Grams to Milligrams Converter
Convert grams to milligrams. The formula used here is 1 gram = 1000 milligrams. The formula is mg = g × 1000; 1 g is 1,000 mg.
A metric mass unit used for food, lab, and everyday weights.
A metric mass unit equal to one thousandth of a gram.
Start with your value in grams, then apply the formula below. It stays visible so you can catch rounding mistakes instead of just copying the output.
For freight, food, medicine, and fitness work, keep enough decimal places to match the measuring device and round the displayed value only after the conversion.
Most weight conversions here use exact defined relationships between metric and avoirdupois units, so the main accuracy limit is the input measurement itself. This page displays converted values with up to 3 decimal places by default.
| Grams | Milligrams |
|---|---|
| 1 g | 1,000 mg |
| 5 g | 5,000 mg |
| 10 g | 10,000 mg |
| 100 g | 100,000 mg |
| 500 g | 500,000 mg |
| 1,000 g | 1,000,000 mg |
Useful for checking parcel and freight weights. Use the same formula with your exact input if the measurement needs to be documented.
Useful for scaling recipes or reading nutrition labels. Use the same formula with your exact input if the measurement needs to be documented.
Useful for fitness, health, and lab measurements. Use the same formula with your exact input if the measurement needs to be documented.
How do I convert grams to milligrams?
Enter the value in grams and apply mg = g × 1000. Round the milligrams result after the conversion, not before.
What is 1 gram in milligrams?
1 g equals 1,000 mg with the current rounding setting. Keep more decimal places when the result feeds another calculation.
What is 5 g in mg?
5 g is 5,000 mg. It appears in the lookup table so you can compare it with nearby amounts.
Can I convert milligrams back to grams?
Yes. Use the reverse Milligrams to Grams converter if you need to go the other direction.
How accurate is this grams to milligrams conversion?
The calculator runs the formula in your browser and rounds results to 3 decimal places by default. Most weight conversions here use exact defined relationships between metric and avoirdupois units, so the main accuracy limit is the input measurement itself.