Grams to Milligrams Converter
g → mg · ⚖️ Weight & Mass
1 Grams = 1,000 Milligrams
How to convert Grams to Milligrams
To convert Grams to Milligrams, multiply the value in Grams by 1,000. For example, 5 g = 5,000 mg.
If you need to convert from Grams to Milligrams, the key figure to remember is that one Grams equals 1,000 Milligrams. This page gives you a live calculator, a full reference table, and the underlying formula so you can convert g to mg with complete confidence.
Weight and mass conversions matter for cooking, shipping, fitness, science, and international trade. Although 'weight' and 'mass' are technically different concepts in physics, in everyday use the terms are interchangeable and the conversions are identical.
Understanding Grams and Milligrams
The kilogram is the SI base unit of mass and the reference point for the entire metric system. Pounds and ounces dominate in the United States, while stones remain common for body weight in the UK and Ireland. Metric tons (1,000 kg) and US tons (2,000 lb) appear in freight, agriculture, and industry — and because they differ by about 10%, confusing them is a frequent and costly mistake.
How accurate is this conversion?
The pound is defined as exactly 0.45359237 kilograms, a definition adopted internationally in 1959. This means kilogram-to-pound conversions are exact, not approximate, so you can rely on the figures in the table below for any purpose, from postage to laboratory work.
All conversion factors on ClearUnits are based on internationally recognised standards (the International System of Units, SI, and official definitions). Factors are reviewed for accuracy and the calculator uses full-precision values, rounding only the displayed result.
Quick reference: common Grams to Milligrams values
The most frequently searched conversions are 1 Grams = 1,000 Milligrams, 5 Grams = 5,000 Milligrams, 10 Grams = 10,000 Milligrams, and 100 Grams = 100,000 Milligrams. The full table further down covers every common value, and the calculator handles any number you need in between.
Pro tip: For shipping and postage, always check whether a quoted weight is in metric or US tons — the difference of roughly 93 kilograms per ton can change shipping classes and costs significantly.
Grams to Milligrams — Conversion Table
| Grams (g) | Milligrams (mg) |
|---|---|
| 0.1 g | 100 mg |
| 0.25 g | 250 mg |
| 0.5 g | 500 mg |
| 1 g | 1,000 mg |
| 2 g | 2,000 mg |
| 5 g | 5,000 mg |
| 10 g | 10,000 mg |
| 25 g | 25,000 mg |
| 50 g | 50,000 mg |
| 100 g | 100,000 mg |
| 250 g | 250,000 mg |
| 500 g | 500,000 mg |
| 1000 g | 1,000,000 mg |