VA Combined Disability Calculator
If you have multiple VA disability ratings, simply adding the percentages together usually does not produce your combined VA disability rating. The Department of Veterans Affairs uses a combined ratings method in which each additional disability is applied to the portion of the body that is considered remaining efficient.
The VA Combined Disability Calculator provides a convenient way to estimate a combined percentage from multiple individual ratings. It accepts up to six disability ratings, arranges them from highest to lowest, combines them sequentially, and rounds the final result to the nearest 10%.
The calculator also includes an option labeled Bilateral Factor for paired extremities. However, its bilateral calculation is a simplified estimate and should not be treated as an exact reproduction of the VA’s official bilateral-factor procedure.
What Is a VA Combined Disability Rating?
A VA combined disability rating represents the combined effect of multiple service-connected disabilities.
The important point is that VA disability percentages are not simply additive. For example, a 60% rating and a 20% rating do not simply become 80%. VA explains that its combined-rating system accounts for the remaining efficiency after the first disability is considered.
VA’s official process first arranges disabilities from highest to lowest and then combines them using the Combined Ratings Table. When more than two disabilities are involved, VA continues combining the unrounded intermediate result with each additional rating before applying the final rounding.
This is sometimes referred to as VA math.
How to Use the VA Combined Disability Calculator
The calculator allows you to enter between two and six disability ratings.
Step 1: Enter Your First Disability Rating
Enter your highest disability rating in the first field.
For example:
Rating 1 = 60%
Although the calculator sorts all entered ratings automatically, starting with your highest rating makes the inputs easier to review.
Step 2: Enter Your Second Rating
Enter your second disability percentage.
For example:
Rating 2 = 30%
At least two ratings are required by the calculator.
Step 3: Add Additional Ratings
You can optionally enter a third, fourth, fifth, or sixth rating.
For example:
- 60%
- 30%
- 20%
- 10%
The calculator automatically sorts the entered values from highest to lowest before combining them.
Step 4: Select the Bilateral Factor Option
The calculator provides two choices:
- No
- Yes — for paired extremities
If you select Yes, the calculator applies its simplified bilateral calculation after combining the ratings.
Because the official VA bilateral factor has specific eligibility and calculation rules, this option should be considered an estimate rather than a substitute for the VA’s official calculation.
Step 5: Calculate Your Combined Rating
Click Calculate to see:
- Combined VA Rating
- Rounded VA Rating
- Number of Ratings
- Bilateral Factor status
- Efficiency Remaining
How VA Math Works
The basic mathematical concept used by this calculator is:
Combined Rating = Existing Combined Rating + (Remaining Efficiency × Next Rating ÷ 100)
After applying a disability rating, the remaining efficiency is:
Remaining Efficiency = 100 − Combined Rating
For example, suppose you have:
- 60% disability
- 20% disability
Start with the 60% rating.
That leaves:
100 − 60 = 40% remaining efficiency
The 20% disability is then applied to that remaining 40%:
40 × 20% = 8%
Add that to the original 60%:
60 + 8 = 68%
The calculator therefore produces an unrounded combined value of 68% before final rounding.
VA’s official Combined Ratings Table likewise gives 68 as the combined value for 60% and 20%, which is then rounded to 70% for the final combined rating.
Why VA Ratings Are Not Added Together
One of the most important concepts to understand is that VA uses a diminishing-efficiency approach.
Consider two ratings of 50% and 30%.
Simple addition would produce:
50% + 30% = 80%
But VA math works differently.
Start with 50%, leaving:
100 − 50 = 50% efficiency
Apply 30% of that remaining 50%:
50 × 0.30 = 15%
Then:
50 + 15 = 65%
The official VA Combined Ratings Table gives a combined value of 65% for these two ratings. VA then rounds 65% to 70% for the final combined disability rating.
This illustrates why adding individual percentages together can produce a different result from the VA’s combined rating.
Combining Three or More Disabilities
When you have more than two disabilities, the process continues sequentially.
Suppose the ratings are:
- 60%
- 40%
- 20%
First combine 60% and 40%.
The remaining efficiency after 60% is 40%.
Then:
40 × 40% = 16%
So:
60 + 16 = 76%
Now combine the unrounded 76% with the 20% rating.
Remaining efficiency:
100 − 76 = 24%
Apply the 20% rating:
24 × 20% = 4.8%
Then:
76 + 4.8 = 80.8%
The calculator displays 80.8% as the combined result and rounds it to the nearest 10%, producing 80%.
This sequential approach is consistent with the general VA process of using the unrounded combined value for subsequent disabilities before the final rounding step.
