Ounces to Grams (oz to g) Converter
Use this ounces to grams converter to instantly convert oz to g with accurate results. Enter a weight in ounces, adjust decimal precision, and get the equivalent grams value immediately.
This converter uses the exact formula g = oz × 28.3495, giving you precise results for cooking, baking, recipe conversions, and comparing imperial and metric weights.
Formula used: g = oz × 28.3495
Need to convert grams to ounces? Try our Grams to Ounces Converter.
Ounces to Grams Formula
To convert ounces to grams, multiply the ounce value by 28.3495.
Formula: g = oz × 28.3495
For example, to convert 4 oz to grams: 4 × 28.3495 = 113.40 g.
The exact value of the avoirdupois ounce is 28.349523125 grams, set by the 1959 International Yard and Pound Agreement between the United States, United Kingdom, Canada, Australia, New Zealand, and South Africa. This agreement resolved historical inconsistencies between slightly different national definitions of the pound, giving the ounce-to-gram conversion its current exact value. The "28.3495" figure used in everyday converters rounds the last few decimal places for practicality — the introduced error is less than 0.0001%.
Avoirdupois vs Troy Ounce
The avoirdupois ounce (28.3495 g) is the standard unit for food, body weight, and general commerce. The troy ounce (31.1035 g) is used exclusively for precious metals — gold, silver, platinum, and palladium are all traded in troy ounces. This means 1 troy oz is about 10% heavier than 1 avoirdupois oz. When a jeweler or precious metals dealer mentions "ounces," they mean troy; when a recipe, food package, or postal scale mentions "ounces," they mean avoirdupois. This converter handles avoirdupois ounces only.
Common Ounce Weights in Grams
- 0.5 oz: 14.17 g (single-serve condiment packet)
- 1 oz: 28.35 g (a slice of bread, a shot of spirits)
- 2 oz: 56.70 g (a small snack bag of chips)
- 4 oz: 113.40 g (a quarter pound, a stick of butter)
- 8 oz: 226.80 g (half a pound, a block of cream cheese)
- 12 oz: 340.19 g (a standard can of soda/beer by weight)
- 16 oz: 453.59 g (1 pound)
- 1 troy oz: 31.10 g (precious metals unit — heavier than a standard oz)
Ounces to Grams Conversion Table
| Ounces (oz) | Grams (g) |
|---|---|
| 0.5 oz | 14.17 g |
| 1 oz | 28.35 g |
| 2 oz | 56.70 g |
| 4 oz | 113.40 g |
| 6 oz | 170.10 g |
| 8 oz | 226.80 g |
| 10 oz | 283.50 g |
| 12 oz | 340.19 g |
| 16 oz | 453.59 g (1 lb) |
| 32 oz | 907.18 g (2 lb) |
When to Convert Ounces to Grams
Adapting US recipes to a metric kitchen scale: American cookbooks and recipe websites list nearly all ingredient weights in ounces — "8 oz cream cheese," "6 oz dark chocolate," "3 oz almond flour." If your kitchen scale reads in grams (as most modern digital scales do outside the US, and many within it), you need to convert every ounce measurement before weighing. A recipe calling for 8 oz of butter requires measuring 226.80 g; 3 oz of chocolate means 85.05 g. Learning these conversions or using this tool eliminates the frustrating back-and-forth of switching your scale's unit mode mid-recipe, particularly for baked goods where ingredient ratios are critical to the outcome.
Understanding US food packaging weights in metric terms: Grocery items sold in the United States display net weights in both ounces and grams on the label, but the ounce number is typically larger and more prominent. Consumers shopping for specific gram quantities — for meal prep, portion control, or nutrition tracking — need to convert the ounce figure to verify they're buying the right amount. A can labeled "14.5 oz" contains 411.07 g; a "5 oz" yogurt container holds 141.75 g. These conversions help when comparing unit prices across differently sized packages, especially between US products and imported goods that list grams more prominently.
Precision baking and pastry work: Professional bakers and pastry chefs almost universally prefer weighing ingredients in grams over ounces because grams provide finer resolution — a scale showing grams can distinguish 113 g from 114 g, whereas the same scale in ounces shows only "4.00 oz" for both. When converting a US recipe to grams for precision baking, ounces-to-grams conversion is the first step. Converting 1.75 oz of yeast to 49.61 g, or 0.5 oz of salt to 14.17 g, allows precise measurement at the gram level rather than trying to measure fractional ounces that analog scales can't reliably read.
Scientific lab work and chemistry experiments: Lab protocols, chemistry reagent calculations, and analytical procedures written in the US or referencing older literature frequently specify masses in ounces. Any lab operating on SI units — which is essentially every modern scientific lab worldwide — needs to convert these specifications to grams before weighing reagents. A compound specified at "0.25 oz per liter" needs to be weighed as 7.09 g to prepare a standard solution. Educational labs working from American textbooks encounter this when translating experiment instructions written in customary units into the gram-based SI measurements that analytical balances are calibrated in.
FAQ
How do I convert ounces to grams?
Multiply ounces by 28.3495. Formula: g = oz × 28.3495. For a quick mental estimate, multiply by 28 (underestimates by about 1.24%). For example, 6 oz × 28 = 168 g (exact: 170.10 g). For baking and precision work, always use the full 28.3495 factor.
How many grams is 1 ounce?
1 avoirdupois ounce = 28.3495 grams exactly. Note that the troy ounce used for precious metals is slightly heavier at 31.1035 grams. All food, cooking, and general weight contexts use the avoirdupois ounce, so this converter's 28.3495 value is correct for virtually all everyday uses.
How many grams is 8 ounces?
8 ounces = 226.80 grams (exactly half a pound). This is a very commonly encountered measurement — cream cheese, butter, soft cheeses, and many deli items are sold in 8-oz packages in the United States. On a metric scale, 8 oz of any ingredient is just under 227 g.
How many grams is 16 ounces?
16 ounces = 453.59 grams = exactly 1 pound. This is the most fundamental ounce-to-grams reference: one pound of anything weighs 453.59 grams on a metric scale. Many US food products list their weight as "1 lb (453 g)" or "16 oz (454 g)" — the slight variation is just rounding at the last gram.
What is the difference between a fluid ounce and a weight ounce?
A fluid ounce measures volume — how much liquid a container holds. A weight ounce (avoirdupois) measures mass. They are not interchangeable except for water at standard conditions, where 1 US fluid ounce ≈ 29.57 g of water. For all other substances, a fluid ounce volume contains a different mass depending on the density of the liquid. This converter works with weight ounces only — use a volume converter for fluid ounces.