mg to g Converter

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Convert milligrams to grams with the SI relation 1 g = 1,000 mg. A 500 mg paracetamol tablet is 0.5 g; a 1,000 mg vitamin C dose is exactly 1 g. Pharmacists, food scientists and analytical chemistry students reach for this conversion daily when pill totals or assay yields need rolling up into gram-precision summary figures. Browser-local.

Milligram (mg)
Gram (g)

Milligram (mg) → Gram (g)

Quick reference table

Milligram (mg)Gram (g)
1 mg0.001 g
2 mg0.002 g
5 mg0.005 g
10 mg0.01 g
25 mg0.025 g
50 mg0.05 g
100 mg0.1 g

Glossary

Milligram (mg)

A milligram is one thousandth of a gram and one millionth of a kilogram (1 mg = 0.001 g). It is the standard unit for medication dosages, vitamin labelling, fine-chemistry measurements and food nutrient content. A typical aspirin tablet is around 325 mg; a daily vitamin C dose is often 60–1000 mg.

Gram (g)

A gram is one thousandth of a kilogram (1 g = 1000 mg = 0.001 kg). It is the everyday metric unit for cooking ingredients, postal weights, jewellery and small-package retail. One US nickel weighs 5 g; a standard letter envelope tops out at about 30 g for the lowest postage tier.

Metric system (SI)

The metric system is a decimal system of measurement built around the kilogram for mass, the meter for length and the second for time, with multiples and submultiples expressed as powers of ten (milligram, gram, tonne). Adopted in France in 1799 and codified internationally as the International System of Units (SI) in 1960, it is now the official system in nearly every country and the standard in science.

Imperial / US Customary system

The imperial system is the historical English system of weights and measures whose mass units are the ounce, pound, stone and ton (16 oz = 1 lb, 14 lb = 1 stone, 2,000 lb = 1 US short ton). Codified by the British Weights and Measures Act of 1824 and aligned with US Customary by the 1959 international yard-and-pound agreement (1 lb = 0.45359237 kg exactly), it is still used in the United States and the United Kingdom for everyday weights.

Related tools

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