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Accurate weight conversion between ounces (oz) and grams (g)
Convert ounces to grams instantly using precise imperial-to-metric conversion factors. Supports bidirectional oz ↔ g conversion with full breakdown into pounds and kilograms.
Professional weight conversion for cooking, shipping, nutrition, and science
Convert ounces to grams using the exact international avoirdupois relationship: 1 ounce (oz) = 28.349523125 grams (g). The tool also supports reverse conversion, converting grams back into ounces with full precision for 2026.
Switch seamlessly between ounces → grams and grams → ounces conversion modes. Results include a complete breakdown into pounds and kilograms, giving you a full view of the weight in both imperial and metric systems.
Ideal for recipe conversion, parcel weight checks, supplement dosing, jewelry and precious metals, and laboratory measurements. Whether you are baking, shipping internationally, or doing science homework, this converter keeps your numbers consistent.
Select conversion direction and enter your weight value below
The ounce is an imperial unit of mass used mainly in the United States and the UK for food, parcels, and small items, while the gram is the standard metric unit of mass. In the modern international avoirdupois system, 1 ounce (oz) is defined as exactly 28.349523125 grams (g). This fixed relationship allows seamless conversion between imperial and metric weight measurements.
A full pound (lb) contains 16 ounces, and one pound equals exactly 453.59237 grams. Because 453.59237 ÷ 16 = 28.349523125, the ounce-to-gram factor is exact and does not change over time. This makes ounce–gram conversion reliable for recipes, nutrition labels, postal tariffs, and trade wherever imperial and metric units meet.
Example: 8 oz × 28.349523125 = 226.796 g (≈ 227 g for most recipes)
1 oz = 28.3495 g = 0.0625 lb = 0.02835 kg
To convert ounces to grams manually, multiply the ounce value by 28.349523125. For most cooking and everyday use, rounding the factor to 28.35 is accurate enough. Here are three worked examples:
Formula: g = oz × 28.349523125
Calculation: 1 × 28.349523125
Result: 28.35 g (rounded)
Formula: g = oz × 28.349523125
Calculation: 8 × 28.349523125
Result: 226.796 g (≈ 227 g in recipes)
Formula: g = oz × 28.349523125
Calculation: 16 × 28.349523125
Result: 453.592 g (exactly 1 lb)
For fast estimates, remember: 1 oz ≈ 28 g, 4 oz ≈ 113 g (about 0.25 kg), 8 oz ≈ 227 g (about 0.5 lb), and 16 oz = 454 g (1 lb). For parcels and groceries, rounding to the nearest gram is usually fine; for lab work, always use the exact factor.
Use this reference table to quickly convert common ounce values to grams, pounds, and kilograms. On desktop you see all data; on mobile, use the grouped cards below.
| Ounces (oz) | Grams (g) | Pounds (lb) | Kilograms (kg) | Typical Use |
|---|---|---|---|---|
| 0.5 oz | 14.17 g | 0.0313 lb | 0.0142 kg | Small spice amount |
| 1 oz | 28.35 g | 0.0625 lb | 0.0283 kg | Chocolate square, small snack |
| 2 oz | 56.70 g | 0.1250 lb | 0.0567 kg | Single serving of meat or cheese |
| 3 oz | 85.05 g | 0.1875 lb | 0.0851 kg | Standard cooked meat portion |
| 4 oz | 113.40 g | 0.25 lb | 0.1134 kg | Quarter-pound burger patty |
| 6 oz | 170.10 g | 0.375 lb | 0.1701 kg | Medium steak or fish fillet |
| 8 oz | 226.80 g | 0.5 lb | 0.2268 kg | Half-pound block of butter |
| 10 oz | 283.50 g | 0.625 lb | 0.2835 kg | Large steak or packaged meal |
| 12 oz | 340.19 g | 0.75 lb | 0.3402 kg | Standard bag of coffee beans |
| 16 oz | 453.59 g | 1.0 lb | 0.4536 kg | 1 pound of flour or sugar |
| 24 oz | 680.39 g | 1.5 lb | 0.6804 kg | Large meat pack |
| 32 oz | 907.18 g | 2.0 lb | 0.9072 kg | 2-pound family pack |
| 64 oz | 1,814.37 g | 4.0 lb | 1.8144 kg | Large bulk package |
Converting between ounces and grams is a daily requirement in kitchens, warehouses, laboratories, and online marketplaces. This converter keeps imperial and metric weights aligned in every context.
Many US recipes list ingredients in ounces, while kitchen scales in metric countries show only grams. Converting oz to g accurately ensures proper ratios for flour, sugar, butter, and liquids, preventing dense cakes or failed bread due to incorrect weights.
Postal services and couriers around the world use both ounces and grams for weight brackets. Online sellers must convert product and packaging weights between oz, g, lb, and kg to calculate shipping costs and show accurate data on international marketplaces.
Nutrition labels may show serving sizes in grams, while diet plans and guides often refer to ounces. Converting between oz and g lets you track macros, calories, and serving sizes precisely — especially when using food scales that display only one system.
Jewelry and precious metals are often measured in grams, carats, or troy ounces, depending on the market. When comparing offers or valuing items, converting between regular ounces, troy ounces, and grams helps avoid confusion and pricing mistakes.
While science prefers metric units, educational materials and older lab manuals may still use ounces and pounds. Students and technicians convert oz to g to keep calculations, graphs, and lab reports in standard SI units while still understanding imperial references.
Protein powders, creatine, and other supplements frequently quote serving sizes in both grams and ounces. Accurate conversion helps athletes and gym-goers maintain consistent dosing when their scoop or measuring tools are calibrated in only one system.
Common benchmarks: 3 oz ≈ 85 g (standard cooked meat portion), 4 oz ≈ 113 g (quarter pound), 5 oz ≈ 142 g (typical salmon fillet), and 8 oz ≈ 227 g (half-pound portion). These rules of thumb make it easy to eyeball serving sizes when you don’t have a scale.
This converter uses the common avoirdupois ounce (28.3495 g) used for food and general weight. The troy ounce, used for gold and silver, equals approximately 31.1035 g. Always check which ounce type your source uses when working with precious metals or commodities.
International standards bodies define the exact relationships between ounces, pounds, and grams, ensuring that weight conversions remain stable worldwide for trade, shipping, and nutrition labelling.
Learn More →Professional baking resources explain why weighing ingredients in grams leads to more consistent results than using cups and spoons, and how to convert legacy ounce-based recipes into accurate metric versions.
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