Convert ounces to grams using the exact factor of 28.349523125 grams per ounce, with a clear formula, worked example, and common conversion values and results.
Converted value = Source value × Conversion factor
For affine conversions such as temperature, an offset is also applied.The tool applies the relevant factor or temperature offset to the source value. Currency outputs require a current exchange-rate source, while cooking volume-to-weight conversions can vary by ingredient density and measuring method.
Use the Ounces to Grams Calculator to convert mass from ounces (oz) to grams (g). One avoirdupois ounce equals exactly 28.349523125 grams. Enter the number of ounces and multiply it by 28.349523125 to calculate the equivalent mass in grams.
To convert ounces to grams, multiply the ounce value by 28.349523125. This conversion applies to the avoirdupois ounce, the standard ounce used for measuring food, packages, ingredients, and other everyday items in the United States.
Conversion factor: 1 oz = exactly 28.349523125 g
The exact formula for converting ounces to grams is:
Grams = Ounces × 28.349523125
For most everyday calculations, the conversion factor can be rounded to 28.35:
Grams ≈ Ounces × 28.35
The exact factor is preferable for scientific, technical, shipping, or nutrition calculations. The rounded factor is generally sufficient for cooking and quick estimates.
Convert 5 ounces to grams:
Starting value: 5 oz
Calculation: 5 × 28.349523125 = 141.747615625
Final value: 5 oz = 141.748 g when rounded to three decimal places.
| Ounces (oz) | Grams (g) |
|---|---|
| 0.1 oz | 2.835 g |
| 0.25 oz | 7.087 g |
| 0.5 oz | 14.175 g |
| 1 oz | 28.350 g |
| 2 oz | 56.699 g |
| 3 oz | 85.049 g |
| 4 oz | 113.398 g |
| 5 oz | 141.748 g |
| 6 oz | 170.097 g |
| 8 oz | 226.796 g |
| 10 oz | 283.495 g |
| 12 oz | 340.194 g |
| 16 oz | 453.592 g |
| 20 oz | 566.990 g |
| 24 oz | 680.389 g |
| 32 oz | 907.185 g |
| 40 oz | 1,133.981 g |
| 48 oz | 1,360.777 g |
| 64 oz | 1,814.369 g |
| 100 oz | 2,834.952 g |
Sixteen ounces equal 453.59237 grams because 16 avoirdupois ounces make one pound. This is also why one pound equals exactly 453.59237 grams.
An ounce is a unit of mass in the United States customary and British imperial measurement systems. Its standard symbol is oz. The avoirdupois ounce is commonly used for food, packaged goods, postal items, and other everyday measurements.
A mass ounce should not be confused with a fluid ounce, which measures volume. Converting fluid ounces to grams requires the substance’s density, so there is no universal fluid-ounce-to-gram conversion factor.
A gram is a metric unit of mass with the symbol g. It is part of the International System of Units through the kilogram, the SI base unit of mass. One gram equals 0.001 kilograms, and 1,000 grams equal 1 kilogram.
Grams are widely used internationally for food ingredients, product weights, laboratory measurements, nutrition labels, and small packages.
One avoirdupois ounce equals exactly 28.349523125 grams. For everyday use, this is commonly rounded to 28.35 grams.
Multiply the mass in ounces by 28.349523125. For example, 3 oz × 28.349523125 = 85.048569375 g, or approximately 85.049 g.
Eight ounces equal 226.796185 grams, usually displayed as 226.796 g or 226.8 g.
Sixteen ounces equal 453.59237 grams. Sixteen ounces also equal one avoirdupois pound.
Rounding depends on the intended use. Two decimal places are usually adequate for cooking, while scientific or technical work may require additional decimal places. Avoid reporting more precision than the original measurement supports.
Divide the gram value by 28.349523125. The reverse formula is Ounces = Grams ÷ 28.349523125.
Enter a known source value, confirm the direction of conversion and compare the result with the level of precision required. Keep extra decimal places for technical work and round only at the final step.
For a fast estimate, multiply the number of ounces by 28.35. This rounded factor is suitable for most cooking, shopping, and everyday weight conversions.
Estimated conversion: Grams ≈ Ounces × 28.35
For calculations requiring greater precision, use the exact factor:
Precise conversion: Grams = Ounces × 28.349523125
The converted result should not imply greater accuracy than the original measurement. If the ounce value is approximate, the gram result should also be treated as approximate.
American recipes often list ingredient weights in ounces, while international recipes commonly use grams. Converting weight measurements can improve consistency, especially for flour, sugar, butter, chocolate, meat, and other ingredients measured by mass.
Confirm that the recipe uses weight ounces rather than fluid ounces. A kitchen scale measures mass and can display ounces or grams directly.
An ounce identified by oz measures mass. A fluid ounce identified by fl oz measures volume. These units are not interchangeable.
Converting fluid ounces to grams requires the density of the specific ingredient or liquid. For example, the same volume of water, milk, oil, and honey will have different masses in grams.
The standard ounces-to-grams conversion uses the avoirdupois ounce, which is common for food, parcels, household products, and general-purpose measurements.
Troy ounces are primarily used for precious metals such as gold, silver, platinum, and palladium. Confirm the ounce type before converting valuable metals or specialized materials.
If a weight contains pounds and ounces, first convert the pounds to ounces. One pound contains 16 ounces. Add the remaining ounces, then multiply the total by 28.349523125.
Total ounces = (Pounds × 16) + Remaining ounces
Grams = Total ounces × 28.349523125
For example, convert 2 pounds 4 ounces to grams:
Result: 2 lb 4 oz equals approximately 1,020.583 grams.