MG to G Converter
Enter a value with mcg, mg, g, or kg. A number without a unit is treated as milligrams.
Convert and total a list
MG to grams formula
One gram is exactly 1,000 milligrams. Convert with g = mg ÷ 1,000. To reverse the direction, use mg = g × 1,000. Therefore 500 mg is exactly 0.5 g.
Micrograms, milligrams, grams, and kilograms
| Unit | Equivalent |
|---|---|
| 1 mcg (µg) | 0.001 mg |
| 1 mg | 1,000 mcg |
| 1 g | 1,000 mg |
| 1 kg | 1,000 g |
Batch conversion and total
Batch mode accepts up to 100 non-empty lines and preserves each original line number. Valid standalone masses are added using exact decimal arithmetic. An invalid row stays visible instead of erasing the valid conversions or being silently treated as zero.
Scope and safety
This is a unit converter, not a dosage calculator. It rejects slash and “per” notation such as mg/kg because converting a compound dose requires the referenced quantity and appropriate professional context. Do not use this page to choose or adjust medication.
Accepted input
Use a nonnegative decimal with mcg, µg, μg, microgram, mg, milligram, g, gram, kg, or kilogram. A bare number means mg. Each value allows up to 18 whole-number digits and 12 decimal places; commas, fractions, exponent notation, negative values, and unrelated units are rejected.
Frequently asked questions
How do I convert mg to g?
Divide milligrams by 1,000. For example, 500 mg ÷ 1,000 = 0.5 g. The relationship is exact.
How many milligrams are in one gram?
One gram is exactly 1,000 milligrams. Therefore 0.5 g is 500 mg and 2.25 g is 2,250 mg.
What is the difference between mcg and mg?
One milligram is exactly 1,000 micrograms. The abbreviations mcg, µg, and μg all refer to micrograms on this page.
Can I total several mg and g values?
Yes. Open batch mode and enter up to 100 masses, one per line. Valid rows are converted and totaled while invalid rows keep their line numbers and errors.
Can this convert mg/kg doses?
No. mg/kg is a compound amount per body mass and requires additional context. This page only converts standalone mass units and provides no medication or dosing advice.