Independent site. Not affiliated with the U.S. Department of Veterans Affairs. Estimates only, no help with claims.

VA math calculator

VA doesn't add your ratings together. Enter each rating and see how VA combines them, step by step, with the bilateral factor.

The formula in 38 CFR 4.25, tested against every value in VA's combined ratings table.
The bilateral factor for both arms or both legs, from 38 CFR 4.26.
Every step shown, so you can check it against your decision letter.

Your ratings

One row for each rated condition Enter each rating on your VA decision. For a condition of an arm or a leg, say which one. If one rating covers both legs or both arms, such as flat feet in both feet, pick Both legs or Both arms. VA may add a bilateral factor when both arms or both legs are rated. Set a row to 0% to leave it out.

Combined value Before rounding
Rounded to the nearest 10 Values ending in 5 round up (38 CFR 4.25)

Your combined VA rating

70%

Seventy percent

Combined value 72 · rounded to 70VA math

How VA math works

VA starts from a whole, healthy person: 100% "efficient". Your highest rating takes its share first. Each next rating takes its share of what is left, not of the whole.

Take 50% and 30%. After the 50%, half of you is left. 30% of that half is 15, so the two combine to 65. VA then rounds to the nearest 10, and 65 rounds up to 70%.

1. Order	Put the ratings in order, highest first.
2. Combine	Combine the first two with VA's combined ratings table. Combine that result with the next rating, and so on.
3. Round once	Only at the end, round to the nearest 10. A value ending in 5 rounds up: 65 becomes 70, 64 becomes 60.
Bilateral factor	When both arms or both legs have ratings of 10% or more, those ratings are combined first and 10% of that value is added. The result counts as one rating.

The bilateral factor, with VA's own example

This is the example in 38 CFR 4.26: ratings of 60%, 20%, 10% and 10%, where the two 10% ratings are for the left and right leg.

Combine the two legs: 10 and 10	19
Add 10% of 19 (1.9), not combined	20.9, rounded to 21
Order of severity	60, 21, 20
60 combined with 21	68
68 combined with 20	74
Rounded to the nearest 10	70%

Which conditions count

"Arms" and "legs" mean the whole limb: an arm includes the forearm and hand, a leg includes the thigh and foot. A right thigh and a left foot count as both legs (38 CFR 4.26(a)).

Both sides must be rated

The factor applies only when each side has a rating of at least 10%. A 0% rating on one side doesn't count (38 CFR 4.26(c)).

Arms and legs together

If both arms and both legs have ratings, all four limbs are combined in one group before the 10% is added (38 CFR 4.26(b)).

When the factor would lower the result

Since April 2023, if leaving some bilateral ratings out of the factor gives a higher combined rating, VA combines them separately instead (38 CFR 4.26(d)). The calculator checks this for you.

VA's manual rounds a bilateral value to the nearest whole number, with .5 and up rounding up (M21-1, Part V, Subpart iv, Chapter 1, Section C). If one rating covers both legs or both arms, such as flat feet in both feet, the factor applies only together with another rating on an arm or leg, as in the manual's examples. The calculator covers arms and legs. The rule also covers paired skeletal muscles, which the calculator doesn't ask about, and VA's manual says the factor may not apply to some skin conditions.

VA's combined ratings table (38 CFR 4.25)

Find the higher value in the left column and the next rating in the top row. Where they meet is the combined value. Our calculator gives the same answer for every cell.

