swap_horiz Need milligrams to grams instead?

3 Grams to Milligrams

3 grams equals 3,000 milligrams. Use the formula, worked example, and conversion table below to check the math.

3 g = 3,000 mg
g × 1,000 = mg
Try: 2 g to mg 4 g to mg 8 g to mg
3 g is also
3 g = 0.003 kg 3 g = 0.006614 lb 3 g = 0.1058 oz 3 g = 0.000472 st 3 g = 0.000003 t
g
3,000 mg

Formula and Step-by-Step

g × 1,000 = mg
  1. Start with 3 g
  2. Multiply by 1,000: 3 × 1,000 = 3,000
  3. Result: 3 g = 3,000 mg

Since 1 gram equals 1,000 milligrams, multiply any gram value by 1,000 to convert.

Other Gram to Milligram Values

Grams (g) Milligrams (mg)
1 g 1,000 mg
2 g 2,000 mg
3 g 3,000 mg
5 g 5,000 mg
10 g 10,000 mg
15 g 15,000 mg
20 g 20,000 mg
25 g 25,000 mg
50 g 50,000 mg
75 g 75,000 mg
100 g 100,000 mg
250 g 250,000 mg
500 g 500,000 mg
1,000 g 1,000,000 mg
calculate Gram to Milligram Converter swap_horiz Milligram to Gram Converter functions Gram to Milligram Formula scale All Weight / Mass Conversions

Frequently Asked Questions

3 grams equals 3,000 milligrams.
The formula is: g × 1,000 = mg. See the g to mg formula page for worked examples.
Use the milligrams to grams converter. The reverse formula is: mg ÷ 1,000 = g.
The calculator uses the full-precision conversion factor for accuracy. Table values and displayed results are rounded for readability.
The conversion formula (g × 1,000 = mg) is based on internationally defined standards. Displayed results are rounded for readability, while the calculator uses the full-precision factor.
person Written by Sean Day verified Reviewed by UnitCompare update Last updated Mar 28, 2026