Quick Answer: VA combined ratings do not add up like regular math. The VA uses the “Whole Person” method — each new rating applies to your remaining healthy percentage, not the full 100%. This is why a veteran with a 50% rating and a 50% rating ends up at 75%, not 100%.
Why VA Math Doesn’t Work Like Regular Math
The most common shock veterans experience when reading their rating decision is this: they added up all their conditions and expected a certain number — then got something completely different from the VA. That confusion almost always comes from not understanding the VA’s combined ratings formula, codified in 38 CFR Part 4.
The VA does not add percentages together. Instead, the VA treats you as a whole person — 100% — and each disability “uses up” a portion of your remaining health. Once you understand the system, you can use it strategically to maximize your rating.
How the VA Combined Ratings Formula Works Step by Step
Step 1: Start With Your Highest Rating First
The VA always starts with your highest-rated disability. Let’s say that’s 50%. You now have 50% of your “whole person” remaining (100% – 50% = 50% remaining).
Step 2: Apply the Second Rating to the Remaining Percentage
Your second disability is rated 30%. The VA applies 30% to your remaining 50%, not to 100%. So: 30% of 50% = 15%. Your combined value is now 50% + 15% = 65%.
Step 3: Repeat for Each Additional Condition
You have a third condition rated 10%. Your remaining percentage is now 35% (100% – 65% = 35%). Apply 10% to 35%: 10% of 35% = 3.5%. Combined value: 65% + 3.5% = 68.5%.
Step 4: Round to the Nearest 10%
The VA rounds your final combined value to the nearest 10%. Values ending in 5 round up. So 68.5% rounds to 70%. Your official VA rating: 70%.
| Step | Condition | Individual Rating | Combined Value |
|---|---|---|---|
| 1 | PTSD | 50% | 50% |
| 2 | Lower Back | 30% | 65% |
| 3 | Tinnitus | 10% | 68.5% |
| Final | — | — | 70% (rounded) |
The Bilateral Factor: The Hidden Rating Booster
If you have service-connected disabilities in paired extremities — both arms, both legs, or a combination — the VA applies a bilateral factor before combining with other ratings. The bilateral factor adds 10% of the combined bilateral rating to your total before rounding.
Example: Left knee at 10% + Right knee at 10% = Combined bilateral value of 19% (10% of 19% = 1.9, added to get 20.9%, rounds to 21%). That 21% then enters the combined ratings table with your other conditions.
Why This Matters for Your Rating Strategy
Because of diminishing returns in the VA formula, adding low-rated conditions when you already have a high combined rating has less impact than adding them when your rating is lower. A 10% condition added to a 90% combined value only adds 1% (10% of 10% remaining). The same 10% condition added to a 50% combined value adds 5%.
This is why veterans with high combined ratings often pursue TDIU or additional high-value ratings (30%+) rather than stacking more 10% conditions. Accredited VSOs can help you identify which conditions to prioritize for maximum impact — and they do so at no charge.
Frequently Asked Questions About VA Combined Ratings
Why did I get 70% when I added up my ratings and got 90%?
Because the VA uses the Whole Person method, not simple addition. Each rating applies to your remaining health percentage, not to the original 100%. Your combined value will always be less than the sum of individual ratings.
Is there a VA combined ratings calculator I can use?
Yes. The VA’s official combined ratings table is available in 38 CFR Part 4, Appendix A. Several free online calculators simulate the Whole Person method — including the calculator at VA.gov. Always verify your calculation against the official table.
How many conditions can I claim?
There is no limit on the number of service-connected conditions you can claim. File every condition that is connected to your service. Even conditions rated at 0% can be important — they create a permanent service connection record and can be increased later if the condition worsens.
What is a 0% service-connected rating?
A 0% rating means the VA has recognized your condition as service-connected but determined it is not currently severe enough to warrant compensation. It does not pay monthly benefits, but it establishes the connection — meaning if the condition worsens, you can file for an increase without re-proving service connection.