Updated September 2026
Ounce to Gram
Instantly convert ounce to gram with fast, accurate, real-time results.
Contents
Converting ounces to grams is essential when using a metric kitchen scale with US recipes, checking nutrition labels, or calculating postal rates outside the US. This ounces to grams converter gives you the metric answer instantly. For the reverse, use our grams to ounces converter. To convert to kilograms, see ounces to kg.
The oz to g Formula
One avoirdupois ounce is defined as exactly 28.349523125 grams. This is the standard ounce used for food, body weight, and everyday goods — distinct from the troy ounce used for precious metals (31.1035 g).
Example: 6 oz × 28.3495 = 170.10 g
Common Cooking & Baking Conversions
US recipes use ounces; European, UK, and Australian recipes use grams. This chart covers the ounce amounts that appear most often in American recipes.
| Ounces | Grams | Common Recipe Use |
|---|---|---|
| ½ oz | 14.17 g | Small amounts of spice or yeast |
| 1 oz | 28.35 g | 1 tablespoon butter; 1 square chocolate |
| 1½ oz | 42.52 g | Single spirits measure (US jigger) |
| 2 oz | 56.70 g | Small cheese portion; 1/8 cup butter |
| 3 oz | 85.05 g | Standard deli meat serving; small steak |
| 4 oz (¼ lb) | 113.40 g | Single burger patty; stick of butter |
| 5 oz | 141.75 g | Chicken breast (small) |
| 6 oz | 170.10 g | Standard salmon fillet; tuna can |
| 7 oz | 198.45 g | Average chicken breast |
| 8 oz (½ lb) | 226.80 g | Block of cream cheese; 2 sticks butter |
| 10 oz | 283.50 g | Frozen spinach pack; medium steak |
| 12 oz (¾ lb) | 340.19 g | Standard beer can; bag of chocolate chips |
| 14 oz | 396.89 g | Standard can of coconut milk |
| 15 oz | 425.24 g | Standard US can (beans, tomatoes) |
| 16 oz (1 lb) | 453.59 g | Pound of pasta, ground beef, or butter |
US Package Sizes in Grams
US food products are labelled in ounces (and sometimes pounds). Here's how common US grocery packaging translates to metric:
| US Package | Ounces | Grams | Product Examples |
|---|---|---|---|
| 1 oz snack pack | 1 oz | 28.35 g | Single-serve chips, nuts, crackers |
| 3.5 oz bar | 3.5 oz | 99.22 g | Chocolate bar |
| 6 oz can | 6 oz | 170.10 g | Canned tuna (standard US size) |
| 8 oz block | 8 oz | 226.80 g | Cream cheese, shredded cheese block |
| 10.5 oz can | 10.5 oz | 297.67 g | Condensed soup (standard US size) |
| 12 oz can | 12 oz | 340.19 g | Beer, soda can; bag of chocolate chips |
| 14.5 oz can | 14.5 oz | 411.07 g | Diced tomatoes, broth |
| 15 oz can | 15 oz | 425.24 g | Beans, chickpeas, fruit |
| 16 oz (1 lb) | 16 oz | 453.59 g | Pasta, ground beef, butter |
| 18 oz jar | 18 oz | 510.29 g | Peanut butter, jam |
| 24 oz bottle | 24 oz | 680.39 g | Salsa, pasta sauce |
| 32 oz (2 lb) | 32 oz | 907.18 g | Yoghurt container, stock/broth |
Nutrition Label Guide
US nutrition labels list serving sizes in both household units and metric (grams). This is required by the FDA to help consumers compare products. Here's how to read the numbers:
| Label Says | Grams Equivalent | What it means |
|---|---|---|
| 1 oz (28 g) | 28.35 g | Common dry food serving (crackers, cereal) |
| 2 oz (56 g) | 56.70 g | Pasta dry weight per serving |
| 3 oz (85 g) | 85.05 g | Cooked meat serving |
| 1 fl oz (liquid) | ~29.57 g (water) | Fluid ounce ≠ weight ounce; density varies |
