Convert grams to ounces and back — for cooking, shipping, and precious metals.
Last reviewed: April 2026
Convert grams to ounces (and ounces to grams) instantly. Reference table from 1g to 1000g for cooking, shipping, and jewelry. This calculator runs entirely in your browser — your data stays private, and no account is required.
One ounce equals exactly 28.3495 grams, and one gram equals 0.03527 ounces. For quick mental math, divide grams by 28 for an approximate ounce value, or multiply ounces by 28 for grams.[1] There are two types of ounces: avoirdupois ounces (used for general weight, 28.35g) and troy ounces (used for precious metals, 31.10g) — a troy ounce is about 10% heavier.[2] In cooking, fluid ounces (volume) and weight ounces are different measurements that only coincide for water — a fluid ounce of honey weighs about 1.5 weight ounces due to its higher density.[3] Use the Weight Converter for additional weight unit conversions.
| Grams | Ounces | Grams | Ounces | Grams | Ounces |
|---|---|---|---|---|---|
| 1 | 0.04 | 50 | 1.76 | 250 | 8.82 |
| 5 | 0.18 | 75 | 2.65 | 300 | 10.58 |
| 10 | 0.35 | 100 | 3.53 | 400 | 14.11 |
| 15 | 0.53 | 125 | 4.41 | 454 | 16.01 (1 lb) |
| 25 | 0.88 | 150 | 5.29 | 500 | 17.64 |
| 28.35 | 1.00 | 200 | 7.05 | 1000 | 35.27 |
There are two different ounces in use. The avoirdupois ounce (28.35g) is used for everything in daily life — food, packages, body weight. The troy ounce (31.10g) is used exclusively for precious metals — gold, silver, platinum. When someone says gold is "$2,000 per ounce," they mean troy ounces. A troy ounce is 9.7% heavier than a regular ounce. The precious metals calculator uses troy ounces automatically.
A fluid ounce (fl oz) measures volume — 29.57 ml. A weight ounce (oz) measures mass — 28.35 grams. They are completely different units that happen to share a name. One fluid ounce of water weighs approximately one weight ounce (by coincidence, since the US fluid ounce was historically defined this way), but one fluid ounce of honey weighs about 1.4 weight ounces, and one fluid ounce of cooking oil weighs about 0.9 weight ounces. When a recipe says "6 oz of chocolate," it means weight ounces. When it says "6 fl oz of cream," it means volume.
| Grams | Ounces (oz) | Pounds + Ounces | Common Item |
|---|---|---|---|
| 28.35 | 1 oz | — | Slice of bread |
| 100 | 3.53 oz | — | Smartphone |
| 250 | 8.82 oz | — | Cup of flour |
| 454 | 16 oz | 1 lb | Standard butter block |
| 1,000 | 35.27 oz | 2 lb 3.3 oz | Liter of water |
The gram-to-ounce conversion — 1 ounce = 28.3495 grams — bridges the metric and imperial weight systems used in cooking, shipping, jewelry, pharmaceuticals, nutrition labeling, and countless other applications. While most of the world uses grams exclusively, the United States, Liberia, and Myanmar still use ounces for everyday weight measurements, making this conversion one of the most frequently needed in daily life.
1 gram = 0.03527 ounces. 1 ounce (avoirdupois) = 28.3495 grams. 1 pound = 16 ounces = 453.592 grams. 1 kilogram = 2.2046 pounds = 35.274 ounces. For quick mental math, the approximation "1 ounce ≈ 28 grams" works well for most everyday purposes. More precisely: 1 oz = 28.35 g, 4 oz = 113.4 g, 8 oz = 226.8 g (half a pound), and 16 oz = 453.6 g (one pound).
An important distinction exists between the two ounce systems still in use. Avoirdupois ounces (28.3495 g) are the standard ounces used for food, shipping, body weight, and general commerce. Troy ounces (31.1035 g) are used exclusively for precious metals — gold, silver, platinum, and palladium. A troy ounce is about 10% heavier than a standard ounce. When gold is quoted at "$2,300 per ounce," that refers to troy ounces. One troy pound equals 12 troy ounces (373.24 g), while one avoirdupois pound equals 16 avoirdupois ounces (453.59 g) — making a troy pound actually lighter than a standard pound despite the individual troy ounce being heavier. This confusing overlap is a historical artifact of separate medieval weight systems for precious metals and everyday goods.