Show the full table

Value	10	20	30	40	50	60	70	80	90
19	27	35	43	51	60	68	76	84	92
20	28	36	44	52	60	68	76	84	92
21	29	37	45	53	61	68	76	84	92
22	30	38	45	53	61	69	77	84	92
23	31	38	46	54	62	69	77	85	92
24	32	39	47	54	62	70	77	85	92
25	33	40	48	55	63	70	78	85	93
26	33	41	48	56	63	70	78	85	93
27	34	42	49	56	64	71	78	85	93
28	35	42	50	57	64	71	78	86	93
29	36	43	50	57	65	72	79	86	93
30	37	44	51	58	65	72	79	86	93
31	38	45	52	59	66	72	79	86	93
32	39	46	52	59	66	73	80	86	93
33	40	46	53	60	67	73	80	87	93
34	41	47	54	60	67	74	80	87	93
35	42	48	55	61	68	74	81	87	94
36	42	49	55	62	68	74	81	87	94
37	43	50	56	62	69	75	81	87	94
38	44	50	57	63	69	75	81	88	94
39	45	51	57	63	70	76	82	88	94
40	46	52	58	64	70	76	82	88	94
41	47	53	59	65	71	76	82	88	94
42	48	54	59	65	71	77	83	88	94
43	49	54	60	66	72	77	83	89	94
44	50	55	61	66	72	78	83	89	94
45	51	56	62	67	73	78	84	89	95
46	51	57	62	68	73	78	84	89	95
47	52	58	63	68	74	79	84	89	95
48	53	58	64	69	74	79	84	90	95
49	54	59	64	69	75	80	85	90	95
50	55	60	65	70	75	80	85	90	95
51	56	61	66	71	76	80	85	90	95
52	57	62	66	71	76	81	86	90	95
53	58	62	67	72	77	81	86	91	95
54	59	63	68	72	77	82	86	91	95
55	60	64	69	73	78	82	87	91	96
56	60	65	69	74	78	82	87	91	96
57	61	66	70	74	79	83	87	91	96
58	62	66	71	75	79	83	87	92	96
59	63	67	71	75	80	84	88	92	96
60	64	68	72	76	80	84	88	92	96
61	65	69	73	77	81	84	88	92	96
62	66	70	73	77	81	85	89	92	96
63	67	70	74	78	82	85	89	93	96
64	68	71	75	78	82	86	89	93	96
65	69	72	76	79	83	86	90	93	97
66	69	73	76	80	83	86	90	93	97
67	70	74	77	80	84	87	90	93	97
68	71	74	78	81	84	87	90	94	97
69	72	75	78	81	85	88	91	94	97
70	73	76	79	82	85	88	91	94	97
71	74	77	80	83	86	88	91	94	97
72	75	78	80	83	86	89	92	94	97
73	76	78	81	84	87	89	92	95	97
74	77	79	82	84	87	90	92	95	97
75	78	80	83	85	88	90	93	95	98
76	78	81	83	86	88	90	93	95	98
77	79	82	84	86	89	91	93	95	98
78	80	82	85	87	89	91	93	96	98
79	81	83	85	87	90	92	94	96	98
80	82	84	86	88	90	92	94	96	98
81	83	85	87	89	91	92	94	96	98
82	84	86	87	89	91	93	95	96	98
83	85	86	88	90	92	93	95	97	98
84	86	87	89	90	92	94	95	97	98
85	87	88	90	91	93	94	96	97	99
86	87	89	90	92	93	94	96	97	99
87	88	90	91	92	94	95	96	97	99
88	89	90	92	93	94	95	96	98	99
89	90	91	92	93	95	96	97	98	99
90	91	92	93	94	95	96	97	98	99
91	92	93	94	95	96	96	97	98	99
92	93	94	94	95	96	97	98	98	99
93	94	94	95	96	97	97	98	99	99
94	95	95	96	96	97	98	98	99	99

Download the table as a CSV file

To cite this page: Vet Kept, "VA math calculator: combined rating with bilateral factor," https://vetkept.com/va-math-calculator/, updated November 7, 2026. Table from 38 CFR 4.25.

Questions people ask

Why doesn't VA add my ratings together?

VA combines ratings so the total can't go past 100%. Each rating applies to the part of you the earlier ratings left, so 50% and 30% combine to 65, which rounds to 70%, not 80%.

How does VA round the combined rating?

Once, at the very end, to the nearest 10. Values ending in 5 or more round up and values ending in 1 to 4 round down, so 65 becomes 70% and 64 becomes 60%.

What is the bilateral factor?

When both arms or both legs have ratings of 10% or more, VA combines those ratings first and adds 10% of the combined value. That total counts as one rating when VA combines it with your other ratings.

Can two ratings of 50% make 100%?

