Grams to Ounces Calculator - Convert g to oz

About the Grams to Ounces Calculator

Grams are the standard small unit of weight in kitchens, laboratories, post offices and shops across most of the world, while ounces are used in American recipes, food packaging, postage and — as troy ounces — for gold and silver. Converting grams to ounces is essential when following an American recipe with metric scales, comparing package sizes, or pricing precious metals.

This grams to ounces calculator converts grams to ounces exactly. It also gives the weight in pounds (or pounds and ounces for heavier amounts), in troy ounces for precious metals, and rounded to the nearest quarter ounce for cooking.

How to Use the Grams to Ounces Calculator

Enter the weight in grams.

The ounces appear at once, along with pounds, troy ounces and the kitchen-friendly rounded value.

The Formula

  ounces       = grams ÷ 28.349523125
  pounds       = ounces ÷ 16
  troy ounces  = grams ÷ 31.1034768

The everyday ounce, the avoirdupois ounce, is exactly one sixteenth of a pound, and the pound is exactly 453.59237 grams, so an ounce is exactly 28.349523125 grams.

Step-by-Step Example

100 grams to ounces.

  100 ÷ 28.349523125 = 3.5274 oz

So 100 g is 3.5274 ounces, about 3.5 oz for cooking. In troy ounces it is 3.21507.

500 grams is 500 ÷ 28.349523125 = 17.637 oz, which is 1 lb 1.6 oz — a little more than a pound.

Quick Reference

  10 g    = 0.35274 oz
  25 g    = 0.881849 oz
  50 g    = 1.7637 oz
  100 g   = 3.5274 oz
  125 g   = 4.40925 oz
  250 g   = 8.81849 oz
  454 g   ≈ 16 oz (1 lb)
  1,000 g = 35.274 oz

Cooking and Baking

American recipes list butter, chocolate, cheese and meat by the ounce, while metric kitchens weigh in grams. Many cooks use 28 g or 30 g as a working ounce; 30 g is easy to multiply but about 6 percent high, which can matter in baking. For precision, use the exact factor and round the result to a quarter ounce, as most kitchen scales show.

Remember that recipes also use fluid ounces, which measure volume, not weight. A US fluid ounce of water weighs about 29.6 g, close to an ounce, but a fluid ounce of flour weighs much less, and of honey much more.

Troy Ounces for Gold and Silver

Precious metals are priced in troy ounces of 31.1034768 grams, about 9.7 percent heavier than an everyday ounce. A 1-ounce gold coin contains one troy ounce of gold; a 100 g gold bar is 3.21507 troy ounces; and a kilogram bar is about 32.1507 troy ounces. If you use everyday ounces for gold by mistake, the value comes out almost 10 percent too high.

Postage and Shipping

US postage is priced by the ounce for letters and small parcels, while most other postal services use grams. A 100 g letter is 3.53 oz; a 1 kg parcel is 35.27 oz, or 2 lb 3.3 oz. Weight bands in both systems are strict, so round up when choosing postage.

Nutrition Labels

Food labels in many countries give nutrition per 100 g, while US labels use a serving size in ounces or grams. A serving of 28 g is about 1 oz, and a 150 g portion is about 5.3 oz. Converting both to the same unit makes it easy to compare products labelled in different countries, and to check that a portion you weigh at home matches the serving the label describes.

Small Weights: Spices, Coffee and Supplements

Very small amounts are where rounding errors show most. A teaspoon of salt weighs about 6 g, a fifth of an ounce, and a sachet of dried yeast 7 g, about a quarter ounce. Coffee brewing guides often call for 15 to 18 g of ground coffee per cup, a little over half an ounce. For these amounts, grams are far more precise than fractions of an ounce, so where a recipe allows, weigh small ingredients in grams on a scale that reads to 1 g or better, and convert only if you must.

Jewellery and Other Special Units

Jewellers weigh gemstones in carats of exactly 0.2 grams, so a 1-carat diamond is 200 milligrams, about 0.00705 ounces. Gold jewellery is often priced by the gram in shops, while bullion is quoted per troy ounce. Pharmacists historically used grains, where an avoirdupois ounce is 437.5 grains and a troy ounce 480 grains, a reminder of how many different ounces have existed.

Understanding Your Result

The headline is the weight in ounces.

The pounds line gives pounds, or pounds and ounces for 16 ounces or more.

The troy ounces line gives the weight for gold, silver and other precious metals.

The for cooking line rounds the ounces to the nearest quarter ounce.

When Should You Use This Calculator?

Use it for American recipes with metric scales.

Use it for postage, shipping and package sizes in ounces.

Use it for gold, silver and jewellery weights in troy ounces.

Use it for comparing nutrition labels and portion sizes.

Common Mistakes

Confusing ounces and fluid ounces. One measures weight, the other volume.

Using everyday ounces for gold. Precious metals use troy ounces of 31.1 g.

Rounding an ounce to 30 g for baking. It is about 6 percent high.

Reading 1.5 lb as 1 lb 5 oz. It is 1 lb 8 oz.

Forgetting there are 16 ounces in a pound. Not 10 or 12, so 20 oz is 1 lb 4 oz.

Converting a converted figure. Start from the original grams to avoid rounding twice.