VA Combined Rating Calculator

Estimate Your Combined VA Disability Rating

This VA disability calculator uses the same "VA math" method the VA applies when combining multiple service-connected conditions. If you searched for a VA combined rating calculator, VA disability calculator combined, or VA combined disability calculator, this tool is built for that exact estimate. Enter each individual rating below to see an estimated combined rating.

Once you have an estimate, compare it to the 2026 VA disability rates and review our claims and appeals guidance if your current decision may be underrating your conditions.

This tool is for educational purposes only and does not file a claim or guarantee any specific VA decision. The Department of Veterans Affairs makes the final determination on all ratings and payments.

How VA Combined Ratings And VA Math Work

VA math does not simply add ratings together. Instead, the VA looks at how much of your body remains "efficient" after each service-connected condition is applied.

1. Start at 100% efficient and apply the highest rating first.
2. For each additional rating, the VA applies it only to the remaining efficiency.
3. The result is rounded to the nearest 10% to get your combined rating.

Example: If you have ratings of 50% and 30%, they are not added to 80%. Instead, 50% leaves you 50% efficient. Then 30% is applied to that remaining 50% (which is 15%). The VA combines 50% and 15% to get 65%, then rounds to 70%.

That rounding step matters because even a small change in the combined percentage can affect what you are paid under the current VA compensation tables.

If you want a fuller breakdown of how the percentages combine, when rounding changes the final rating, and what mistakes to look for in a decision letter, read our guide to how VA combined ratings work.

VA Math Explained Step by Step

The single most important thing to understand about combined VA disability ratings is that ratings are never added together. A veteran with a 50% rating and a 30% rating does not have an 80% combined rating. The VA uses a method commonly called VA math, and it always produces a number lower than the simple sum.

The reasoning behind it is that the VA treats you as a whole person. You start out 100% efficient, and each service-connected condition takes a bite out of whatever efficiency is left, not out of the original whole. Here is the full walkthrough for a 50% rating and a 30% rating:

1. Start at 100% efficiency. Before any rating is applied, the VA considers you 100% efficient.
2. Apply the highest rating first. The 50% rating is applied to the full 100%, which uses up 50 percentage points and leaves you 50% efficient.
3. Apply the next rating to what remains, not to the whole. The 30% rating is applied to the remaining 50% efficiency. 30% of 50 is 15, so the second condition accounts for 15 percentage points, not 30.
4. Add the results together. 50 plus 15 gives a raw combined value of 65%.
5. Round to the nearest 10%. A raw value of 65 rounds up to a final combined rating of 70%.

So two ratings that look like they should total 80% produce a 70% combined rating instead. If you had added them, you would have expected a payment that the VA is never going to make. The same process repeats for a third rating, a fourth, and so on: each new condition is applied only to the efficiency that survived every rating before it, which is why adding more small ratings moves your combined total less and less.

Worked Examples: Common Rating Combinations

The table below runs several common rating combinations through the same process. The middle column is the raw combined value before rounding, and the last column is the rating the VA actually assigns.

Notice the last row. Three separate 10% ratings, which would add up to 30% under ordinary arithmetic, happen to reach 30% here only because 27 rounds up. A fourth 10% rating would push the raw value to roughly 34, which still rounds to 30%. That is the clearest illustration of why stacking low ratings rarely produces the increase veterans expect.

The Bilateral Factor

There is one adjustment that works in your favour, and it is routinely missed. When a veteran has service-connected disabilities affecting both arms, both legs, or paired skeletal muscles, the VA applies what is called the bilateral factor. It combines those paired conditions first, then adds an extra 10% of that combined value before combining the result with everything else.

Here is a worked example. Suppose a veteran has a 30% rating for the right knee and a 20% rating for the left knee:

1. Combine the two bilateral conditions normally. 30% leaves 70% efficiency; 20% of 70 is 14; 30 plus 14 gives a combined value of 44.
2. Apply the bilateral factor. 10% of 44 is 4.4, so 44 becomes 48.4.
3. Round to the nearest 10%. 48.4 rounds to a 50% combined rating.

Without the bilateral factor, that same veteran would sit at a raw value of 44, which rounds down to 40%. The bilateral factor is the difference between a 40% rating and a 50% rating, which is a meaningful monthly amount under the 2026 VA disability rates. If you have paired conditions and your decision letter shows no bilateral adjustment, that is worth a closer look.

Why Your Combined Rating Is Lower Than You Expected

Almost every veteran who is surprised by a combined rating has run into one of three things.

1. VA math rather than addition. This is by far the most common cause. As the examples above show, the gap between the sum of your ratings and your actual combined rating widens with every condition you add. A veteran with 50%, 30%, and 20% ratings adds them to 100% and is then told the combined rating is 70%.

2. The rounding rule. Because the final value is rounded to the nearest 10%, a raw value of 64 becomes 60% while a raw value of 65 becomes 70%. A single percentage point in the raw calculation can be worth hundreds of dollars a month. This also means that a newly granted small rating can change nothing at all if it does not push you past the next rounding threshold.

3. The pyramiding rule. Under VA regulations the same symptom cannot be rated twice under two different diagnostic codes. If you have two diagnoses that produce the same functional loss, for example two conditions that both cause the same limitation of motion in one knee, the VA will generally rate the one that produces the higher evaluation and not the other. Veterans often expect both to count and are surprised when only one appears in the combined calculation.

How to Use Your Combined Rating Estimate

The number this calculator produces is an estimate, not a decision. It applies the same arithmetic the VA applies, but it works only from the individual ratings you type in. It does not know whether a condition is service-connected, whether a diagnostic code was chosen correctly, whether a bilateral factor applies to your specific pairing, or whether the VA has evidence it never considered. Only the VA can decide those questions.

What the estimate is genuinely useful for is a cross-check. Pull out your most recent decision letter, list every service-connected condition and its individual rating, and run those numbers here. If the estimate matches the combined rating on the letter, the arithmetic was done correctly and any disagreement you have is about the individual ratings themselves, not the combination.

If the estimate is higher than the rating on your letter, the gap is worth investigating. It may mean a condition was left out of the combined calculation, that a bilateral factor was not applied, or that a rounding step went wrong. A gap of a full 10 percentage points that you cannot explain is the kind of issue a higher-level review is designed to address, since that process asks a senior reviewer to look for a clear error in how the decision was reached without requiring new evidence.

Not Sure If Your Rating Is Correct?

If this calculator suggests a higher combined rating than what you're currently receiving, or if your conditions have worsened over time, it may be time to seek an increase or file an appeal.

• Review your most recent VA decision letter.
• Make a list of all service-connected conditions and current ratings.
• Gather updated medical records and statements about your limitations.

Ivery Federal Law can help you evaluate the strength of your case and plan the best way to move forward.

After you estimate your combined rating here, compare it against the current 2026 VA disability rates and review our VA disability claims and appeals page if you believe you may qualify for an increase, a better effective date, or an appeal.

VA Combined Rating Calculator FAQ