Ounces to Grams Converter

How to Convert Ounces to Grams?

Multiply the weight in ounces by 28.3495 to get grams. One ounce (oz) equals approximately 28.35 grams. Conversely, one gram equals 0.03527 ounces. An 8 oz steak weighs about 227 grams. A 100 g chocolate bar weighs about 3.53 ounces. Note that this conversion applies to avoirdupois ounces (weight). Fluid ounces (volume) are a different measurement. Enter any value in the converter above for instant weight conversion between ounces and grams.

Quick Reference Table

1 oz = 28.35 g. 2 oz = 56.70 g. 3 oz = 85.05 g. 4 oz = 113.40 g (quarter pound). 5 oz = 141.75 g. 6 oz = 170.10 g. 8 oz = 226.80 g (half pound). 10 oz = 283.50 g. 12 oz = 340.19 g (three quarters of a pound). 16 oz = 453.59 g (one pound). 24 oz = 680.39 g. 32 oz = 907.18 g (two pounds). For quick mental math, multiply ounces by 28 for a rough gram estimate (accurate within 1.2%).

Cooking and Baking Conversions

Recipes frequently mix ounce and gram measurements, especially when combining sources from different countries. Common cooking conversions: a stick of butter = 4 oz = 113 g. A cup of flour = about 4.5 oz = 125-130 g. A cup of sugar = about 7 oz = 200 g. Meat servings are typically 4-6 oz (113-170 g) per person. Chocolate chips: 1 cup = about 6 oz = 170 g. A "pinch" of salt is roughly 1 g (0.035 oz). Professional pastry chefs work exclusively in grams because gram measurements are more precise and consistent than ounce-based cup measurements for achieving reliable results.

Troy Ounces vs Avoirdupois Ounces

Gold, silver, and other precious metals are weighed in troy ounces, which are different from regular (avoirdupois) ounces. One troy ounce = 31.1035 grams (about 10% heavier than a regular ounce of 28.35 g). When gold is quoted at "$2,000 per ounce," it means per troy ounce. A troy pound contains only 12 troy ounces (373.24 g), while a regular pound contains 16 ounces (453.59 g). A troy pound is actually lighter than a regular pound despite the troy ounce being heavier. This distinction is critical for precious metal investors and jewelers who must use the correct ounce type in all weight calculations.

Postal and Shipping Weights

USPS First Class Mail pricing starts at 1 oz (28.35 g) for letters. Each additional ounce adds to the postage cost. A standard letter weighs about 0.16-0.25 oz (4.5-7 g) per sheet of paper. A standard No. 10 envelope weighs about 0.16 oz (4.5 g). Five sheets of paper plus envelope: approximately 1.05 oz (30 g), just over the 1 oz threshold for the base rate. International shipping typically uses grams and kilograms. Understanding oz-to-gram conversion helps optimize mailing costs and accurately declare package weights for customs.

Nutrition Labels

US nutrition labels list serving sizes in both grams and common measures (cups, pieces). Macronutrients (protein, fat, carbs) are listed in grams. Daily values are based on percentages. A serving of 28 g (1 oz) of chips, 85 g (3 oz) of meat, or 240 ml (8 fl oz) of milk. When tracking macros, food scales in grams are more precise than measuring in ounces because grams provide finer resolution (1 g vs 1 oz = 28.35 g). Most nutrition and fitness apps accept both units but work internally in grams for calculations.

What Are Cannabis and Pharmaceutical Measurement Standards?

Legal cannabis markets use a mix of ounces and grams. Common cannabis weights: 1 gram, 1/8 oz (3.5 g), 1/4 oz (7 g), 1/2 oz (14 g), 1 oz (28 g). Pharmaceutical compounds are measured in milligrams (mg) and micrograms for dosing precision. A standard aspirin tablet contains 325 mg (0.0115 oz). Drug dosages per body weight are calculated in mg per kg. Understanding the relationship between ounces, grams, and milligrams is essential for proper medication dosing, supplement intake, and compliance with legal purchase limits in regulated markets.

Ounces to Grams for International Shopping

When shopping internationally, product weights are listed in grams or kilograms. A 12 oz bag of coffee is 340 g. A 16 oz jar of peanut butter is 454 g. European groceries commonly package items in 100 g, 250 g, 500 g, and 1 kg sizes. Price comparison between US and international products requires converting the weight units first, then calculating the per-unit price. Many online retailers now display both units, but understanding the conversion yourself lets you verify prices and make informed purchasing decisions when shopping across borders.

Frequently asked questions