Grams to Milligrams Converter

How to convert grams to milligrams

milligrams = grams × 1,000

1 gram is one thousandth of a kilogram. 1 milligram is one thousandth of a gram.

The factor is exact in both directions: 1 g = 1,000 mg and 1 mg = 0.001 g. Nothing is rounded until you choose how many decimals to show.

Worked example: 2.5 g

1. Start with the value in grams: 2.5 g.
2. Multiply by 1,000, because 1 gram = 1,000 milligrams: 2.5 × 1,000 = 2,500 mg.

Grams to milligrams chart

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Grams from 1 to 100 converted to milligrams with the exact factor, shown to five significant digits.

Grams to milligrams, part 1 of 4

g	mg
1	1,000
2	2,000
3	3,000
4	4,000
5	5,000
6	6,000
7	7,000
8	8,000
9	9,000
10	10,000
11	11,000
12	12,000
13	13,000
14	14,000
15	15,000
16	16,000
17	17,000
18	18,000
19	19,000
20	20,000
21	21,000
22	22,000
23	23,000
24	24,000
25	25,000

Grams to milligrams, part 2 of 4

g	mg
26	26,000
27	27,000
28	28,000
29	29,000
30	30,000
31	31,000
32	32,000
33	33,000
34	34,000
35	35,000
36	36,000
37	37,000
38	38,000
39	39,000
40	40,000
41	41,000
42	42,000
43	43,000
44	44,000
45	45,000
46	46,000
47	47,000
48	48,000
49	49,000
50	50,000

Grams to milligrams, part 3 of 4

g	mg
51	51,000
52	52,000
53	53,000
54	54,000
55	55,000
56	56,000
57	57,000
58	58,000
59	59,000
60	60,000
61	61,000
62	62,000
63	63,000
64	64,000
65	65,000
66	66,000
67	67,000
68	68,000
69	69,000
70	70,000
71	71,000
72	72,000
73	73,000
74	74,000
75	75,000

Grams to milligrams, part 4 of 4

g	mg
76	76,000
77	77,000
78	78,000
79	79,000
80	80,000
81	81,000
82	82,000
83	83,000
84	84,000
85	85,000
86	86,000
87	87,000
88	88,000
89	89,000
90	90,000
91	91,000
92	92,000
93	93,000
94	94,000
95	95,000
96	96,000
97	97,000
98	98,000
99	99,000
100	100,000

milligrams = grams × 1,000. Factors: BIPM SI Brochure. unitcheck.net/weight/grams-to-milligrams/

Going the other way? Use the Milligrams to Grams converter.