VA Disability Rating Calculator: How VA Math Actually Works (2026)

If you've ever tried to add up your VA disability percentages and gotten a number that doesn't match what the VA pays you, you're not doing the math wrong. The VA uses a specific formula — called the combined ratings formula or "VA math" — that produces results most veterans find counterintuitive until they see how it works.

Why the VA doesn't add ratings together

The VA treats your body as a "whole person" worth 100%. Each service-connected condition takes a percentage of that whole person — but subsequent conditions apply only to what's left, not to the original 100%.

This concept comes from 38 CFR § 4.25, the federal regulation governing combined ratings. The VA calls it the "whole person concept." The result is that adding more conditions produces diminishing returns in your combined rating.

Step-by-step example: 50% + 30% + 10%

Here's how the VA calculates a veteran with three ratings of 50%, 30%, and 10%:

1. Start at 100% healthy. Apply the highest rating first: 50% of 100% = 50% disabled. You now have 50% remaining.
2. Apply the next rating to what's left: 30% of 50% = 15% additional disability. Combined so far: 50% + 15% = 65%.
3. Apply the final rating to what remains: 10% of 35% = 3.5% additional disability. Combined so far: 65% + 3.5% = 68.5%.
4. Round to the nearest 10%: 68.5% rounds up to 70% (the VA rounds .5 and above up).

So 50% + 30% + 10% = 70% combined rating, not 90%.

The bilateral factor (38 CFR § 4.26)

There's one place where VA math actually works in your favor. If you have service-connected conditions affecting paired extremities — both knees, both shoulders, both hands — the VA applies a "bilateral factor" before combining those ratings with your other conditions.

How it works: the bilateral conditions are first combined using VA math, then 10% of that combined value is added as a bonus. For example, a 20% right knee and a 20% left knee combine to 36% using VA math. The bilateral factor adds 10% of 36% = 3.6%, bringing the bilateral total to 39.6%, which rounds to 40% before combining with your other conditions.

This is one of the most commonly missed calculations in VA claims — and one reason why veterans with bilateral conditions should verify their rating carefully.

The rounding rule

The VA rounds your final combined rating to the nearest 10%, with one important rule: round at the very end, never during intermediate steps. Combined values ending in 5 or higher round up. This means a veteran with a combined value of 95% rounds to 100% — the full schedular rate — without being rated at 100% for any single condition.

2026 monthly compensation rates

Compensation rates increased by 2.8% effective December 1, 2025 (the 2026 COLA). Key rates for a veteran with no dependents:

• 10%: $175.51/month
• 30%: $524.31/month
• 50%: $1,075.16/month
• 70%: $1,716.28/month
• 80%: $2,102.15/month
• 100%: $3,938.58/month

Veterans rated 30% or higher receive additional amounts for qualifying dependents (spouse, children, dependent parents). The jump from 80% to 100% — over $1,800 per month — is why many veterans pursue rating increases even when the combined math suggests it's close.

What if your rating seems wrong?

Rating errors are more common than most veterans realize. The VA can miscalculate the bilateral factor, apply conditions in the wrong order, or miss secondary conditions altogether. If your math doesn't match what the VA is paying you, it's worth having your rating reviewed by a VA-accredited VSO representative or claims attorney — both can review your file at no upfront cost.

You can also check whether your conditions have worsened since your original rating, which would support a claim for an increased rating.

Does your current rating reflect everything you're entitled to?

Beyond the math, many veterans are eligible for benefits they haven't filed for — secondary conditions, Individual Unemployability (TDIU), or benefits for dependents. Use VetGap's free questionnaire to see what you may be leaving on the table.