Nutrition labels in the U.S. list serving sizes in both grams and ounces, but the gram measurements are more precise. A "1 oz serving" of chips is actually 28 grams — but the package might round to 28g when the FDA-defined serving is 28.35g. For cooking, gram measurements produce more consistent results than ounces because kitchen scales can measure grams to single-digit precision, while ounce measurements on most home scales resolve only to 1/8 oz (3.5g) increments. Professional baking recipes specify ingredients in grams for this reason — "120g flour" is far more reproducible than "4.2 ounces" measured on a consumer scale.
USPS First-Class Mail pricing is based on ounce increments: letters up to 1 oz start at one rate, with each additional ounce adding cost up to 3.5 oz (the First-Class letter limit). Packages use pounds and ounces up to 13 oz for First-Class packages, then shift to Priority Mail pricing. Knowing that a sheet of standard copy paper weighs about 4.5–5 grams (0.16–0.18 oz) helps estimate postage: a 10-page letter plus envelope weighs roughly 50–55 grams (about 1.8–1.9 oz), putting it in the 2-oz postage rate. International shipping universally uses grams and kilograms, so converting your package weight from ounces to grams is essential for customs declarations and international rate calculations.
Medications and supplements are almost universally measured in metric units (milligrams and grams), but consumers sometimes encounter ounce-based packaging — particularly for liquid medications and herbal products. One fluid ounce of liquid does not necessarily weigh one ounce — the weight depends on the liquid's density. A fluid ounce of water weighs approximately 29.57 grams (close to 1 avoirdupois ounce by coincidence), but a fluid ounce of honey weighs about 42 grams due to its higher density. For powdered supplements, dosing scoops are calibrated in grams — never substitute an ounce measurement for a gram measurement or vice versa without converting, as the 28:1 ratio means small errors multiply dangerously in pharmaceutical contexts.
Fine jewelry uses grams for base metals, troy ounces for precious metals, and carats (1 carat = 0.2 grams = 0.00705 ounces) for gemstones. A typical 18-karat gold wedding band weighs 4–8 grams. A 1-troy-ounce gold coin (like the American Gold Eagle) weighs 31.1 grams total but contains exactly 1 troy ounce (31.1 g) of pure gold — the total coin weight is actually 33.93 grams because the alloy includes copper and silver for durability. Understanding these distinctions prevents confusion when buying, selling, or insuring precious metals and jewelry.
Having a mental library of common weights helps calibrate your intuition. A U.S. nickel weighs exactly 5.0 grams (useful for calibrating a kitchen scale). A standard paperclip weighs about 1 gram. A AA battery weighs approximately 23 grams (0.81 oz). A medium apple weighs about 180 grams (6.3 oz). A smartphone typically weighs 150–230 grams (5.3–8.1 oz). A standard stick of butter weighs 113 grams (4 oz). A baseball weighs 142–149 grams (5.0–5.25 oz). A basketball weighs about 623 grams (22 oz). These everyday comparisons make abstract gram and ounce values tangible — when a recipe calls for 200 grams of chicken breast, you know that is roughly the weight of your smartphone, helping you estimate portions even without a scale available.
Use this converter for instant, precise gram-to-ounce and ounce-to-gram calculations across cooking, shipping, jewelry, and any other application requiring cross-system weight conversion.
See also: Recipe Scaler · Weight Converter · Volume Converter
→ 1 oz = 28.3495 grams. For quick math: divide grams by 28 (or multiply ounces by 28). 100g ≈ 3.5 oz. 200g ≈ 7 oz. 500g ≈ 17.6 oz (just over 1 lb).
→ Food labeling uses grams worldwide. Even in the US, nutrition labels show grams. A "serving" of protein is typically 20–30g. A tablespoon of butter is about 14g. Our Cups to Grams Converter handles cooking conversions.
→ Precious metals use troy ounces. 1 troy oz = 31.1035g (not 28.35g). Gold and silver are always priced per troy ounce. A "1 oz gold coin" weighs 31.1g, not 28.3g.
→ Postal weight thresholds. USPS letter rate changes at 1 oz (28g), then increases per additional ounce. Weighing envelopes in grams gives more precision than a postal scale that rounds to whole ounces.
See also: Weight Converter · Cups to Grams · Kg to Lbs · Lbs to Kg