The complications emerge when more than one rating must be combined to calculate your combined rating. Share this page via Email. If you believe that your service-connected disability(s) warrants a higher rating or if your service-connected disability(s) keeps you from working, contact our office for a free consultation. Disclaimer: This information is not legal advice. To get a more accurate assessment of your potential total disability rating, contact Veterans Guardian for a free claim evaluation. About Our VA Disability Calculator. Heading 1 . On the Basic rates table, find the amount for your disability rating and dependent status. Our calculator saves you the math and saves you time calculating percentages of percentages.