Postal & Shipping Weights
US postal rates are calculated in ounces for lightweight mail. Here's how letter and small package weights convert to grams for international senders:
| Ounces | Grams | USPS / Postal Context |
|---|---|---|
| 1 oz | 28.35 g | Standard 1 oz first-class letter rate |
| 2 oz | 56.70 g | Heavier envelope with additional pages |
| 3 oz | 85.05 g | Greeting card in padded envelope |
| 3.5 oz | 99.22 g | USPS large envelope (flat) minimum |
| 4 oz | 113.40 g | Small booklet or thick catalogue |
| 8 oz | 226.80 g | Small package; half-pound threshold |
| 13 oz | 368.54 g | USPS priority mail starts below this |
| 16 oz (1 lb) | 453.59 g | Parcel post threshold (1 lb) |
Full Conversion Table: 1–100 oz to g
| oz | g | oz | g | oz | g |
|---|---|---|---|---|---|
| 1 | 28.35 | 18 | 510.29 | 55 | 1559.2 |
| 2 | 56.70 | 19 | 538.64 | 60 | 1700.9 |
| 3 | 85.05 | 20 | 566.99 | 64 | 1814.4 |
| 4 | 113.40 | 21 | 595.35 | 70 | 1984.5 |
| 5 | 141.75 | 22 | 623.70 | 75 | 2126.2 |
| 6 | 170.10 | 23 | 652.05 | 80 | 2268.0 |
| 7 | 198.45 | 24 | 680.39 | 85 | 2409.7 |
| 8 | 226.80 | 25 | 708.74 | 90 | 2551.5 |
| 9 | 255.15 | 28 | 793.79 | 96 | 2721.6 |
| 10 | 283.50 | 30 | 850.49 | 100 | 2834.9 |
| 11 | 311.84 | 32 | 907.18 | — | — |
| 12 | 340.19 | 35 | 992.23 | — | — |
| 13 | 368.54 | 40 | 1133.98 | — | — |
| 14 | 396.89 | 45 | 1275.73 | — | — |
| 15 | 425.24 | 48 | 1360.78 | — | — |
| 16 | 453.59 | 50 | 1417.48 | — | — |
| 17 | 481.94 | 52 | 1474.17 | — | — |
Frequently Asked Questions
How many grams is 4 oz?
4 ounces equals 113.40 grams. This is also ¼ pound. Common items weighing 4 oz include a standard hamburger patty, one stick of butter, and a small chicken thigh. Formula: 4 × 28.3495 = 113.40 g.
How many grams is 8 oz?
8 ounces equals 226.80 grams. This is also ½ pound. Common 8 oz items: a block of cream cheese, a cup of water, two sticks of butter, or a medium chicken breast. Formula: 8 × 28.3495 = 226.80 g.
How many grams is 16 oz?
16 ounces equals 453.59 grams — this is exactly one pound. A pound of pasta, ground beef, or a block of butter are all 16 oz / 453 g packages. Formula: 16 × 28.3495 = 453.59 g.
Is 1 oz equal to 30 grams?
Not exactly. One ounce is 28.3495 grams, not 30. The "30 g = 1 oz" approximation overestimates by about 5.8%, which is too high for cooking or nutrition purposes. Use 28 g as a rough estimate, or 28.35 g for accuracy.
How many ounces are in 250 grams?
250 grams equals 8.818 ounces. This is just over half a pound (½ lb = 226.8 g). A 250 g block of butter, cheese, or mince is a very common EU package size. Formula: 250 ÷ 28.3495 = 8.818 oz.
What is the difference between an ounce and a troy ounce?
The avoirdupois ounce (28.3495 g) is used for food, everyday goods, and body weight. The troy ounce (31.1035 g) is used exclusively for precious metals like gold, silver, and platinum. The troy ounce is about 10% heavier than the common ounce. This converter uses avoirdupois ounces only.
Sources & References
- NIST – SI Units: Mass – defines the gram and ounce relationship
- FDA – Nutrition Facts Label – US serving size and labelling requirements
- USPS – Domestic Mail Manual – postal weight thresholds
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Creator
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