Understanding VA Disability Rating Math

The Department of Veterans Affairs (VA) does not simply add up your individual disability ratings to determine your total combined rating. Instead, VA uses a formula outlined in 38 CFR § 4.25, known as the "VA Combined Ratings Table." This method ensures no veteran can exceed a 100% disability rating, no matter how many conditions are service-connected.

For example, if you have two disabilities rated at 50% and 30%, your combined rating is not 80%. The VA first considers your most severe disability, then applies the next rating to the remaining "non-disabled" portion. This process continues for each additional rating.

Step-by-Step: How VA Combines Ratings

Here’s how the math works in practice:

  • Start with your highest rating. If you have a 50% disability, that leaves 50% "unaffected."
  • Apply the next highest rating to the remaining percentage. For a 30% disability, take 30% of the remaining 50% (which is 15%).
  • Add this to your original 50% (50% + 15% = 65%).
  • Round the total to the nearest 10%—so 65% becomes 70%.

This process repeats for each additional rating. You can use the VA Disability Rating Calculator to estimate your combined rating. For more details, visit our disability ratings hub.

How Many Ratings to Reach 100%?

There’s no fixed number of ratings needed to reach a 100% combined rating. The key factors are the size of each rating and how they interact. For example, two 50% ratings do not equal 100%. In fact, you typically need several high-percentage ratings to approach a 100% combined rating.

For instance, three ratings of 60%, 40%, and 30% combine to approximately 83%. You would need either a single very high rating (like 90% or 100%), or multiple ratings at 60% or higher, to get close to 100%. Check your situation with our calculator.

Filing and Appealing for Higher Ratings

To maximize your combined rating, file claims for all service-connected conditions using VA Form 21-526EZ. If you believe your combined rating is incorrect, you can file a Supplemental Claim (VA Form 20-0995) or a Notice of Disagreement (VA Form 10182) within one year of your decision letter.

If your conditions worsen, request an increase using VA Form 21-526EZ or file for Total Disability based on Individual Unemployability (TDIU) if you cannot work due to service-connected disabilities. Learn more about the claims process at our VA claims hub or explore our topic explainers.

Why 100% Matters: Compensation and Benefits

A 100% VA disability rating means you receive the maximum monthly compensation—$3,737.85 for a single veteran in 2026 (see VA compensation tables). You also qualify for additional benefits, such as full VA healthcare, dental care, and dependent allowances.

Reaching 100% can be life-changing, but it requires understanding VA math and diligent claim management. Review your ratings, gather medical evidence, and seek help from a Veterans Service Officer (VSO) if needed.