Grams to mg Converter.

1 g = 1,000 mg, so 2.5 g = 2,500 mg. Type any value below to convert grams to mg instantly.

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Reference Table

mg	g	kg	t	oz	lb	st	ton
2.5	0.0025	0.0000025	2.500000e-9	0.0000881849	0.0000055116	3.936826e-7	2.755778e-9
25	0.025	0.000025	2.500000e-8	0.000881849	0.0000551156	0.0000039368	2.755778e-8
250	0.25	0.00025	2.500000e-7	0.0088184905	0.0005511557	0.0000393683	2.755778e-7
2500	2.5	0.0025	0.0000025	0.0881849049	0.0055115566	0.0003936826	0.0000027558
25000	25	0.025	0.000025	0.8818490487	0.0551155655	0.0039368261	0.0000275578
250000	250	0.25	0.00025	8.81849	0.5511556555	0.0393682611	0.0002755778
2500000	2500	2.5	0.0025	88.184905	5.511557	0.393682611	0.0027557783

How to convert grams to mg

Formula.milligrams = grams × 1000.

Relationship.1 g = 1,000 mg.

Worked example. 2.5 g = 2,500 mg.

grams to mg conversion table

g	mg
0.001	1
0.005	5
0.01	10
0.025	25
0.05	50
0.1	100
0.125	125
0.2	200
0.25	250
0.3	300
0.5	500
0.75	750
1	1000
1.5	1500
2	2000
2.3	2300
2.5	2500
3	3000
5	5000
6	6000
10	10000
15	15000
25	25000
50	50000
100	100000

Frequently Asked Questions

How do I convert grams to mg?

Multiply by 1,000. For example, 2.5 g × 1,000 = 2,500 mg.

How many mg is 1 gram?

Exactly 1,000 mg. The metric prefixes are powers of ten, so the conversion is a shift of three decimal places.

How much sodium is in a teaspoon of salt?

A level teaspoon of table salt weighs about 6 g, and salt is roughly 40% sodium, so it holds about 2,300 mg of sodium: the whole of the daily limit in US guidelines.

Why convert grams to milligrams?

Doses, supplements and nutrition labels use milligrams for small amounts, while recipes and scales use grams. Converting to one unit is the only safe way to compare them.