How do I convert milligrams back to grams?

Use the reverse converter: 1 milligram equals 0.001 g.

Is this converter accurate?

Yes. It uses the exact SI/NIST definitions of each unit and shows up to 6 significant digits.

To convert grams to milligrams, multiply the value by 1000.

mg = g × 1000

40 g × 1000 = 40000 mg

Gram (g): Common for food, recipes and small items in metric countries. One thousandth of a kilogram.
Milligram (mg): Used for medicine doses and nutrition labels worldwide. One thousandth of a gram.

How do I convert grams to milligrams?: To convert grams to milligrams, multiply the value by 1000.
How many milligrams are in 1 gram?: 1 gram equals 1000 mg.
How many milligrams are in 10 grams?: 10 g equals 10000 mg.
How do I convert milligrams back to grams?: Use the reverse converter: 1 milligram equals 0.001 g.
Is this converter accurate?: Yes. It uses the exact SI/NIST definitions of each unit and shows up to 6 significant digits.