How many milligrams are in one gram?

One gram equals 1,000 mg. The formula is mg = g × 1,000.

How do I convert grams to milligrams?

Multiply the value in grams by 1,000. For example, 100 × 1,000 = 100,000 — so 100 g = 100,000 mg.

Pair · linear · factor 1,000

grams to milligrams

gmg

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grams · ≈ 0.1 kg (base)

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ggram100

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A glowing emerald beam balance: the kilogram prototype cylinder under a glass bell jar on one pan, old weights scattering into stars on the other, against a cosmic nebula in violet and magenta

Mass

Not all pounds are equal — how we weighed the world

Three different pounds in one kingdom, a Warsaw pound and a Prussian one, a probe burned up over Mars, a jetliner out of fuel over Canada — and a platinum cylinder near Paris that kept losing weight for a century, even though by definition it weighed exactly one kilogram. This is the history of mass units and its expensive mistakes.

12 min