Ounces to Grams Converter

Convert oz to g with precision for baking, cooking and weighing

Ounces (oz)

Grams (g)

Decimal Precision

Quick Conversions

Popular Ounces to Grams Conversions

These conversion values are commonly referenced in baking recipes, cooking measurements and food packaging across the UK and internationally.

Ounces (oz)	Grams (g)	Common Use
1 oz	28.35 g	Small ingredient portions
2 oz	56.70 g	Butter, cheese portions
4 oz	113.40 g	Flour, sugar measures
8 oz	226.80 g	Half pound portions
12 oz	340.19 g	Beverage containers
16 oz	453.59 g	1 pound equivalent
0.5 oz	14.17 g	Spices, yeast packets
0.25 oz	7.09 g	Small spice amounts

Conversion Formula and Method

Standard Conversion Formula

Grams = Ounces × 28.349523125

This precise conversion factor is defined by international measurement standards. For everyday purposes, the rounded value of 28.35 grams per ounce provides sufficient accuracy.

Step-by-Step Conversion Process

Identify the number of ounces you need to convert
Multiply the ounce value by 28.35 (or 28.349523125 for precision)
The result represents the equivalent weight in grams
Round to your desired decimal places based on your requirements

Reverse Conversion: Grams to Ounces

Grams to Ounces Formula

Ounces = Grams ÷ 28.349523125

Alternatively, multiply grams by 0.03527396 to obtain ounces.

Visual Weight Comparisons

These examples help visualise common ounce to gram conversions in familiar contexts.

Baking Flour

4 oz = 113 g

Standard flour portion for small batches

Butter Block

8 oz = 227 g

Half-pound butter package

Chocolate Bar

3.5 oz = 99 g

Typical chocolate bar size

Coffee Beans

12 oz = 340 g

Standard coffee bag

Extended Conversion Table

Comprehensive reference covering fractional and whole ounce measurements commonly found in recipes and product labelling.

Ounces (oz)	Grams (g)	Ounces (oz)	Grams (g)
0.1 oz	2.83 g	10 oz	283.50 g
0.5 oz	14.17 g	15 oz	425.24 g
1 oz	28.35 g	20 oz	566.99 g
2 oz	56.70 g	25 oz	708.74 g
3 oz	85.05 g	30 oz	850.49 g
4 oz	113.40 g	40 oz	1133.98 g
5 oz	141.75 g	50 oz	1417.48 g
6 oz	170.10 g	100 oz	2834.95 g

Important Measurement Distinctions

Weight Ounces vs Fluid Ounces

Weight ounces (oz) measure mass and convert directly to grams as shown on this page.

Fluid ounces (fl oz) measure volume, not weight. The gram equivalent of fluid ounces varies depending on the substance’s density. For water, 1 fl oz ≈ 29.57 g, but this differs for other liquids.

Types of Ounce Measurements

Avoirdupois ounce: The standard ounce used in everyday weighing (28.349523125 g). This is the measurement referenced throughout this page.

Troy ounce: Primarily used for precious metals like gold and silver (31.1034768 g), heavier than the standard ounce.

Metric ounce: An informal term sometimes referring to 25 or 30 grams, though not an official SI unit.

Frequently Asked Questions

How many grams are in one ounce?

One ounce equals exactly 28.349523125 grams. For practical purposes, this is commonly rounded to 28.35 grams. This conversion applies to avoirdupois ounces, the standard measurement for food and everyday items.

Is 100 grams equal to 4 ounces?

No, 100 grams equals approximately 3.53 ounces. Four ounces converts to 113.40 grams. This is a common misconception when converting between metric and imperial measurements.

Why do recipes use both ounces and grams?

Recipes vary based on regional preferences. American recipes typically use ounces and imperial measurements, whilst UK and European recipes increasingly favour grams and metric units. Many modern cookbooks provide both to accommodate international audiences.

Can I use the same conversion for fluid ounces?

No. Weight ounces and fluid ounces are different measurements. Weight ounces measure mass, whilst fluid ounces measure volume. The gram equivalent of fluid ounces depends on the substance’s density. Always check whether a recipe specifies weight (oz) or volume (fl oz).

How precise do I need to be when baking?

Baking requires more precision than general cooking. For best results, use measurements rounded to 2 decimal places (e.g., 28.35 g). Professional bakers often weigh ingredients in grams as it provides greater accuracy than volume measurements.

What is the difference between UK and US ounces?

For weight measurements, UK and US ounces are identical – both equal 28.35 grams. However, fluid ounces differ: a US fluid ounce is approximately 29.57 ml, whilst a UK (imperial) fluid ounce is 28.41 ml.