Ounce to Gram Calculator — Free oz to g Converter
Convert ounces to grams in seconds with our free online calculator. Built for American kitchens: recipes, baking, meal prep, and nutrition labels. Enter any oz value and get exact gram results instantly.
US Weight Converter CalculatorThe quick answer for 1 Ounces — type any value below for the exact result
Ounces
Grams
oz to g Conversion Formula
To convert ounces to grams, multiply the ounce value by 28.3495. This factor comes from the international avoirdupois ounce, which is defined as exactly 28.349523125 grams.
Ounces and Grams Explained
Ounces (oz)
An ounce (oz) is the fine-weight unit of the US customary and imperial systems, defined as exactly 28.349523125 g — roughly the weight of a slice of bread or five US quarters. Sixteen ounces make one pound, so the ounce covers the space where pounds are too coarse: sandwich slices at a New York deli, espresso doses, trail mix servings, and first-class letters all live between a fraction of an ounce and about 16 oz.
Where it is used: Ounces dominate packaged-food labels, USPS postal rates, and kitchen recipes in the United States, and they still appear alongside grams on Canadian and British packaging.
Origin: The ounce descends from the Roman uncia, one twelfth of a libra. The avoirdupois ounce was fixed internationally in 1959 at exactly 28.349523125 grams.
Grams (g)
A gram (g) is the base building block of metric mass, equal to one thousandth of a kilogram. It sits on the scale of everyday precision: a paperclip weighs about 1 g, a raisin 0.5 g, and a standard Hershey's bar about 43 g. Nutrition panels, pharmacy balances, and spice measures quote grams directly, and because the metric system moves in tens, converting grams to kilograms or milligrams is just a decimal shift.
Where it is used: Grams are the universal unit for kitchen scales, FDA nutrition panels, laboratory work, and retail packaging in every metric country — that is, nearly the entire world outside the United States.
Origin: The gram was defined in 1795 as the mass of one cubic centimeter of melting ice water, one of the two founding units of the metric system alongside the meter.
Ounces to Grams Conversion Table
| Ounces (oz) | Grams (g) |
|---|---|
| 0.25 oz | 7.087375 g |
| 0.5 oz | 14.17475 g |
| 1 oz | 28.3495 g |
| 1.5 oz | 42.52425 g |
| 2 oz | 56.699 g |
| 3 oz | 85.0485 g |
| 4 oz | 113.398 g |
| 5 oz | 141.7475 g |
| 6 oz | 170.097 g |
| 8 oz | 226.796 g |
| 10 oz | 283.495 g |
| 12 oz | 340.194 g |
| 14 oz | 396.893 g |
| 16 oz | 453.592 g |
| 18 oz | 510.291 g |
| 20 oz | 566.99 g |
| 24 oz | 680.388 g |
| 28 oz | 793.786 g |
| 32 oz | 907.184 g |
Grams to Ounces Conversion Table
| Grams (g) | Ounces (oz) |
|---|---|
| 5 g | 0.1763699536 oz |
| 10 g | 0.3527399072 oz |
| 20 g | 0.7054798145 oz |
| 30 g | 1.0582197217 oz |
| 50 g | 1.7636995361 oz |
| 75 g | 2.6455493042 oz |
| 100 g | 3.5273990723 oz |
| 125 g | 4.4092488404 oz |
| 150 g | 5.2910986084 oz |
| 200 g | 7.0547981446 oz |
| 250 g | 8.8184976807 oz |
| 300 g | 10.5821972169 oz |
| 400 g | 14.1095962892 oz |
| 500 g | 17.6369953615 oz |
Ounces to Grams in Everyday Objects
Common real-world examples that make Ounces and Grams easy to picture at a glance.
| Ounces (oz) | Grams (g) | |
|---|---|---|
| A slice of sandwich bread | 1 oz | 28.3495 g |
| A large strawberry | 0.5 oz | 14.17475 g |
| A slice of American cheese | 1.5 oz | 42.52425 g |
| A stick of butter | 4 oz | 113.398 g |
| A can of tuna | 5 oz | 141.7475 g |
| A deck of playing cards | 3.5 oz | 99.22325 g |
When You Need Ounces to Grams Conversions
Ordering at the Deli Counter
From Katz's in New York to your neighborhood market, deli clerks slice to the ounce, but imported prosciutto in the specialty case is priced per 100 grams. Knowing 4 oz of roast beef is 113.398 g lets you compare counter and shelf prices without guesswork.
