CalculatorsUnit convertersVitamin D converter

Vitamin D converter

Convert a vitamin D result between ng/mL and nmol/L, with the whole chart below.

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Vitamin D in nmol/LExample

75nmol/L

In ng/mL: 30.0 ng/mL
In nmol/L: 75 nmol/L

See the working

nmol/L = ng/mL × 2.49630.0 × 2.496 = 74.9 nmol/L

Under 20 ng/mL (50 nmol/L) is the cutoff most guidelines call deficient; under 12 ng/mL (30 nmol/L) is clearly low.

Read my vitamin D with my calcium and PTH.

Two units, one test

US labs print 25-hydroxy vitamin D in ng/mL; the UK, Europe and Australia mostly use nmol/L. Multiply ng/mL by 2.496 (about 2.5) to get nmol/L, and divide to go back.

Where the cutoffs sit

The US National Academies call under 12 ng/mL (30 nmol/L) deficient and 20 ng/mL (50 nmol/L) adequate for most people. Some groups use 30 ng/mL (75 nmol/L) as their target, which is why two labs can flag the same number differently. Above 50 ng/mL (125 nmol/L) is more than most people need.

Vitamin D chart: ng/mL to nmol/L

25-hydroxy vitamin D from 4 to 150 ng/mL (multiply by 2.496).

ng/mL	nmol/L
4	10
5	12
6	15
7	17
8	20
9	22
10	25
11	27
12	30
13	32
14	35
15	37
16	40
17	42
18	45
19	47
20	50
21	52
22	55
23	57
24	60
25	62
26	65
27	67
28	70
29	72
30	75
31	77
32	80
33	82
34	85
35	87
36	90
37	92
38	95
39	97
40	100
41	102
42	105
43	107
44	110
45	112
46	115
47	117
48	120
49	122
50	125
51	127
52	130
53	132
54	135
55	137
56	140
57	142
58	145
59	147
60	150
61	152
62	155
63	157
64	160
65	162
66	165
67	167
68	170
69	172
70	175
71	177
72	180
73	182
74	185
75	187
76	190
77	192
78	195
79	197
80	200
81	202
82	205
83	207
84	210
85	212
86	215
87	217
88	220
89	222
90	225
91	227
92	230
93	232
94	235
95	237
96	240
97	242
98	245
99	247
100	250
101	252
102	255
103	257
104	260
105	262
106	265
107	267
108	270
109	272
110	275
111	277
112	280
113	282
114	285
115	287
116	290
117	292
118	295
119	297
120	300
121	302
122	305
123	307
124	310
125	312
126	314
127	317
128	319
129	322
130	324
131	327
132	329
133	332
134	334
135	337
136	339
137	342
138	344
139	347
140	349
141	352
142	354
143	357
144	359
145	362
146	364
147	367
148	369
149	372
150	374

Questions

How do I convert ng/mL to nmol/L?

Multiply by 2.496. 30 ng/mL is about 75 nmol/L.

How do I convert nmol/L to ng/mL?

Divide by 2.496. 50 nmol/L is about 20 ng/mL.

Is 20 ng/mL low?

20 ng/mL (50 nmol/L) is the level the National Academies call adequate for most people; under 12 ng/mL (30 nmol/L) is deficient.

Sources

NIH Office of Dietary Supplements. Vitamin D fact sheet for health professionals.

Written by LifeFrom from the sources above, and not yet reviewed by a clinician. An estimate for your own understanding: it doesn't diagnose or treat anything, and it doesn't replace your doctor.

