grams to mg converter

1 gram equals 1,000 milligrams. Conversions use mg = g × 1000

g → 1,000 mg

mg = g × 1000

Converter

Worked examples

1 g = 1,000 mg
2 g = 2,000 mg
5 g = 5,000 mg
10 g = 10,000 mg
100 g = 100,000 mg

grams to milligrams conversion table

g	mg	Arithmetic
0.1 g	100 mg	× 1000
0.25 g	250 mg	× 1000
0.5 g	500 mg	× 1000
1 g	1,000 mg	× 1000
2 g	2,000 mg	× 1000
5 g	5,000 mg	× 1000
10 g	10,000 mg	× 1000
3 g	3,000 mg	× 1000
4 g	4,000 mg	× 1000
6 g	6,000 mg	× 1000
8 g	8,000 mg	× 1000
12 g	12,000 mg	× 1000
15 g	15,000 mg	× 1000
20 g	20,000 mg	× 1000
25 g	25,000 mg	× 1000
30 g	30,000 mg	× 1000
40 g	40,000 mg	× 1000
50 g	50,000 mg	× 1000
60 g	60,000 mg	× 1000
70 g	70,000 mg	× 1000
80 g	80,000 mg	× 1000
90 g	90,000 mg	× 1000
100 g	100,000 mg	× 1000

How to convert g to mg

Take your value in grams.
Multiply by 1000
That is your answer in milligrams — no rounding needed until you choose a display precision.

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Questions

How many milligrams in 1 gram?

Exactly 1,000 mg. The factor follows from the definitions of both units, not from a measurement, so it is exact.

How do I convert g to mg?

Multiply the grams figure by 1000 — or use the converter above, which updates as you type.

Is g to mg the same as mg to g?

No — they are inverses. One g is 1,000 mg, while one mg is 0.001 g.

What is 0.1 g in mg?

0.1 g = 100 mg (see the value page for the full arithmetic).