Grams to Ounces Converter
Convert grams to ounces, pounds and kilograms in one step.
How to use this grams to ounces
- 1Enter your weight in grams.
- 2The converter shows ounces, pounds, and kilograms instantly.
- 3For cooking and baking, grams are the professional standard — use the ounces output to convert to US recipe measurements.
- 4For precious metals and jewelry, note that Troy ounces (31.1 g) are different from avoirdupois ounces (28.35 g) — this calculator uses the standard avoirdupois ounce.
- 5For shipping, letter weights are typically in grams internationally and ounces in the US — use this to determine correct postage.
- 6For food labeling, nutrition information per serving may be in grams — convert to ounces to understand US portion sizes.
How it's calculated
oz = g ÷ 28.3495. 1 oz = 28.3495 g.
About the Grams to Ounces
Grams and ounces are the small-scale weight units that appear most frequently in cooking, food measurement, personal care products, and shipping. Grams are the metric standard used globally; ounces are the US customary unit for everyday small weights. The conversion factor is 1 ounce = 28.3495 grams (avoirdupois ounce), a number worth remembering if you cook with both US and international recipes.
Cooking and baking are the highest-volume use case for grams-to-ounces conversion. Professional baking has adopted grams as the standard because weight measurement is more precise than volume measurement — a cup of flour can vary by 50% in actual mass depending on how packed it is, but 120 grams of flour is always exactly 120 grams. International baking recipes, professional cookbooks, and precision recipes like bread, pastry, and chocolate work almost always use grams. Converting to ounces or cups for US kitchens that lack a scale is a constant need.
The troy ounce distinction is critically important in precious metals contexts and causes significant confusion. Gold, silver, platinum, and palladium prices are quoted per troy ounce (31.1035 g), not per standard avoirdupois ounce (28.3495 g). The troy ounce is about 10% heavier than the standard ounce. When calculating the value of gold in grams, using the wrong ounce definition introduces a 10% error. This calculator uses the standard avoirdupois ounce — for precious metals, divide grams by 31.1035 instead.
Food labeling creates grams-to-ounces conversion needs for consumers comparing nutritional information. US food labels are required to show serving sizes in both metric and US customary units: "1 serving (30 g / 1 oz)" for cereal, or "2 tablespoons (32 g)" for peanut butter. International food products sold in the US may list net weight in grams first; comparing these to US-labeled products in ounces requires conversion.
Pharmaceutical and medical dosing always uses grams, milligrams, and micrograms — the metric system is the universal standard in medicine worldwide. While drug doses themselves are too small to need ounce conversion, body weight for dosing calculations may need to be converted from lbs to kg (not ounces). For over-the-counter medications that list dosage instructions in different markets, understanding the gram-ounce relationship helps verify that instructions from different countries are equivalent.
Frequently asked questions
How many ounces is 100 grams?
100 g ÷ 28.3495 = 3.527 ounces. Common food weight conversions: 28 g ≈ 1 oz, 100 g ≈ 3.5 oz, 250 g ≈ 8.8 oz, 500 g ≈ 17.6 oz, 1,000 g (1 kg) ≈ 35.27 oz (2.2 lbs).
How many grams is 1 ounce?
1 avoirdupois ounce = 28.3495 grams exactly. Note: 1 troy ounce (used for gold, silver, and precious metals) = 31.1035 grams — 9.7% heavier than the standard ounce.
How many grams is 8 ounces?
8 oz × 28.3495 = 226.796 grams, commonly rounded to 227 g. This is half a pound. Many US recipes call for 8 oz of an ingredient — equivalent to just under 230 grams.
Why does gold use troy ounces instead of regular ounces?
The troy ounce (31.1035 g) is a medieval unit derived from the Troyes trade fair in France, historically used for precious metals and gemstones. The standard avoirdupois ounce (28.35 g) is used for everything else. When buying or selling gold, silver, or platinum, prices are quoted per troy ounce — a 1-ounce gold coin weighs 31.1 g, not 28.35 g.
How many grams in a cup of flour?
A US cup of all-purpose flour weighs approximately 120–130 grams when properly measured (spooned into the cup and leveled). Packed flour can weigh 150–160 g per cup, which is why baking recipes increasingly use grams for precision. Other common cups to grams: 1 cup sugar = 200 g, 1 cup butter = 227 g, 1 cup rice = 185 g.