Why Ratings Are Sorted From Highest to Lowest
The calculator automatically sorts your ratings in descending order.
For example, if you enter:
- 20%
- 60%
- 10%
- 40%
the calculator processes them as:
60%, 40%, 20%, 10%
This matters because the combined-rating calculation is based on applying each additional percentage to the remaining efficiency after the previous ratings have been considered.
VA also describes its process as arranging disabilities in order of severity, beginning with the greatest disability.
Understanding the Rounded VA Rating
The calculator provides two different values:
Combined VA Rating
This is the calculated value before final rounding, displayed to one decimal place.
For example:
80.8%
Rounded VA Rating
This is the combined value rounded to the nearest 10%.
For example:
80.8% → 80%
The VA explains that the final combined value is rounded to the nearest 10%, with values ending in 1 through 4 rounded down and values ending in 5 through 9 rounded up.
The calculator uses standard JavaScript rounding for its final result.
What Is Efficiency Remaining?
The calculator also shows Efficiency Remaining.
The formula is:
Efficiency Remaining = 100 − Combined Rating
For example, if the unrounded combined rating is 68%:
100 − 68 = 32%
The calculator therefore displays:
Efficiency Remaining = 32%
This number helps explain the logic behind VA math. Each additional disability percentage is applied to the remaining efficiency rather than simply being added to the original percentage.
Understanding the Bilateral Factor
The calculator includes a bilateral-factor option for disabilities involving paired extremities.
The purpose of the VA bilateral factor is to account for certain disabilities affecting both arms, both legs, or paired extremities. However, the actual VA rules involve determining which disabilities qualify, combining the applicable disabilities, and then applying the bilateral factor according to the applicable regulations.
The calculator does not reproduce that full process.
Instead, its simplified calculation takes the combined rating and adds 10% of that combined value:
Bilateral Addition = Combined Rating × 0.10
Then:
Adjusted Combined Rating = Combined Rating + Bilateral Addition
For example, if the calculator has already produced 60% and the bilateral option is selected:
60 × 0.10 = 6%
Then:
60 + 6 = 66%
The calculator would report 66% before final rounding.
Because this is a simplified implementation, users should verify bilateral-factor eligibility and the resulting calculation against the official VA rules.
Worked Example: Three VA Disability Ratings
Suppose a veteran enters:
- Rating 1: 60%
- Rating 2: 40%
- Rating 3: 20%
- Bilateral Factor: No
The calculator sorts the ratings:
60%, 40%, 20%
First combination
Start with 60%.
Remaining efficiency:
100 − 60 = 40%
Apply the 40% rating:
40 × 0.40 = 16
Combined value:
60 + 16 = 76%
Second combination
Remaining efficiency:
100 − 76 = 24%
Apply the 20% rating:
24 × 0.20 = 4.8
Combined value:
76 + 4.8 = 80.8%
Final result
The calculator displays:
- Combined VA Rating: 80.8%
- Rounded VA Rating: 80%
- Number of Ratings: 3
- Bilateral Factor: No
- Efficiency Remaining: 19.2%
The official VA example for 60%, 40%, and 20% similarly produces a combined value of 81% through the Combined Ratings Table and a final rounded rating of 80%.
Small differences in intermediate values can occur because the calculator uses direct mathematical calculations while VA’s official process uses its Combined Ratings Table.
VA Combined Rating vs. Simple Addition
It’s helpful to compare the two approaches.
| Individual Ratings | Simple Addition | VA-Style Combined Calculation |
|---|---|---|
| 50% + 30% | 80% | 65% |
| 60% + 20% | 80% | 68% |
| 40% + 20% | 60% | 52% |
| 60% + 40% | 100% | 76% |
The difference comes from applying each additional disability to the remaining efficiency rather than adding every percentage directly.
For example, VA specifically gives 50% plus 30% as a 65% combined value before final rounding, resulting in a 70% combined rating.
How Many Ratings Can the Calculator Handle?
This calculator accepts up to six disability ratings.
The first two fields are required. Ratings three through six are optional.
Any optional rating entered as zero or left blank is not added to the list of ratings being combined.
The calculator then sorts all valid ratings from highest to lowest.
What Does a 100% Combined Rating Mean?
A rounded 100% combined disability rating is the highest combined disability percentage used in the standard VA disability-rating scale.
However, the calculator’s mathematical result should not be confused with a determination by VA about your actual entitlement.
VA determines individual disability ratings based on the evidence associated with a claim, including evidence provided by the claimant and, when applicable, the results of a VA claim examination.
