Oz to Grams Converter

Why Ounces and Grams Both Matter

Two measurement systems dominate the world's kitchens, nutrition labels, and product packaging: the metric system (grams, kilograms) used by most of the world, and the US customary system (ounces, pounds) standard in the United States. Understanding how to convert between them is an everyday skill for cooks, fitness enthusiasts, and anyone reading a food label.

The United States, Myanmar, and Liberia are the only three countries that still use avoirdupois ounces as a primary unit of mass for everyday commerce. Everywhere else — and in scientific contexts everywhere — the gram and kilogram reign. This means that US recipes regularly call for "1 oz of dark chocolate" or "4 oz of chicken breast," while European and Australian recipes will say "30 g" and "120 g" for the same amounts.

Ounces to Grams: The Formula

Converting oz to g is simple multiplication:

• Grams = Ounces × 28.3495
• Example: 3 oz × 28.3495 = 85.05 g
• Example: 12 oz × 28.3495 = 340.19 g

For a quick mental estimate without a calculator, multiply oz by 28 and add about 2.5% for a close-enough result. Or simply remember a few anchor values: 1 oz ≈ 28 g, 4 oz ≈ 113 g, 8 oz ≈ 227 g, 1 lb (16 oz) ≈ 454 g.

Grams to Ounces: Converting in Reverse

To go the other direction:

• Ounces = Grams ÷ 28.3495 (or equivalently, Grams × 0.03527)
• Example: 200 g ÷ 28.3495 = 7.05 oz
• Example: 500 g ÷ 28.3495 = 17.64 oz

A useful shortcut: divide grams by 28 for a fast estimate that's accurate to within about 1.3%.

Ounces and Grams in Cooking

Cooking and baking are where oz-to-gram conversions come up most often. American recipes use cups, tablespoons, and ounces. Most international recipes and professional baking formulas use grams. A kitchen scale that displays both units makes switching trivial, but when you don't have one handy, this converter fills the gap.

Why Bakers Prefer Grams

Professional bakers almost universally prefer weighing ingredients in grams over measuring by volume. The reason is accuracy: a "cup of flour" can range from 100 g (lightly spooned) to 160 g (scooped and packed), a 60% variation that drastically affects the final product. When you weigh 120 g of flour, you always get 120 g — regardless of how it's settled, how humid the kitchen is, or how coarsely the flour was milled.

Converting older American recipes to grams is therefore an upgrade in precision. A recipe that calls for "4 oz (113 g) of butter" is already giving you both — the oz for US shoppers and grams for everyone else.

Nutrition Labels: Grams Are the Standard

In the United States, the Nutrition Facts panel on packaged foods lists serving sizes in both household measures AND metric (grams or mL). The gram figure is the legally precise one; the cup or tablespoon is a convenient approximation. When you're counting macros or calories, always use the gram figure for accuracy.

For example, a label may say "Serving size: 1 oz (28g)." Because the density of the food matters, 1 fluid ounce of peanut butter weighs differently from 1 fluid ounce of olive oil. The gram weight is always exact; the ounce figure rounds to the nearest ounce.

Gold, Silver, and Precious Metals: The Troy Ounce

If you're researching gold or silver prices, be aware that precious metals use a different ounce — the troy ounce. The troy ounce is heavier than the avoirdupois ounce:

• 1 troy ounce = 31.1035 grams
• 1 avoirdupois ounce = 28.3495 grams
• Difference: ~9.7% heavier

When gold is quoted at "$2,300 per oz," that's per troy ounce. A "1 oz gold coin" weighs 31.1 g, not 28.35 g. The troy ounce has been used in precious metals trading since the Middle Ages and remains the global standard for gold, silver, platinum, and palladium pricing.

For everything else — food, medicine, body weight, shipping — the regular avoirdupois ounce (28.3495 g) applies.

Pounds to Grams and Kilograms

Since 1 pound = 16 ounces, and 1 ounce = 28.3495 g:

• 1 lb = 453.592 g ≈ 0.4536 kg
• 2 lb = 907.18 g ≈ 0.907 kg
• 5 lb = 2,267.96 g ≈ 2.268 kg
• 10 lb = 4,535.92 g ≈ 4.536 kg

A quick mental shortcut: 1 pound ≈ 450 g, or roughly half a kilogram. This is accurate to within 1% and useful for grocery shopping when you need a fast estimate.

Common Conversions You'll Actually Use

Here are the most frequently needed oz-to-gram conversions in American cooking, baking, and food prep:

• 1 oz = 28.35 g — one slice of cheese, one serving of nuts, a small piece of chocolate
• 3.5 oz = 100 g — the "100 g" nutrition label reference size
• 4 oz = 113.4 g — quarter pound of ground beef, a single chicken tender
• 8 oz = 226.8 g — standard block of cream cheese, cup of water
• 12 oz = 340.2 g — standard can of soda, most beer cans
• 16 oz = 453.6 g — one pound, large yogurt container
• 32 oz = 907.2 g — two pounds, large family-size tub