Baking Classic American Recipes on a Gram Scale
Toll House-style cookie recipes list chips and nuts in ounces while your digital scale reads grams. Converting 6 oz of chopped chocolate to 170.097 g keeps your cocoa-to-flour ratio exact — the difference between chewy and cakey.
Reading FDA Nutrition Labels
US labels print serving sizes in ounces while vitamins and minerals list in milligrams. A 1 oz serving of almonds is 28.35 g, so converting helps you compare protein and sodium per gram across brands at the grocery store.
Blending Loose-Leaf Tea
Tea shops in Seattle and Brooklyn sell leaf by the ounce while blend formulas are recorded in grams. A 2 oz pouch of earl grey converts to 56.699 g, keeping your home blends consistent batch to batch.
Related Weight Conversions
How to Use
-
1
Enter Your Weight in Ounces
Type the ounce value — for example, enter 6 for a 6 oz can of tomato paste or a 6 oz chicken breast
-
2
See the Gram Equivalent
The result appears instantly: 6 oz = 170.097 g, ready for your digital kitchen scale
-
3
Copy or Reverse
Copy the result or click Swap to convert grams back to ounces
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4
Check the Table
Browse the conversion table for everyday values like a 4 oz stick of butter (113.398 g) or a 12 oz soda can (340.194 g)
Why Use Be Converter?
Instant Conversion
Get precise ounce to gram results in real-time as you type — type 8 oz and see 226.796 g before your oven finishes preheating to 350°F
Baking-Grade Precision
Uses the exact avoirdupois standard of 1 oz = 28.3495 g, so a 16 oz pack of ground beef reads exactly 453.592 g on your digital scale
Kitchen Reference Table
Common grocery and recipe weights at a glance — from a 1 oz square of baking chocolate (28.35 g) to a 32 oz Costco bulk bag (907.2 g)
Swap with One Click
Toggle between oz and g instantly — perfect when a US recipe lists ounces but your imported scale reads grams
Free & Unlimited
No registration required. Convert as many weights as you need, from a 0.5 oz spice packet to a 40 oz Sam's Club bulk bag — always free
Completely Private
All calculations run locally in your browser. Your ingredient and portion data never leaves your device
Frequently Asked Questions
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About Ounces to Grams Converter
Our free online ounces to grams converter delivers instant, accurate weight conversions for the American kitchen, the grocery aisle, and the classroom. Whether you're converting Grandma's handwritten recipe card written in ounces for your digital gram scale, portioning weekly meal prep containers, decoding an FDA nutrition label, or weighing a package for USPS shipping, this tool gives you reliable results every time. The ounce belongs to the US customary system, where 16 ounces make a pound, while the gram anchors the metric system used virtually everywhere else. Our converter applies the exact international avoirdupois standard of 1 oz = 28.3495 g.
Expert Tips for oz to g Conversion
Memorize four anchors and interpolate the rest: 1 oz = 28.35 g, 4 oz = 113.4 g, 8 oz = 226.8 g, and 16 oz = 453.592 g. Most recipe amounts fall between them.
Butter packaging differs by market: a US stick is 4 oz (113.398 g), while European-style imports like Kerrygold blocks run 250 g (8.82 oz). Converting before substituting prevents greasy or dry bakes.
Steakhouse menus list portions in ounces — 3 oz = 85 g, 6 oz = 170.1 g, 8 oz = 226.8 g. If a recipe calls for about 170 g of protein, that's the standard 6 oz fillet at your local grocery counter.
Newborn weights in US hospitals mix pounds and ounces while medical charts use grams — the 8 oz in a 7 lb 8 oz baby is 226.796 g, and the full 7.5 lb works out to the 3.402 kg on the wristband.
USPS First-Class rates step up by the ounce, not the gram. A letter weighing 1.5 oz is 42.5 g, and knowing the 28.3495 factor tells you exactly when your envelope crosses into the next price bracket.