No. 50% and 50% combine to 75, which rounds to 80%.

Will my result match my VA decision?

It uses the same table and rules. Your decision letter is what counts. If your result differs, check that you entered every rating and marked each arm or leg condition.

Updated November 7, 2026. Sources: 38 CFR 4.25 (combined ratings table); 38 CFR 4.26 (bilateral factor, amended April 2023); M21-1, Part V, Subpart iv, Chapter 1, Section C (applying the bilateral factor and rounding); VA, "About disability ratings". Not affiliated with the U.S. Department of Veterans Affairs.

Value	10	20	30	40	50	60	70	80	90
19	27	35	43	51	60	68	76	84	92
20	28	36	44	52	60	68	76	84	92
21	29	37	45	53	61	68	76	84	92
22	30	38	45	53	61	69	77	84	92
23	31	38	46	54	62	69	77	85	92
24	32	39	47	54	62	70	77	85	92
25	33	40	48	55	63	70	78	85	93
26	33	41	48	56	63	70	78	85	93
27	34	42	49	56	64	71	78	85	93
28	35	42	50	57	64	71	78	86	93
29	36	43	50	57	65	72	79	86	93
30	37	44	51	58	65	72	79	86	93
31	38	45	52	59	66	72	79	86	93
32	39	46	52	59	66	73	80	86	93
33	40	46	53	60	67	73	80	87	93
34	41	47	54	60	67	74	80	87	93
35	42	48	55	61	68	74	81	87	94
36	42	49	55	62	68	74	81	87	94
37	43	50	56	62	69	75	81	87	94
38	44	50	57	63	69	75	81	88	94
39	45	51	57	63	70	76	82	88	94
40	46	52	58	64	70	76	82	88	94
41	47	53	59	65	71	76	82	88	94
42	48	54	59	65	71	77	83	88	94
43	49	54	60	66	72	77	83	89	94
44	50	55	61	66	72	78	83	89	94
45	51	56	62	67	73	78	84	89	95
46	51	57	62	68	73	78	84	89	95
47	52	58	63	68	74	79	84	89	95
48	53	58	64	69	74	79	84	90	95
49	54	59	64	69	75	80	85	90	95
50	55	60	65	70	75	80	85	90	95
51	56	61	66	71	76	80	85	90	95
52	57	62	66	71	76	81	86	90	95
53	58	62	67	72	77	81	86	91	95
54	59	63	68	72	77	82	86	91	95
55	60	64	69	73	78	82	87	91	96
56	60	65	69	74	78	82	87	91	96
57	61	66	70	74	79	83	87	91	96
58	62	66	71	75	79	83	87	92	96
59	63	67	71	75	80	84	88	92	96
60	64	68	72	76	80	84	88	92	96
61	65	69	73	77	81	84	88	92	96
62	66	70	73	77	81	85	89	92	96
63	67	70	74	78	82	85	89	93	96
64	68	71	75	78	82	86	89	93	96
65	69	72	76	79	83	86	90	93	97
66	69	73	76	80	83	86	90	93	97
67	70	74	77	80	84	87	90	93	97
68	71	74	78	81	84	87	90	94	97
69	72	75	78	81	85	88	91	94	97
70	73	76	79	82	85	88	91	94	97
71	74	77	80	83	86	88	91	94	97
72	75	78	80	83	86	89	92	94	97
73	76	78	81	84	87	89	92	95	97
74	77	79	82	84	87	90	92	95	97
75	78	80	83	85	88	90	93	95	98
76	78	81	83	86	88	90	93	95	98
77	79	82	84	86	89	91	93	95	98
78	80	82	85	87	89	91	93	96	98
79	81	83	85	87	90	92	94	96	98
80	82	84	86	88	90	92	94	96	98
81	83	85	87	89	91	92	94	96	98
82	84	86	87	89	91	93	95	96	98
83	85	86	88	90	92	93	95	97	98
84	86	87	89	90	92	94	95	97	98
85	87	88	90	91	93	94	96	97	99
86	87	89	90	92	93	94	96	97	99
87	88	90	91	92	94	95	96	97	99
88	89	90	92	93	94	95	96	98	99
89	90	91	92	93	95	96	97	98	99
90	91	92	93	94	95	96	97	98	99
91	92	93	94	95	96	96	97	98	99
92	93	94	94	95	96	97	98	98	99
93	94	94	95	96	97	97	98	99	99
94	95	95	96	96	97	98	98	99	99

