complications of treatment. Each part is summed on its own rather than into a single total. Part III is the part most often quoted on its own in trials.
How is Parkinson's disease severity measured?
By repeating the same rating scale over time and reading the change. A 2015 study of 452 people proposed severity bands for each part of the MDS-UPDRS. On Part III, the motor examination, up to 32 is mild, 33 to 58 is moderate, and 59 or more is severe. The bands are reference information for the care team, not a diagnosis, and a neurologist reads them alongside the examination.
Where does the official MDS-UPDRS PDF come from?
From the International Parkinson and Movement Disorder Society, which owns the copyright and publishes the form at movementdisorders.org. Anyone administering the scale themselves requests permission through the society's form. The society also runs a certificate program that trains raters to administer it. The pages here describe what each part covers rather than reproducing the licensed form.
What is the difference between Parkinson's disease and essential tremor?
They are separate movement disorders. Parkinson's disease involves the loss of brain cells that help control movement and produces slowness, stiffness, and changes in balance alongside tremor. Essential tremor is a tremor disorder without that wider picture. They are rated with different instruments. Parkinson's uses the MDS-UPDRS, and essential tremor uses scales such as the TETRAS.
Are these Parkinson's calculators free?
Yes. Every calculator here is free to take, and each page shows what the instrument measures, how it is scored and administered, the published evidence behind it, and who publishes it.
Do these calculators diagnose Parkinson's disease?
No. They produce reference information for you and your care team. Diagnosis stays with a clinician, usually a neurologist.
Can a brain-computer interface help with Parkinson’s disease?
The Brain-Computer Interface Registry connects people with Parkinson’s to trials building new ways to move and communicate. Complete your assessments once, and be matched to trials as they open.
These calculators use validated instruments and are reference information, not a diagnosis.