VA Percentage Calculator: How It Works

The VA percentage calculator determines your combined disability rating from the individual ratings for each service-connected condition, using the VA’s combined ratings table. Enter each condition’s rating (0–100%), and the calculator returns your single overall disability percentage, which determines your monthly compensation. The result is rounded to the nearest 10% and is what the VA uses to set your benefit amount.

Formula

The VA does not add ratings together. Instead, it applies each rating to the remaining “whole” percentage of you. The formula is:

Combined rating = 100 × (1 − ∏(1 − r_i/100))

Where r_i is each individual condition rating in percent. For example, with ratings of 50%, 30%, and 10%, the calculation is:

100 × (1 − (1 − 0.50) × (1 − 0.30) × (1 − 0.10)) = 100 × (1 − 0.50 × 0.70 × 0.90) = 100 × (1 − 0.315) = 68.5%

The VA rounds to the nearest 10%, so 68.5% becomes 70%. This is the number that determines your monthly compensation.

Worked Example

Using the default values from the calculator above:

• Condition 1: 50%
• Condition 2: 30%
• Condition 3: 10%

Step 1: Convert each rating to a decimal and subtract from 1: (1 − 0.50) = 0.50, (1 − 0.30) = 0.70, (1 − 0.10) = 0.90.

Step 2: Multiply those together: 0.50 × 0.70 × 0.90 = 0.315.

Step 3: Subtract from 1: 1 − 0.315 = 0.685.

Step 4: Multiply by 100: 68.5%.

Step 5: Round to nearest 10%: 70%.

The calculator shows 70%, matching the VA’s own table.

How the VA Combined Ratings Table Works

The VA uses a specific table (found in 38 CFR §4.25) that lists every possible pair of ratings from 10% to 100%. The table is built on the same formula above but is presented as a lookup grid. The key rule is that the order of conditions does not matter—you get the same combined rating regardless of which condition you start with. The table also includes a special rule for bilateral conditions (e.g., both arms or both legs): the VA combines the bilateral ratings first, adds a 10% “bilateral factor” to that subtotal, and then combines that with the other ratings. This calculator does not apply the bilateral factor—it assumes all conditions are independent.

How to Use the Calculator Correctly

To get an accurate estimate, you need the official rating for each condition from your VA decision letter. Do not guess or use the severity of symptoms—use the exact percentage the VA assigned. Enter each condition as a separate line. If you have more than three conditions, you can combine them in stages: first combine the first two, then combine that result with the third, and so on. The calculator above accepts three inputs, but you can repeat the process for additional conditions. Remember that the result is an estimate; the VA’s official table may differ slightly due to rounding steps in intermediate combinations.

Common Mistakes and Misconceptions

• Adding ratings directly: 50% + 30% + 10% = 90% is wrong. The correct combined rating is 70%.
• Rounding too early: The VA rounds only the final combined rating, not intermediate steps. If you round each condition to the nearest 10% before combining, you may get a different result.
• Ignoring the bilateral factor: If you have conditions on both arms or both legs, the VA adds a 10% factor to the combined value of those bilateral conditions. This calculator does not account for that, so your actual rating may be slightly higher.
• Assuming 100% means total disability: A 100% rating does not mean you are completely incapacitated; it is a legal threshold for maximum compensation. Many veterans with 100% ratings work and live independently.

How to Read Your Result

Your combined rating determines your monthly compensation. As of 2024, a 70% rating for a veteran with no dependents pays about $1,663 per month, but that amount changes annually and with dependents. The rating also affects access to VA healthcare priority groups and other benefits. A rating of 0% means no compensation, but you may still be eligible for healthcare. Ratings of 10% to 90% are paid in increments; 100% is the maximum. The combined rating is not a measure of your overall health—it is a legal classification for benefits.

Limitations of the Formula

The formula assumes all conditions are independent and that the VA’s table is a simple multiplicative combination. In reality, the VA’s table has specific rounding rules and the bilateral factor, which can change the result by a few percentage points. The formula also does not account for special monthly compensation (SMC) for severe conditions like loss of use of a limb or blindness. SMC is paid in addition to the combined rating and is not calculated here. For a precise rating, you must use the official VA table and consider all special rules—this calculator is a close approximation for most cases.

Frequently Asked Questions

Why doesn’t the VA just add my ratings together?

The VA uses a combined ratings table because disabilities affect a person’s overall functioning in a non-linear way. If you have two 50% disabilities, the first reduces your efficiency by half, leaving 50%. The second reduces that remaining 50% by half, leaving 25% efficiency, so your combined disability is 75%. Adding would give 100%, which would overstate the impact.

Can I use this calculator for my official claim?

No. This calculator is for estimation only. The VA will calculate your official rating using its own table and rules. You should use this to get a rough idea of where you stand, but the final decision comes from the VA.

What if I have more than three conditions?

Combine them in stages. Use the calculator to combine the first two, then take that result as the first input and combine it with the third, and so on. The order does not matter, but you must use the unrounded intermediate result for accuracy.

Does the bilateral factor apply to me?

It applies if you have disabilities on both arms, both legs, or paired skeletal muscles. For example, if you have 20% in each knee, the VA combines those two as 36%, then adds 10% of that (3.6%) to get 39.6%, which rounds to 40%. This calculator does not apply that factor, so your actual rating may be a bit higher.

How often can I request a re-evaluation?

You can file a claim for increased rating at any time if your condition worsens. The VA may also schedule periodic re-examinations for certain conditions. There is no limit on how many times you can apply, but each claim requires new evidence.

What is the difference between a combined rating and a total rating?

A combined rating is the result of the table (e.g., 70%). A total rating is 100%, which is the maximum. You can reach 100% through a single condition or through a combination. Some veterans with a combined rating below 100% may receive SMC, which can pay more than the standard 100% rate.

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in r1 | Condition 1 rating | % | 50 | 0
in r2 | Condition 2 rating | % | 30 | 0
in r3 | Condition 3 rating | % | 10 | 0
out combined | Combined rating | % | round(100 - (100 - r1) * (100 - r2) * (100 - r3) / 10000, 0) | 0