Ounces to Grams Converter (oz to g) – Accurate Weight Calculator

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Convert weight between ounces (oz) and grams (g) instantly with high mathematical precision. Easily switch between everyday standard avoirdupois ounces for kitchen recipes, baking, and shipping, and troy ounces (ozt) for gold, silver, and precious metals bullion.

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Live Weight Converter

Direction: Ounces to Grams (oz → g)

1 oz = 28.34952 g (Everyday / Kitchen)

Weight in Ounces (oz) oz

Converted to Grams (g) g

28.35

Quick Conversion Presets:

Mathematical Formula:


          1 oz × 28.34952 = 28.35 g

Exact Precision (6 Decimals): 28.349523 g

Kilograms (kg) 0.0283 kg

Pounds (lb) 0.0625 lb

Milligrams (mg) 28,350 mg

Troy Ounces (ozt) 0.9115 ozt

How to Convert Ounces to Grams

The mathematical conversion between ounces and grams depends on whether you are measuring ordinary dry weight (such as groceries, cooking ingredients, or postal shipping) or precious metals (such as gold, silver, and bullion). Here are the exact mathematical formulas established by international weight standards:

1. Standard Avoirdupois Ounce (Everyday & Kitchen Weight)

One international avoirdupois ounce is defined as exactly 28.349523125 grams (commonly rounded to 28.35 g).

To Convert Ounces to Grams: Weight (g) = Weight (oz) × 28.34952

To Convert Grams to Ounces: Weight (oz) = Weight (g) ÷ 28.34952

Example: A recipe calls for 4 ounces of grated cheddar cheese.
4 oz × 28.3495 = 113.40 grams.

2. Troy Ounce (Precious Metals: Gold, Silver, Platinum)

In financial and bullion markets, all precious metals are weighed exclusively in Troy Ounces (ozt). One troy ounce is defined as exactly 31.1034768 grams (commonly rounded to 31.10 g).

To Convert Troy Ounces to Grams: Weight (g) = Weight (ozt) × 31.10348

To Convert Grams to Troy Ounces: Weight (ozt) = Weight (g) ÷ 31.10348

Important Note: A troy ounce is 9.7% heavier than an everyday standard ounce (31.10 g vs. 28.35 g). If you buy a 1 oz gold coin, you are receiving 31.10 grams of fine gold, not 28.35 grams!

Quick Ounces to Grams Conversion Table

The table below provides exact conversions for the most frequent culinary, postal, and everyday weights, including common fractions and pound equivalents:

Ounces (oz)	Grams (Exact / Rounded)	Pounds (lb)	Common Everyday / Kitchen Usage
1/4 oz (0.25 oz)	7.09 g	0.0156 lb	Standard single packet of dry active yeast
1/2 oz (0.50 oz)	14.17 g	0.0313 lb	1 US tablespoon of butter
1 oz (1.00 oz)	28.35 g	0.0625 lb	Single deli slice of cheese, snack bag portion
2 oz (2.00 oz)	56.70 g	0.1250 lb	1/4 cup butter (half a stick), double espresso
4 oz (1/4 lb)	113.40 g	0.2500 lb	1 standard stick of butter, quarter-pound burger
6 oz (6.00 oz)	170.10 g	0.3750 lb	Individual cup of yogurt, small chicken breast
8 oz (1/2 lb)	226.80 g	0.5000 lb	1 standard block of cream cheese (half pound)
12 oz (3/4 lb)	340.19 g	0.7500 lb	Standard bag of chocolate chips / coffee beans
16 oz (1.00 lb)	453.59 g	1.0000 lb	Exactly 1 pound (standard supermarket grocery loaf)
32 oz (2.00 lb)	907.18 g	2.0000 lb	Exactly 2 pounds (0.907 kg)

Metric Milestones to Ounces

100 g = 3.527 oz Standard chocolate bar

250 g = 8.818 oz Standard European butter block

500 g = 17.637 oz (1.10 lb) Half kilogram package

1,000 g (1 kg) = 35.274 oz (2.20 lb) One standard kilogram

Dry Ounces (Weight) vs. Fluid Ounces (Volume): What is the Difference?

