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Convert ounces to grams instantly with our free online calculator. Essential for cooking and baking recipes, food portion sizes, nutrition labels, postal mail, and jewelry measurements.
28.3495
Grams per Ounce
0.03527
Ounces per Gram
453.6 g
Grams per Pound (16 oz)
Formula: Grams = Ounces x 28.3495
| Ounces (oz) | Grams (g) | Context |
|---|---|---|
| 0.25 oz | 7.087 g | Small spice packet |
| 0.5 oz | 14.17 g | Half ounce, small portion |
| 1 oz | 28.35 g | Standard first-class letter (USPS) |
| 2 oz | 56.70 g | Small chocolate bar |
| 3 oz | 85.05 g | Standard protein serving |
| 4 oz | 113.4 g | Stick of butter |
| 5 oz | 141.7 g | Medium fruit (apple) |
| 6 oz | 170.1 g | Standard yogurt container |
| 8 oz | 226.8 g | One cup of flour (approx.) |
| 10 oz | 283.5 g | Large baking measurement |
| 12 oz | 340.2 g | Standard can of soda |
| 16 oz | 453.6 g | One pound |
| 24 oz | 680.4 g | Large loaf of bread |
| 32 oz | 907.2 g | Two pounds |
| 48 oz | 1,361 g | Three pounds |
An ounce (symbol: oz) is a unit of mass in the imperial and US customary measurement systems. The most common type is the avoirdupois ounce, equal to exactly 28.349523125 grams. The word derives from the Latin uncia, meaning "one-twelfth," originally referring to one-twelfth of a Roman pound. In the US, ounces are the standard unit for food packaging, cooking recipes, and postal weights. There are 16 ounces in one pound and 35.274 ounces in one kilogram.
A gram (symbol: g) is the base unit of mass in the metric system, defined as one-thousandth of a kilogram. Originally defined during the French Revolution as the mass of one cubic centimeter of water at its maximum density, the gram is now the global standard for precision measurements in cooking, science, medicine, and commerce. There are 1,000 grams in a kilogram and 1,000 milligrams in a gram, making the metric system straightforward for scaling calculations up or down.
The relationship between these units is fixed: 1 oz = 28.3495 grams, or conversely, 1 gram = 0.03527 ounces. It is important to distinguish the avoirdupois ounce (28.3495 g, used for food and general purposes) from the troy ounce (31.1035 g, used exclusively for precious metals). This converter uses the avoirdupois ounce, which is the standard for cooking, baking, nutrition labels, postal mail, and everyday weight measurements.
The formula to convert ounces to grams is: Grams = Ounces x 28.3495. Simply multiply the number of ounces by the conversion factor 28.3495 to get the equivalent weight in grams.
Question: A cookie recipe calls for 4 ounces of butter (one stick). How many grams is that?
Question: A nutrition plan recommends a 6-ounce chicken breast. What is that in grams for a metric scale?
Note: This is a common serving size used in meal-prep and fitness nutrition tracking.
Question: A standard first-class letter must weigh no more than 1 ounce for basic postage. What is that in grams?
For a quick estimate, multiply ounces by 28 (slightly less than the exact factor of 28.3495). This gives you a result within 1.2% accuracy. For example: 8 oz x 28 = 224 g (exact: 226.8 g). Another trick: multiply by 30 for a quick upper estimate. So 8 oz x 30 = 240 g. The true answer (226.8 g) falls between these two estimates, giving you a reliable range for mental calculations.
| Ingredient | Ounces | Grams |
|---|---|---|
| Butter (1 stick) | 4 oz | 113 g |
| Flour (1 cup, approx.) | 4.4 oz | 125 g |
| Granulated sugar (1 cup) | 7 oz | 198 g |
| Brown sugar, packed (1 cup) | 7.7 oz | 218 g |
| Chocolate chips (1 cup) | 6 oz | 170 g |
| Cream cheese (1 block) | 8 oz | 227 g |
| Powdered sugar (1 cup) | 4.2 oz | 120 g |
| Food Item | Ounces | Grams |
|---|---|---|
| Slice of bread | 1 oz | 28 g |
| Cheese serving | 1.5 oz | 43 g |
| Chicken breast | 6 oz | 170 g |
| Steak serving | 8 oz | 227 g |
| Salmon fillet | 5 oz | 142 g |
| Hamburger patty | 4 oz | 113 g |
| Pasta (dry, 1 serving) | 2 oz | 57 g |
| Metal / Item | Troy Ounces | Grams |
|---|---|---|
| Gold coin (1/10 oz) | 0.1 t oz | 3.11 g |
| Gold coin (1/4 oz) | 0.25 t oz | 7.78 g |
| Gold coin (1/2 oz) | 0.5 t oz | 15.55 g |
| Gold coin (1 oz) | 1 t oz | 31.10 g |
| Silver bar (5 oz) | 5 t oz | 155.5 g |
| Silver bar (10 oz) | 10 t oz | 311.0 g |
Note: Troy ounces (31.1035 g) are used for precious metals. Our calculator uses avoirdupois ounces (28.3495 g) for general weight conversions.
