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VA Combined Rating Calculator

Enter each service-connected disability below. Select the body location so the calculator can automatically detect bilateral pairs (both arms or both legs) and apply the 10% bilateral factor required by 38 CFR §4.26. Results update instantly and show every step of the math.

Combined rating: 10%

  1. Single rating of 10% — nothing to combine.
  2. 10% converts to a final combined rating of 10%.

Dependent additions begin at 30%.

Monthly compensation (2026): $180.42 full 10% rate table

How VA combined ratings math works

Many veterans expect their ratings to add together like ordinary numbers. 50% plus 30% should equal 80%, right? The VA uses a different method called the efficiency basis, also known as the "whole person" approach. Each disability reduces your remaining ability to function, not a fixed percentage of 100%.

The formula: start with your highest rating. That disability leaves you with a certain percentage of "whole person" remaining. Your next disability is then applied to that remaining percentage, not to the full 100. Mathematically: combined = higher + (lower × (100 − higher) / 100), with the result rounded to the nearest whole number.

As a concrete example, 50% combined with 30% gives: 50 + (30 × 50 / 100) = 50 + 15 = 65. That 65 is then converted to a final rating of 70% (the nearest ten, with values ending in 5 rounding up). With three or more disabilities, the VA sorts them from highest to lowest, combines the top two first, then combines that result with the next, and so on. The final whole-number result is then converted to the nearest 10%.

The conversion step is worth understanding: anything from 45 to 54 rounds to 50; 55 to 64 rounds to 60. Values ending in exactly 5 always round up, so 45 becomes 50, never 40. This is specified in 38 CFR §4.25.

When the bilateral factor applies

The bilateral factor is an additional 10% benefit for veterans who have compensable (10% or higher) service-connected disabilities affecting both sides of a matched pair: both arms, both legs, or paired skeletal muscles. One arm disability plus one leg disability does not qualify. The pair must be symmetrical under 38 CFR §4.26.

When the bilateral factor applies, all qualifying bilateral ratings are combined first using the standard efficiency formula. Then 10% of that combined value is added to it, and the result is treated as a single disability for the remainder of the calculation. If you have multiple qualifying pairs (say, both arms and both legs) all four ratings go into one bilateral group, which receives one 10% factor, not two.

The rationale behind the factor: bilateral disabilities are harder to compensate for than unilateral ones. Losing function in both hands is more than twice as limiting as losing it in one. The regulation reflects that reality.

Worked example: 30% right knee + 20% left knee

A veteran has a 30% rating for the right knee and a 20% rating for the left knee. Both are leg disabilities, both are compensable, so the bilateral factor applies.

Step 1: Combine the bilateral pair: 30 + (20 × 70 / 100) = 30 + 14 = 44%.

Step 2: Apply the bilateral factor: 10% of 44 = 4.4. Add that to 44: 44 + 4.4 = 48.4, rounded to 48%.

Step 3: Convert to final rating: 48 is closest to 50 (since 45 to 54 maps to 50). Final rating: 50%.

Without the bilateral factor, the combined value stays at 44%, which converts to 40%. The bilateral factor is worth a full rating step in this case. For veterans near a rating threshold, that difference means significantly higher monthly compensation.

Disclaimer

This tool is informational only. It is not a VA decision, and your official rating may differ based on evidence, exam findings, and VA adjudication. Not affiliated with the U.S. Department of Veterans Affairs. Full disclaimer →

Frequently asked questions

Why doesn't 50 + 30 equal 80?

The VA uses the "whole person" efficiency method, not simple addition. After the 50% disability, you have 50% whole-person capacity remaining. The 30% disability is applied to that remainder: 30% of 50 = 15. So 50 + 15 = 65, which rounds to 70%. Simple addition would overstate the combined impact and would reach 100% before all disabilities are even accounted for. The governing regulation is 38 CFR §4.25.

What is the bilateral factor?

The bilateral factor is an extra 10% adjustment added when a veteran has compensable service-connected disabilities on both sides of a matched pair: both arms, both legs, or paired skeletal muscles. The qualifying bilateral ratings are combined first, and 10% of that combined value is added before the result enters the overall combined rating calculation. The bilateral factor is defined in 38 CFR §4.26. For a deep dive, see our guide on the bilateral factor.

Does the bilateral factor apply to one arm and one leg?

No. Per 38 CFR §4.26, the bilateral factor requires a matched pair: both arms, both legs, or both sides of a paired skeletal muscle. One arm disability plus one leg disability does not qualify, regardless of the ratings involved. The pairing must be symmetrical: left and right of the same limb type.

Is this calculator official?

No. This calculator is an independent informational tool, not an official VA system. It is not affiliated with the U.S. Department of Veterans Affairs. The math follows 38 CFR §4.25 and §4.26 as closely as possible, but your official VA rating is determined by VA adjudicators reviewing your full evidence of record. Always verify important decisions with a VSO or accredited claims agent.

Learn more

For a detailed explanation of how the bilateral factor works, the history behind the regulation, and common mistakes to avoid, read our deep dive on the bilateral factor. To look up rating criteria for specific conditions, visit the conditions library where each entry cites the diagnostic code and rating schedule language directly. To find the monthly dollar amount your combined rating translates to, see the full 2026 pay tables.

If the rating in your decision letter is lower than what this calculator shows, the letter's math may be wrong. See what to do after a VA decision you disagree with to check the combined-rating math and choose the right review lane.

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