How many grams are in one ounce?

One avoirdupois ounce equals exactly 28.349523125 grams. One troy ounce equals exactly 31.1034768 grams. The troy ounce is about 10% heavier than the common ounce.

What is the difference between a regular ounce and a troy ounce?

The avoirdupois ounce (28.35 g) is used for everyday goods — food, postal weight, body weight. The troy ounce (31.10 g) is a historical unit still used exclusively for precious metals like gold, silver, and platinum.

Can I convert fractions of an ounce?

Yes. Enter any decimal value such as 0.5 (half ounce) or 2.75. The tool handles fractions to full precision.

Is this tool accurate enough for cooking?

Yes. The conversion factor is defined to nine decimal places, which far exceeds the precision of any kitchen scale. Results are displayed to two decimal places for readability.

How do I convert grams back to ounces?

Click the swap arrows button between the two fields. The converter flips direction and recalculates automatically.

Ounces to Grams Converter

Type any ounce value and get the exact gram equivalent instantly — supports avoirdupois and troy ounce units.

Weight Input

Ounce Type

Ounces (oz)

Grams (g)

Common Conversions

Avoirdupois ounces

oz	g

1 avoirdupois oz = 28.3495 g

1 troy oz = 31.1035 g

Copied!

Summary

This tool converts a weight value from ounces (oz) to grams (g) in real time. It supports both the standard avoirdupois ounce (used in everyday cooking and commerce) and the troy ounce (used for precious metals and gemstones). Simply enter a number and the gram result updates instantly.

How it works

Enter a weight value in ounces in the input field.
Select the ounce type: avoirdupois (common) or troy (precious metals).
The gram equivalent is calculated and displayed immediately.
Use the swap button to reverse the conversion from grams to ounces.
Copy the result to your clipboard with one click.

Use cases

Convert recipe ingredients from ounces to grams for precise baking.
Calculate precious metal weights when buying or selling gold and silver.
Convert food labels for international nutritional tracking.
Verify postal or shipping weights across different measurement systems.
Convert jewelry weights between troy ounces and grams.
Help students with unit-conversion homework and science labs.

Frequently Asked Questions

Last updated: 2026-06-04 · Reviewed by Nham Vu