Mass Converter

Convert mass between grams, kilograms, milligrams, pounds, ounces and atomic mass units.

Open in the full calculator → — with every other tool, the AI tutor and PNG export.

How it converts

Result = value × (factor of the unit you convert from) ÷ (factor of the unit you convert to), every factor being the size of the unit in g:
1 kg = 1000 g
1 mg = 0.001 g
1 lb = 453.592 g
1 oz = 28.3495 g
1 amu = 1.66054 × 10-24 g

Worked example

1 lb = 1 × 453.592 ÷ 1 = 453.592 g.

Quick reference

Second worked example

250 g = 250 × 1 ÷ 28.3495 = 8.8185 oz.

Common values

Worked out with the same factors the converter uses.

Common mistakes

Learn the method

About this converter

One of the unit converters in the Chemistry Calculator Suite, alongside its chemistry, physics and maths tools. Nothing is behind a login and no value you type is sent anywhere — the conversion runs in your own browser.

The Mass converter above is the live tool — it converts right here on the page. The link under it opens the full suite with this set already selected.

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