Milligrams to grams

1 milligram = 0.001 grams

Type a value in milligrams (mg) to get grams (g) straight away. A milligram is smaller than a gram, so the number goes down. Both units belong to weight, measured here against the kilogram.

FromTo0.001

1 mg = 0.001 g

Formula

g = mg × 0.001

One milligram is 0.001 grams, so multiply by that factor. You can also divide by 1,000, the number of milligrams in one gram. Here mg is the value in milligrams and g is the result in grams.

Worked example: 500 milligrams × 0.001 = 0.5 grams.

Milligrams to grams table

milligrams (mg)	grams (g)
1 mg	0.001 g
2 mg	0.002 g
3 mg	0.003 g
4 mg	0.004 g
5 mg	0.005 g
6 mg	0.006 g
7 mg	0.007 g
8 mg	0.008 g
9 mg	0.009 g
10 mg	0.01 g
15 mg	0.015 g
20 mg	0.02 g
25 mg	0.025 g
30 mg	0.03 g
40 mg	0.04 g
50 mg	0.05 g
60 mg	0.06 g
75 mg	0.075 g
100 mg	0.1 g

Everyday milligrams in grams

What it is	mg	g
a low-dose aspirin	81 mg	0.081 g
a common ibuprofen tablet	200 mg	0.2 g
a paracetamol tablet	500 mg	0.5 g
a large paracetamol tablet	650 mg	0.65 g
a 1 g dose	1,000 mg	1 g

Quick estimate in your head

Divide by 10^3: move the decimal point 3 places left.

About the units

Milligram (mg). One thousandth of a gram. Used for medicine doses and nutrition labels.

Gram (g). One thousandth of a kilogram. Used for food, post and jewellery.

Going the other way, 1 gram is 1,000 milligrams.

Questions

How many grams are in 1 milligram?

1 milligram is 0.001 grams, and 1 gram is 1,000 milligrams.

How do I convert milligrams to grams?

Use g = mg × 0.001. For example, 500 milligrams × 0.001 = 0.5 grams.

Is the milligram to gram factor exact?

The factor comes from the unit definitions. Results here are rounded to 6 significant digits for display.

How much is a 1 g dose in grams?

1,000 mg is 1 g.

Source for the conversion factor: NIST SP 811, Appendix B (conversion factors).

Related conversions

All weight converters