American recipes use ounces while most international and professional recipes use grams. Accurate conversion is critical for baking where precision affects texture, rise, and flavor. Using a digital scale in grams eliminates measurement inconsistencies from cups and tablespoons.
US nutrition labels show serving sizes in both ounces and grams. Understanding the conversion helps with calorie counting, macro tracking, and comparing products. International food databases predominantly list nutritional values per 100 grams, requiring conversion from US ounce-based servings.
USPS uses ounces for domestic postage rates (first-class letters, packages). International postal services use grams and kilograms. Converting between systems is essential when shipping internationally, comparing carrier rates, or estimating postage for letters and parcels.
The jewelry industry uses troy ounces (31.1035 g) for gold, silver, and platinum pricing. Understanding the difference between troy and avoirdupois ounces prevents costly mistakes. Gemstones use carats (1 carat = 0.2 g), adding another layer of weight conversion in the jewelry trade.
Multiplying by 28 gives accuracy within 1.2% -- plenty for everyday cooking. Use the full factor for scientific, postal, or commercial applications.
These two benchmarks help sanity-check your results. If your gram number is not roughly 28 times your ounce number, re-check your calculation.
Weighing ingredients in grams is more accurate than measuring by volume. A good digital scale with 1-gram precision costs under $15 and transforms baking consistency.
Fluid ounces measure volume; ounces measure weight. 8 fluid ounces of honey weighs about 12 ounces (340 g) due to its high density.
Gold, silver, and platinum use troy ounces (31.1035 g), which are about 10% heavier than regular ounces (28.3495 g). Mixing these up causes significant pricing errors.
Ounces to grams requires multiplication by 28.3495. Dividing by 28.3495 gives grams to ounces -- the wrong direction. The gram result should always be larger than the ounce input.
One avoirdupois ounce equals exactly 28.3495 grams. For quick mental math, rounding to 28 grams gives a result within 1.2% accuracy. This is the standard ounce used in cooking, baking, food labels, and everyday measurements in the United States.
Multiply the number of ounces by 28.3495. For example, 4 oz x 28.3495 = 113.398 grams. For a quick estimate, multiply by 28 or 30. Use 28 for a slight underestimate or 30 for a slight overestimate.
A regular (avoirdupois) ounce equals 28.3495 grams, used for food, cooking, and general weight. A troy ounce equals 31.1035 grams, used exclusively for precious metals like gold, silver, and platinum. The troy ounce is about 10% heavier than a regular ounce.
Grams provide finer precision because they are a smaller unit. Baking is chemistry-dependent, and differences of even 5 grams can affect texture and rise. Grams also make scaling recipes easier (doubling 150g is simply 300g) and eliminate inconsistencies from scooping and packing that plague volume measurements.
Fluid ounces measure volume (liquid capacity), while ounces measure mass (weight). They share the same name but measure different physical properties. One fluid ounce of water weighs approximately one ounce, but this relationship does not hold for other substances due to varying densities. Always use weight ounces for solid ingredients and fluid ounces for liquids.
Multiply ounces by 28.3495. Common baking conversions: 4 oz butter (1 stick) = 113 g, 8 oz flour (about 1 cup) = 227 g, 7 oz sugar (1 cup) = 198 g. For best results, use a digital kitchen scale set to grams for precise ingredient measurements.
100 grams equals approximately 3.5274 ounces. This is a common reference point on nutrition labels and in international recipes. To convert grams to ounces, divide by 28.3495.
Not exactly. One ounce equals 28.3495 grams precisely. The rounded figure of 28 grams is about 1.2% less than a true ounce. For cooking, 28 grams is close enough. For postal rates, precious metals, or scientific work, use the full precision of 28.3495 grams.
USPS uses ounces for domestic letter weight (1 oz first-class limit for a standard stamp). International mail uses grams. A standard letter weighing 1 oz equals about 28 g. Priority Mail and international services often list weight limits in both systems. Always round up to the next ounce when calculating postage.
One pound (16 ounces) equals 453.592 grams. This is a useful reference when working with larger quantities. For example, a 5-pound bag of flour is about 2,268 grams or 2.268 kilograms.
This calculator uses the internationally recognized conversion factor of 1 ounce = 28.3495 grams (avoirdupois). For precious metals, use the troy ounce (31.1035 g) instead. For legal, scientific, or commercial applications, always verify conversions with calibrated equipment and refer to your industry's official measurement standards.