For current compensation amounts, the applicable rate also depends on factors such as dependent status. VA publishes current compensation tables separately from the combined-rating calculation.
Why Your VA Calculator Result May Differ From Your VA Decision
A calculator can help explain the mathematical combination of percentages, but your official VA result can depend on details that aren’t represented by this simple calculator.
Potential reasons include:
- The exact disabilities considered
- Individual VA-assigned ratings
- Effective dates
- Special rating provisions
- Bilateral-factor eligibility
- Other regulatory rules
- Additional conditions or circumstances
- VA’s official Combined Ratings Table
The Department of Veterans Affairs provides an online way for veterans with finalized disability decisions to view their individual ratings and combined rating.
Therefore, use a calculator as an educational estimate rather than as a replacement for your official VA decision or records.
Tips for Using a VA Combined Disability Calculator
For the most useful estimate:
- Enter each individual VA disability percentage separately.
- Don’t simply add the percentages together.
- Enter all applicable ratings rather than entering a previously combined rating as another individual disability.
- Allow the calculator to sort the ratings from highest to lowest.
- Check whether the bilateral-factor option actually applies to your circumstances.
- Compare the calculated result with your official VA rating information.
- Use official VA resources when determining compensation amounts or eligibility.
VA confirms that veterans can view their individual ratings and combined disability rating online after receiving a decision notice.
Frequently Asked Questions
1. What is a VA combined disability rating?
A VA combined disability rating represents the combined percentage assigned when a veteran has multiple service-connected disabilities. VA does not simply add the individual percentages together.
2. Why doesn’t VA simply add disability percentages?
VA uses a whole-person approach in which each additional disability is applied to the remaining efficiency after previous disabilities have been considered.
3. How does VA math work?
The general calculation starts with the highest rating and applies each subsequent rating to the remaining efficiency. The final combined value is then rounded to the nearest 10%.
4. Do VA disability ratings get rounded?
Yes. VA ultimately rounds the final combined value to the nearest 10%. Intermediate values are used before the final rounding when multiple disabilities are involved.
5. How many disability ratings can this calculator combine?
This calculator accepts up to six individual ratings. The first two are required, while the remaining four are optional.
6. Does the order of my ratings matter?
The calculator automatically sorts the ratings from highest to lowest. This follows the general ordering used by VA when combining multiple disability ratings.
7. What is the bilateral factor?
The bilateral factor is a VA provision that can apply in certain situations involving disabilities of paired extremities. Eligibility and calculation requirements are more specific than simply adding 10% to a combined rating.
8. Is the bilateral factor in this calculator exact?
No. This calculator uses a simplified method that adds 10% of the calculated combined value when the bilateral option is selected. It should not be treated as an exact reproduction of the official VA bilateral-factor calculation.
9. What is efficiency remaining?
Efficiency remaining represents the portion left after the calculated combined disability percentage. For example, a 70% combined value leaves 30% efficiency.
10. Can I add my VA ratings together manually?
You can add them for a basic comparison, but simple addition does not reproduce VA’s combined-rating method. For example, VA states that 60% and 20% combine to 68% before final rounding rather than 80%.
11. What happens when I have three or more disabilities?
VA continues the calculation using the unrounded combined value and the next disability rating. The process continues until all disabilities have been included, after which the final value is rounded.
12. Does a 60% and 40% disability rating equal 100%?
No. Using VA’s combined-rating method, 60% and 40% produce a combined value of 76%, which is ultimately rounded to 80%.
13. Can this calculator tell me my VA compensation amount?
No. It estimates a combined rating. Compensation amounts depend on the applicable VA compensation table and factors such as dependent status.
14. Where can I see my official VA disability rating?
VA provides an online tool where eligible veterans can view their individual disability ratings and combined rating after receiving a decision notice.
15. Is this calculator an official VA calculator?
No. It is an independent estimation tool. For an official determination, rely on your VA decision and records and consult VA’s current information and tools.
Final Thoughts
The VA Combined Disability Calculator can help explain why multiple disability percentages don’t simply add together. Its calculation applies each additional rating to the remaining efficiency, producing a combined value that is then rounded to the nearest 10%.
For example, 60% and 20% produce a 68% mathematical combination rather than 80% through simple addition, with the final VA rating rounded to 70%. VA’s official Combined Ratings Table follows this same general concept.
The calculator can be particularly useful for understanding how multiple ratings interact, but its simplified bilateral-factor calculation is not a substitute for the official VA rules. For your actual disability rating and compensation, use your official VA records and current VA resources.