How many grams are in 1 ounce?

One avoirdupois ounce equals approximately 28.3495 grams. For quick mental math, multiply ounces by 28 for a close estimate. Note: a troy ounce (for precious metals) is heavier at 31.1 grams.

How do I convert ounces to grams?

Multiply the number of ounces by 28.3495. For example, 8 oz × 28.3495 = 226.8 grams. For baking, rounding to 28 grams per ounce is usually close enough.

What is the difference between a fluid ounce and a weight ounce?

A fluid ounce measures volume (about 29.57 mL), while an ounce (avoirdupois) measures weight (about 28.35 g). They are different units that share a name, which often causes confusion in cooking.

Ounces to Grams (oz to g) Converter

1 oz = 28.3495 g

1 Ounce equals 28.3495 Grams (1 oz = 28.3495 g). Convert Ounces to Grams with formula, table, and examples.

One ounce equals approximately 28.3495 grams. Converting ounces to grams is essential for cooking, baking, nutrition tracking, postal services, and international food labeling wherever American and metric systems meet.

How to Convert Ounces to Grams

g = oz × 28.349523125

Multiply the value in Ounces by 28.349523125

Take your value in Ounces
Multiply by 28.349523125
Read the result in Grams

Common Ounces to Grams Conversions

Ounces (oz)	Grams (g)	Status
0.5 oz	14.1748 g
1 oz	28.3495 g
2 oz	56.699 g
3 oz	85.0486 g
4 oz	113.3981 g
5 oz	141.7476 g
6 oz	170.0971 g
8 oz	226.7962 g
10 oz	283.4952 g
12 oz	340.1943 g
16 oz	453.5924 g
24 oz	680.3886 g
32 oz	907.1847 g

Good to Know About Ounces to Grams Conversion

American recipes measure ingredients in cups, tablespoons, and ounces, while European recipes use grams. Professional bakers worldwide prefer grams for precision, as weight-based measurement is more accurate than volume-based.

Ounces to Grams: What You Need to Know

A recipe calling for 4 ounces of butter means about 113 grams. Nutrition labels on American products list serving sizes in ounces, while international labels use grams. The US Postal Service charges by the ounce for letters, while international mail uses grams. Coffee is sold by the ounce in the US and by the gram in Europe.

What is a Ounce? oz

An imperial and US customary unit of mass equal to approximately 28.35 grams. Commonly used in the US and UK for food and postal weight.

Imperial Us-customary food packaging (US/UK) postal weight cooking (US)

Learn more about Ounce →

What is a Gram? g

A metric unit of mass equal to one thousandth of a kilogram. Widely used in cooking, nutrition labeling, and science.

Metric cooking nutrition labels postal weight

Learn more about Gram →

Going the other way? Use our Grams to Ounces converter.

Ounces to Grams FAQ

One avoirdupois ounce equals approximately 28.3495 grams. For quick mental math, multiply ounces by 28 for a close estimate. Note: a troy ounce (for precious metals) is heavier at 31.1 grams.
Multiply the number of ounces by 28.3495. For example, 8 oz × 28.3495 = 226.8 grams. For baking, rounding to 28 grams per ounce is usually close enough.
A fluid ounce measures volume (about 29.57 mL), while an ounce (avoirdupois) measures weight (about 28.35 g). They are different units that share a name, which often causes confusion in cooking.

Non-Frequently Asked Questions About Ounces to Grams

Questions nobody should ask - but someone did.

Trick question: they are not even the same weight. Gold uses troy ounces (31.1 g) while feathers use avoirdupois ounces (28.35 g). An 'ounce' of gold is actually heavier than an 'ounce' of feathers. The imperial system is trolling you.
We are a unit conversion website and will not be commenting on the business practices of either industry. We will note that both could benefit from using consistent measurement standards.