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Ounce to Milligram Converter

Instant, two-way conversion across common engineering units.

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1 oz = 28,349.523 mg(Ounce → Milligram)

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Converting ounces to milligrams

To convert ounces to milligrams, multiply the value by 28,349.523. Mass conversions support load take-offs, steel tonnage and transport limits, where imperial and metric figures often appear in the same package.

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To scale
1 ounce = 28,349.523 milligrams.≈ 28.35K milligrams
1 milligram = 0.000035273962 ounces.≈ 35.3 millionths of an ounce

Ounce (oz)

The ounce (oz) is the small unit of the avoirdupois mass system.

Origin
One sixteenth of the avoirdupois pound, standardized internationally in 1959.
Where it is used
Used for coatings, hardware weights and product data in US practice.
Relation to SI
1 oz = 0.028349523125 kg exactly.

Milligram (mg)

The milligram (mg) is one thousandth of a gram.

Origin
A decimal subdivision of the SI kilogram.
Where it is used
Used in material testing, chemistry and admixture dosing.
Relation to SI
1 mg = 0.000001 kg.

Frequently asked questions

How many milligrams are in one ounce?

1 oz equals 28,349.523 mg.

How do I convert ounces to milligrams?

Multiply the value by 28,349.523. For example, 10 oz equals 283,495.23 mg.

How do I convert back from milligrams to ounces?

1 mg equals 0.000035273962 oz. The converter above works in both directions, so you can type into either field.

Is this converting mass or weight?

Mass. Kilograms and pounds measure mass; force units such as newtons or kilonewtons are a separate quantity used in structural load calculations.

What is the difference between a US ton and a metric tonne?

A US short ton is 2,000 lb, about 907 kg, while a metric tonne is exactly 1,000 kg. The imperial long ton is 2,240 lb, about 1,016 kg.

Is this mass converter free to use?

Yes. Every unit conversion runs in your browser, needs no account and is free for professional use.

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