Milligrams (mg) to Grams (g) Converter
Enter a value to instantly convert between weight units.
1 Milligram = 0.001 Gram
Key Formulas
Kilogram → Pound
lb = kg × 2.20462Pound → Kilogram
kg = lb × 0.453592Gram → Ounce
oz = g × 0.035274Ounce → Gram
g = oz × 28.3495Formula
g = mg ÷ 1000The gram is the everyday metric unit for moderate masses — food portions, chemical reagents, small packages. When you need to convert from the smaller milligram unit, you divide by 1000. A milligram is one-thousandth of a gram, so 500 mg = 0.5 g, and 2500 mg = 2.5 g. This conversion is essential when working between pharmaceutical labels (often in mg) and metric documentation (often in g).
Source: NIST SP 811, Table B.8
Frequently Asked Questions
Real-World Examples
A nutrition label lists 500 mg of sodium per serving — expressed as 0.5 g for the database.
500 mg = 0.5 g
A laboratory sample containing 2500 mg of compound translates to 2.5 g for the report.
2500 mg = 2.5 g
A trace element analysis shows 100 mg of a contaminant — 0.1 g for the environmental report.
100 mg = 0.1 g
A batch of supplement tablets totals 15,000 mg of active ingredient — 15 g for the production record.
15000 mg = 15 g