Convert mg to g
Convert mg to g instantly. 1 mg = 0.001 g. Formula, worked examples and a quick reference table.
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One milligram equals 0.001 grams. To convert any number of milligrams to grams, multiply by 0.001.
The converter above works in both directions and updates as you type. Below you will find the formula, a worked example and a reference table of common values.
Weight and mass conversions matter most in three places: shipping, where a rate band can turn on a single kilogram; cooking, where recipes cross between metric grams and imperial ounces; and personal weight, where Britain and Ireland use stones, the United States uses pounds, and everywhere else uses kilograms. Strictly these are mass units rather than weight units, and the distinction only bites in physics, where weight is a force measured in newtons.
mg to g formula
To go the other way, use milligram = gram ÷ 0.001.
About these units
The milligram is a thousandth of a gram, and the standard unit for medicine doses and nutrition labels, where the quantities are far too small for grams to be readable.
The gram is a thousandth of a kilogram. It is the base unit of nearly every recipe outside the US, and the reason kitchen scales beat cup measures for consistency.
Milligram is also written milligramme and milligrams. Gram is also written gramme, grammes, grams, gm and gms.
Sources
mg to g conversion table
| Milligram | Gram |
|---|---|
| 1 mg | 0.001 g |
| 2 mg | 0.002 g |
| 3 mg | 0.003 g |
| 5 mg | 0.005 g |
| 10 mg | 0.01 g |
| 20 mg | 0.02 g |
| 25 mg | 0.025 g |
| 50 mg | 0.05 g |
| 100 mg | 0.1 g |
| 250 mg | 0.25 g |
| 500 mg | 0.5 g |
| 1,000 mg | 1 g |
Frequently asked questions
How many grams are in a milligram? +
There are 0.001 grams in one milligram.
What is 10 mg in g? +
10 mg equals 0.01 g. Multiply 10 by 0.001.
How do I convert gram back to milligram? +
Use milligram = gram ÷ 0.001. The converter above handles both directions, or see our dedicated g to mg page.
How accurate is this milligram to gram conversion? +
The factor used is 0.001, carried at full double precision. Where a unit has an exact legal definition the factor is exact rather than approximate. Rounding is applied only to the displayed result, so the answer is never a calculation done on an already-rounded number.
Is there a quick way to estimate mg to g in my head? +
Divide by 1,000. That matches the true factor of 0.001 exactly, so no adjustment is needed for a mental estimate.