Milligrams to Grams Converter: Simple and Accurate

The formula

1 gram = 1,000 milligrams, so converting mg to g means dividing by 1,000. The field recalculates as you type: enter 500 and the grams field shows 0.5 — the size of a standard 500mg paracetamol/acetaminophen tablet, expressed in grams.

Where this precision matters

Milligram-to-gram conversion shows up most often in dosing and lab work, where the difference between 0.5 g and 5 g is a 10x error. The output field here is a disabled number input (no manual editing, no rounding applied) — it shows the exact quotient, so 250 mg reads as 0.25 g rather than a rounded approximation.

Common reference values