One of the most frequent mistakes in kitchen baking and packaging is confusing dry ounces (oz) with fluid ounces (fl oz). Although both share the word “ounce”, they measure entirely different physical properties:

Dry Ounce (oz) = Mass / Weight

A dry ounce is a unit of weight measured on a kitchen or postal scale. 1 dry ounce is always equal to 28.35 grams, regardless of whether you are weighing feathers, flour, butter, or lead.

Fluid Ounce (fl oz) = Volume / Capacity

A fluid ounce is a unit of volume (liquid capacity) measured with liquid measuring jugs. In the United States, 1 US fluid ounce equals 29.57 milliliters (mL). In the Imperial system, 1 fl oz equals 28.41 mL.

Why 1 Fluid Ounce Does NOT Always Weigh 1 Ounce (The Density Effect)

Pure water has a density very close to 1 g/mL, so 1 fluid ounce of water weighs approximately 1.04 dry ounces (29.57 grams). However, for other common ingredients, density changes the weight dramatically:

Ingredient	Volume (fl oz)	Actual Weight in Grams	Actual Weight in Dry Ounces	Comparison to Water
Pure Water	1 fl oz	29.57 g	1.04 oz	Baseline
Honey / Molasses	1 fl oz	42.00 g	1.48 oz	+42% heavier than water
Olive / Vegetable Oil	1 fl oz	27.20 g	0.96 oz	-8% lighter than water
Granulated Sugar	1 fl oz	25.00 g	0.88 oz	-15% lighter than water
All-Purpose Flour (aerated)	1 fl oz	15.60 g	0.55 oz	-47% lighter than water

Kitchen Tip: Because measuring flour in volumetric cups can fluctuate by up to 25% depending on how tightly packed it is, professional bakers always weigh flour in grams on a digital scale for consistent, foolproof results.

Frequently Asked Questions (FAQ)

How many grams are in 1 ounce?

In the standard avoirdupois system used for groceries, cooking, and freight, 1 ounce equals exactly 28.349523125 grams, which is usually rounded to 28.35 grams. However, in the troy system used for precious metals like gold and silver, 1 troy ounce equals 31.1034768 grams.

What is the difference between an avoirdupois ounce and a troy ounce?

An avoirdupois ounce (28.35 g) is the standard ounce used in the United States and the UK for everyday commodities, food, and human weight, with 16 ounces making up 1 avoirdupois pound (453.59 g). A troy ounce (31.10 g) is an ancient unit of mass retained exclusively for trading precious metals (gold, silver, platinum, palladium), where 12 troy ounces make up 1 troy pound (373.24 g). A troy ounce is roughly 9.7% heavier than an avoirdupois ounce.

Does 1 ounce of flour equal 1 ounce of water?

By weight (dry ounces): YES. One dry ounce of flour weighs exactly 28.35 grams, just as one dry ounce of water weighs 28.35 grams. Weight is weight.

By volume (fluid ounces): NO. One fluid ounce of water weighs about 29.57 grams, whereas one fluid ounce of all-purpose flour weighs only about 15.6 grams because flour has a much lower density and contains trapped air pockets.

How do I convert ounces to grams in my head?

A simple mental math shortcut is to multiply the number of ounces by 30, then subtract about 5% of the total. For example:
For 4 ounces: 4 × 30 = 120. Subtract 5% (6) = 114 grams (the exact value is 113.40 g). This quick mental trick gives you within 0.5% accuracy in seconds!

How many ounces are in 100 grams and 500 grams?

• 100 grams = 3.5274 ounces (standard) or 3.215 troy ounces.
• 500 grams (half a kilogram) = 17.6370 ounces (approximately 1 pound 1.6 ounces).