Milligrams to Grams Converter

Convert small metric masses exactly

Milligrams and grams are decimal metric mass units separated by a factor of one thousand. The conversion is useful for labels, laboratory notes, formulations, and technical specifications. This page handles the unit arithmetic without interpreting what the measured substance is or how it should be used.

The default 1,000 milligrams converts to exactly 1 gram. Reversing direction converts 1 gram to exactly 1,000 milligrams. Decimal inputs are accepted, but the meaningful precision of the result still depends on the measuring instrument and source data.

Private unit math with a medical boundary

Values stay in your browser and are not uploaded. The converter does not calculate medication doses or assess product safety. Prescription and over-the-counter dosing must follow the label and advice from a qualified healthcare professional, especially when concentrations or body weight are involved.