How Many Grams in an Ounce? Weight Conversion Guide

The Answer: 28.3495 Grams per Ounce

One avoirdupois ounce (the standard ounce used for everyday weights) equals 28.3495 grams. For most practical purposes, people round this to 28.35 grams or simply 28 grams when precision isn't critical.

The formula: grams = ounces × 28.3495 | ounces = grams ÷ 28.3495

Grams to Ounces Conversion Chart

Grams	Ounces
1 g	0.035 oz
5 g	0.176 oz
10 g	0.353 oz
25 g	0.882 oz
28.35 g	1 oz
50 g	1.764 oz
100 g	3.527 oz
200 g	7.055 oz
250 g	8.818 oz
500 g	17.637 oz
1000 g (1 kg)	35.274 oz (2.205 lb)

Ounces to Grams Quick Reference

Ounces	Grams
1 oz	28.35 g
2 oz	56.7 g
4 oz (¼ lb)	113.4 g
8 oz (½ lb)	226.8 g
12 oz (¾ lb)	340.2 g
16 oz (1 lb)	453.6 g

Troy Ounce vs. Avoirdupois Ounce

There are two types of ounces used today:

• Avoirdupois ounce (1/16 of a pound): Used for food, body weight, and everyday items. = 28.3495 g
• Troy ounce: Used for precious metals (gold, silver). Slightly heavier = 31.1035 g

When you see gold prices quoted "per ounce," it's always the troy ounce. For cooking and general use, it's always the avoirdupois ounce.

Cooking: Why Grams Are More Accurate

Professional bakers worldwide use grams rather than ounces (or cups) because grams measure weight consistently. A cup of flour can weigh anywhere from 120g to 160g depending on how you scoop it, but a scale showing 140g is always exactly 140g. If you're baking from a recipe in grams, a kitchen scale is essential.