Value	10	20	30	40	50	60	70	80	90
19	27	35	43	51	60	68	76	84	92
20	28	36	44	52	60	68	76	84	92
21	29	37	45	53	61	68	76	84	92
22	30	38	45	53	61	69	77	84	92
23	31	38	46	54	62	69	77	85	92
24	32	39	47	54	62	70	77	85	92
25	33	40	48	55	63	70	78	85	93
26	33	41	48	56	63	70	78	85	93
27	34	42	49	56	64	71	78	85	93
28	35	42	50	57	64	71	78	86	93
29	36	43	50	57	65	72	79	86	93
30	37	44	51	58	65	72	79	86	93
31	38	45	52	59	66	72	79	86	93
32	39	46	52	59	66	73	80	86	93
33	40	46	53	60	67	73	80	87	93
34	41	47	54	60	67	74	80	87	93
35	42	48	55	61	68	74	81	87	94
36	42	49	55	62	68	74	81	87	94
37	43	50	56	62	69	75	81	87	94
38	44	50	57	63	69	75	81	88	94
39	45	51	57	63	70	76	82	88	94
40	46	52	58	64	70	76	82	88	94
41	47	53	59	65	71	76	82	88	94
42	48	54	59	65	71	77	83	88	94
43	49	54	60	66	72	77	83	89	94
44	50	55	61	66	72	78	83	89	94
45	51	56	62	67	73	78	84	89	95
46	51	57	62	68	73	78	84	89	95
47	52	58	63	68	74	79	84	89	95
48	53	58	64	69	74	79	84	90	95
49	54	59	64	69	75	80	85	90	95
50	55	60	65	70	75	80	85	90	95
51	56	61	66	71	76	80	85	90	95
52	57	62	66	71	76	81	86	90	95
53	58	62	67	72	77	81	86	91	95
54	59	63	68	72	77	82	86	91	95
55	60	64	69	73	78	82	87	91	96
56	60	65	69	74	78	82	87	91	96
57	61	66	70	74	79	83	87	91	96
58	62	66	71	75	79	83	87	92	96
59	63	67	71	75	80	84	88	92	96
60	64	68	72	76	80	84	88	92	96
61	65	69	73	77	81	84	88	92	96
62	66	70	73	77	81	85	89	92	96
63	67	70	74	78	82	85	89	93	96
64	68	71	75	78	82	86	89	93	96
65	69	72	76	79	83	86	90	93	97
66	69	73	76	80	83	86	90	93	97
67	70	74	77	80	84	87	90	93	97
68	71	74	78	81	84	87	90	94	97
69	72	75	78	81	85	88	91	94	97
70	73	76	79	82	85	88	91	94	97
71	74	77	80	83	86	88	91	94	97
72	75	78	80	83	86	89	92	94	97
73	76	78	81	84	87	89	92	95	97
74	77	79	82	84	87	90	92	95	97
75	78	80	83	85	88	90	93	95	98
76	78	81	83	86	88	90	93	95	98
77	79	82	84	86	89	91	93	95	98
78	80	82	85	87	89	91	93	96	98
79	81	83	85	87	90	92	94	96	98
80	82	84	86	88	90	92	94	96	98
81	83	85	87	89	91	92	94	96	98
82	84	86	87	89	91	93	95	96	98
83	85	86	88	90	92	93	95	97	98
84	86	87	89	90	92	94	95	97	98
85	87	88	90	91	93	94	96	97	99
86	87	89	90	92	93	94	96	97	99
87	88	90	91	92	94	95	96	97	99
88	89	90	92	93	94	95	96	98	99
89	90	91	92	93	95	96	97	98	99
90	91	92	93	94	95	96	97	98	99
91	92	93	94	95	96	96	97	98	99
92	93	94	94	95	96	97	98	98	99
93	94	94	95	96	97	97	98	99	99
94	95	95	96	96	97	98	98	99	99

