Mass Unit Converter
Convert between grams, kilograms, and avoirdupois ounces in your browser with precise bidirectional results and clear unit definitions.
A QUICK WALKTHROUGH
How to use this tool
- Enter a mass and choose its unit.
- Select Convert mass to calculate all three units.
- Review or copy the local conversion result.
Three mass units
Convert grams, kilograms, and avoirdupois ounces in either direction. The calculation uses the exact international relationship 1 avoirdupois oz = 28.349523125 g.
Avoirdupois versus troy ounces
This tool uses the everyday avoirdupois ounce, not the troy ounce used for precious metals. A troy ounce is 31.1034768 g, so it must not be substituted for an avoirdupois ounce.
Private browser conversion
Parsing, validation, and conversion happen locally in your browser. No mass value is uploaded or stored by this page.
GOOD TO KNOW
Common questions
How many grams are in an avoirdupois ounce?
Exactly 28.349523125 grams.
Is this a troy-ounce converter?
No. It uses the avoirdupois ounce. A troy ounce is 31.1034768 grams and is used for precious metals.
Can I convert in both directions?
Yes. Choose any of the three units as the input and the result shows all three units.
Does the converter upload my value?
No. The conversion runs entirely in your browser.