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ng/mL	nmol/L
4	10
5	12
6	15
7	17
8	20
9	22
10	25
11	27
12	30
13	32
14	35
15	37
16	40
17	42
18	45
19	47
20	50
21	52
22	55
23	57
24	60
25	62
26	65
27	67
28	70
29	72
30	75
31	77
32	80
33	82
34	85
35	87
36	90
37	92
38	95
39	97
40	100
41	102
42	105
43	107
44	110
45	112
46	115
47	117
48	120
49	122
50	125
51	127
52	130
53	132
54	135
55	137
56	140
57	142
58	145
59	147
60	150
61	152
62	155
63	157
64	160
65	162
66	165
67	167
68	170
69	172
70	175
71	177
72	180
73	182
74	185
75	187
76	190
77	192
78	195
79	197
80	200
81	202
82	205
83	207
84	210
85	212
86	215
87	217
88	220
89	222
90	225
91	227
92	230
93	232
94	235
95	237
96	240
97	242
98	245
99	247
100	250
101	252
102	255
103	257
104	260
105	262
106	265
107	267
108	270
109	272
110	275
111	277
112	280
113	282
114	285
115	287
116	290
117	292
118	295
119	297
120	300
121	302
122	305
123	307
124	310
125	312
126	314
127	317
128	319
129	322
130	324
131	327
132	329
133	332
134	334
135	337
136	339
137	342
138	344
139	347
140	349
141	352
142	354
143	357
144	359
145	362
146	364
147	367
148	369
149	372
150	374

ng/mL	nmol/L
4	10
5	12
6	15
7	17
8	20
9	22
10	25
11	27
12	30
13	32
14	35
15	37
16	40
17	42
18	45
19	47
20	50
21	52
22	55
23	57
24	60
25	62
26	65
27	67
28	70
29	72
30	75
31	77
32	80
33	82
34	85
35	87
36	90
37	92
38	95
39	97
40	100
41	102
42	105
43	107
44	110
45	112
46	115
47	117
48	120
49	122
50	125
51	127
52	130
53	132
54	135
55	137
56	140
57	142
58	145
59	147
60	150
61	152
62	155
63	157
64	160
65	162
66	165
67	167
68	170
69	172
70	175
71	177
72	180
73	182
74	185
75	187
76	190
77	192
78	195
79	197
80	200
81	202
82	205
83	207
84	210
85	212
86	215
87	217
88	220
89	222
90	225
91	227
92	230
93	232
94	235
95	237
96	240
97	242
98	245
99	247
100	250
101	252
102	255
103	257
104	260
105	262
106	265
107	267
108	270
109	272
110	275
111	277
112	280
113	282
114	285
115	287
116	290
117	292
118	295
119	297
120	300
121	302
122	305
123	307
124	310
125	312
126	314
127	317
128	319
129	322
130	324
131	327
132	329
133	332
134	334
135	337
136	339
137	342
138	344
139	347
140	349
141	352
142	354
143	357
144	359
145	362
146	364
147	367
148	369
149	372
150	374

ng/mL	nmol/L
4	10
5	12
6	15
7	17
8	20
9	22
10	25
11	27
12	30
13	32
14	35
15	37
16	40
17	42
18	45
19	47
20	50
21	52
22	55
23	57
24	60
25	62
26	65
27	67
28	70
29	72
30	75
31	77
32	80
33	82
34	85
35	87
36	90
37	92
38	95
39	97
40	100
41	102
42	105
43	107
44	110
45	112
46	115
47	117
48	120
49	122
50	125
51	127
52	130
53	132
54	135
55	137
56	140
57	142
58	145
59	147
60	150
61	152
62	155
63	157
64	160
65	162
66	165
67	167
68	170
69	172
70	175
71	177
72	180
73	182
74	185
75	187
76	190
77	192
78	195
79	197
80	200
81	202
82	205
83	207
84	210
85	212
86	215
87	217
88	220
89	222
90	225
91	227
92	230
93	232
94	235
95	237
96	240
97	242
98	245
99	247
100	250
101	252
102	255
103	257
104	260
105	262
106	265
107	267
108	270
109	272
110	275
111	277
112	280
113	282
114	285
115	287
116	290
117	292
118	295
119	297
120	300
121	302
122	305
123	307
124	310
125	312
126	314
127	317
128	319
129	322
130	324
131	327
132	329
133	332
134	334
135	337
136	339
137	342
138	344
139	347
140	349
141	352
142	354
143	357
144	359
145	362
146	364
147	367
148	369
149	372
150	374