Value	10	20	30	40	50	60	70	80	90
19	27	35	43	51	60	68	76	84	92
20	28	36	44	52	60	68	76	84	92
21	29	37	45	53	61	68	76	84	92
22	30	38	45	53	61	69	77	84	92
23	31	38	46	54	62	69	77	85	92
24	32	39	47	54	62	70	77	85	92
25	33	40	48	55	63	70	78	85	93
26	33	41	48	56	63	70	78	85	93
27	34	42	49	56	64	71	78	85	93
28	35	42	50	57	64	71	78	86	93
29	36	43	50	57	65	72	79	86	93
30	37	44	51	58	65	72	79	86	93
31	38	45	52	59	66	72	79	86	93
32	39	46	52	59	66	73	80	86	93
33	40	46	53	60	67	73	80	87	93
34	41	47	54	60	67	74	80	87	93
35	42	48	55	61	68	74	81	87	94
36	42	49	55	62	68	74	81	87	94
37	43	50	56	62	69	75	81	87	94
38	44	50	57	63	69	75	81	88	94
39	45	51	57	63	70	76	82	88	94
40	46	52	58	64	70	76	82	88	94
41	47	53	59	65	71	76	82	88	94
42	48	54	59	65	71	77	83	88	94
43	49	54	60	66	72	77	83	89	94
44	50	55	61	66	72	78	83	89	94
45	51	56	62	67	73	78	84	89	95
46	51	57	62	68	73	78	84	89	95
47	52	58	63	68	74	79	84	89	95
48	53	58	64	69	74	79	84	90	95
49	54	59	64	69	75	80	85	90	95
50	55	60	65	70	75	80	85	90	95
51	56	61	66	71	76	80	85	90	95
52	57	62	66	71	76	81	86	90	95
53	58	62	67	72	77	81	86	91	95
54	59	63	68	72	77	82	86	91	95
55	60	64	69	73	78	82	87	91	96
56	60	65	69	74	78	82	87	91	96
57	61	66	70	74	79	83	87	91	96
58	62	66	71	75	79	83	87	92	96
59	63	67	71	75	80	84	88	92	96
60	64	68	72	76	80	84	88	92	96
61	65	69	73	77	81	84	88	92	96
62	66	70	73	77	81	85	89	92	96
63	67	70	74	78	82	85	89	93	96
64	68	71	75	78	82	86	89	93	96
65	69	72	76	79	83	86	90	93	97
66	69	73	76	80	83	86	90	93	97
67	70	74	77	80	84	87	90	93	97
68	71	74	78	81	84	87	90	94	97
69	72	75	78	81	85	88	91	94	97
70	73	76	79	82	85	88	91	94	97
71	74	77	80	83	86	88	91	94	97
72	75	78	80	83	86	89	92	94	97
73	76	78	81	84	87	89	92	95	97
74	77	79	82	84	87	90	92	95	97
75	78	80	83	85	88	90	93	95	98
76	78	81	83	86	88	90	93	95	98
77	79	82	84	86	89	91	93	95	98
78	80	82	85	87	89	91	93	96	98
79	81	83	85	87	90	92	94	96	98
80	82	84	86	88	90	92	94	96	98
81	83	85	87	89	91	92	94	96	98
82	84	86	87	89	91	93	95	96	98
83	85	86	88	90	92	93	95	97	98
84	86	87	89	90	92	94	95	97	98
85	87	88	90	91	93	94	96	97	99
86	87	89	90	92	93	94	96	97	99
87	88	90	91	92	94	95	96	97	99
88	89	90	92	93	94	95	96	98	99
89	90	91	92	93	95	96	97	98	99
90	91	92	93	94	95	96	97	98	99
91	92	93	94	95	96	96	97	98	99
92	93	94	94	95	96	97	98	98	99
93	94	94	95	96	97	97	98	99	99
94	95	95	96	96	97	98	98	99	99