VA Math for Veterans โ Expanded Guide
Welcome to the extended version of VA Math 101! If you thought this was going to be as simple as basic addition, think again. But donโt worryโweโll walk through it step by step, adding more examples, tips, and tricks to ensure youโre a VA Math expert by the end of this guide.

VA Math is the system the VA uses to combine multiple disability ratings into aย Total Combined VA Disability Rating, which determines your overall compensation. Remember,ย VA Math isnโt regular mathโyou donโt simply add percentages together. Instead, each condition is a percentage of what remains of your overall body after other conditions have been subtracted.
Your combined disability rating affects:
ย
- Monthly Compensation Amounts: Your total combined rating determines how much money you receive each month.
- Additional Benefits Eligibility: Some programs and benefits, such as VA housing grants or Special Monthly Compensation (SMC), require certain rating thresholds.
Letโs break down VA Math with a detailed explanation, using examples you can follow along with.
Imagine Robert has these conditions:
ย
- Knee injury: 30%
- Shoulder injury: 20%
- Back injury: 10%
ย
Step 1: Start with 100% (your whole body). Subtract the largest condition,ย 30%, leaving 70% remaining.
Step 2: Calculate the second condition (20%) as a percentage of the remaining 70%. Thatโsย 20% of 70 = 14. Subtract this from 70%, leaving 56%. Add 14% to the total combined rating:ย 30% + 14% = 44%.
Step 3: Calculate the third condition (10%) as a percentage of the remaining 56%. Thatโsย 10% of 56 = 5.6. Subtract this from 56%, leaving 50.4%. Add 5.6% to the combined rating:ย 44% + 5.6% = 49.6%.
Step 4: Round to the nearest 10%. Joeโs final combined rating isย 50%.
What happens when you have more than three conditions? Itโs the same processโjust keep going, one condition at a time.
Letโs say Dionne has:
ย
- Hip condition: 40%
- Knee injury: 30%
- Ankle sprain: 20%
- Back strain: 10%
ย
Step 1: Subtract the largest condition (40%) from 100%, leaving 60%.
Step 2: Calculateย 30% of 60%:ย 0.3 ร 60 = 18%. Subtract from 60%, leaving 42%. Add 18% to the combined rating:ย 40% + 18% = 58%.
Step 3: Calculateย 20% of 42%:ย 0.2 ร 42 = 8.4%. Subtract from 42%, leaving 33.6%. Add 8.4% to the combined rating:ย 58% + 8.4% = 66.4%.
Step 4: Calculateย 10% of 33.6%:ย 0.1 ร 33.6 = 3.36%. Subtract from 33.6%, leaving 30.24%. Add 3.36% to the combined rating:ย 66.4% + 3.36% = 69.76%.
Step 5: Round to the nearest 10%. Sarahโs final combined rating isย 70%.
Letโs say Darnell has:
ย
- Right foot condition: 20%
- Left foot condition: 10%
- Back condition: 40%
Step 1: Combine the bilateral conditions (right foot and left foot). Start with the larger condition (20%) and subtract it from 100%, leaving 80%.
Step 2: Calculateย 10% of 80%:ย 0.1 ร 80 = 8%. Add this:ย 20% + 8% = 28%.
Step 3: Apply theย Bilateral Factor. Addย 10% of 28%:ย 0.1 ร 28 = 2.8%. This makes the bilateral conditionsโ combined ratingย 30.8%. Round toย 31%.
Step 4: Combine the 31% bilateral rating with the back condition (40%):
ย
- Subtract 40% from 100%, leaving 60%.
- Calculateย 31% of 60%:ย 0.31 ร 60 = 18.6%. Add this:ย 40% + 18.6% = 58.6%.
ย
Step 5: Round to the nearest 10%. Jamesโs final combined rating isย 60%.
Now letโs see how the Bilateral Factor can significantly improve a rating. Diara has:
- Right shoulder: 20%
- Left arm: 20%
- Back injury: 10%
Without the Bilateral Factor:
- Combine 20% and 20%:ย 40%.
- Combine 40% with 10%:ย 46%, rounded down toย 40%.
With the Bilateral Factor:
- Combine the bilateral conditions first:
- Subtractย 20%ย from 100%, leaving 80%.
- Calculateย 20% of 80%:ย 16%. Combined:ย 20% + 16% = 36%.
- Apply the Bilateral Factor: Addย 10% of 36%:ย 3.6%. Combined:ย 36% + 3.6% = 39.6%, rounded toย 40%.
- Combine this with the back injury (10%):ย 39.6% + 6% = 45.6%, rounded toย 50%.
Diara final rating jumps fromย 40% to 50%โa huge difference in benefits!
- Rank Conditions by Severity: Always combine the highest-rated condition first.
- Use a Calculator: Donโt try to calculate percentages in your headโprecision matters!
- Check for Bilateral Conditions: Even a 0% rating in one limb can trigger the Bilateral Factor.
- Recheck the Math: Small errors in VA Math can lead to incorrect ratings.
- Ask for Help: If youโre unsure, contact a VA representative or a VSO (Veteran Service Organization).
The VA uses this formula because additional conditions donโt always add the same level of disability. For example, if youโre already limited by one condition, a second condition might not impact you as much as it would if you were otherwise healthy. VA Math helps ensure fair compensation based on total functionality.
What if I donโt agree with my combined rating?
If you think the VA calculated your combined rating incorrectly, you can appeal the decision. Be sure to review the Rating Decision and compare it to your own calculations.
Can the Bilateral Factor apply to non-paired conditions?
No, the Bilateral Factor only applies to conditions affecting opposite limbs (e.g., both arms or both legs).
What happens if my condition worsens?
You can file for an increased evaluation if your conditions have worsened. This may result in a higher overall rating.
Be Patient
While the process can take time, your persistence will pay off.
- VA Math is all about combining ratings step by step, starting with the highest percentage first.
- The Bilateral Factor can make a significant difference, so always check if it applies to your case.
- Practice calculating your own rating to ensure accuracy.
VA Math might be tricky, but with this guide and some practice, youโll be ready to calculate like a pro. Now grab your pencil, find your ratings, and show VA Math whoโs boss!
Be One of the First to Subscribe!
Donโt miss your chance to be part of the SentinelSyx community. Join the first 10,000 veterans and gain exclusive access to AI-powered support designed to simplify your VA benefits.