Ounces to Grams Converter
A craft cocktail bartender in Brooklyn measuring out a half-ounce pour of orange bitters reaches for a precision jigger marked in milliliters because the modifier needs to land within a tenth of an ounce. The bottle label lists 8 fl oz on one side and 237 ml on the other; the ingredient mass on the back panel reads 14 g per 0.5 oz pour. Ounces-to-grams runs the other direction from the precision-roastery flow — here the American measurement comes first and the metric translation lands as the technical standard. Boxing weigh-ins reported as 154 lb 12 oz convert to a kilogram-and-gram precision the federation scale will display. Postal weights for international packages translate from the kitchen scale to the customs-form gram declaration. Cosmetics, perfumery, and supplement dosing all live in this conversion direction because the labeling regulation requires the metric figure even when the consumer thinks in ounces.
Calculator
1 × 28.349523125 = 28.3495
Formula
Multiply ounces by 28.349523125 to get grams — that exact factor comes from the 1959 international yard-and-pound agreement which defines the avoirdupois pound as 0.45359237 kg, with one ounce being one-sixteenth of that. For mental math the round 28.35 g per oz is good enough across nearly every kitchen application. Bartenders working in fractions of an ounce develop a feel that a quarter-ounce pour is just over 7 grams, a half-ounce is 14, and a full ounce is 28 — which lines up neatly with the 28-gram increment that herbal pharmacology has independently used for centuries.
Where You'll Use This
Mixology and cocktail recipes drive a surprising volume of ounce-to-gram conversions because high-end bar programs publish recipes in dual units to support international staff training. A standard 1.5 oz shot translates to 42.5 grams of mass for ingredient costing purposes, and a quarter-ounce dash of bitters lands at 7 grams on the back-of-house ingredient sheet. Postal and parcel-shipping forms require gram-level accuracy on customs declarations even when the sender weighed the package on an American kitchen scale in ounces. International cosmetics and skincare labeling — particularly serums and oils sold in 0.5 oz, 1 oz, and 2 oz dropper bottles — requires the gram equivalents to appear on the secondary packaging for European Union compliance. Hand-loaded ammunition recipes use grain weights for powder charges but bullet weights frequently appear in both ounces and grams in international ballistics tables, so a converter handles the cross-reference. Even artisanal cheesemakers buying culture starter packets sized in tenths of a gram have to translate from the ounce specs of older American cheese-making books.
Reference Table
| From (Ounces) | To (Grams) |
|---|---|
| 0.25 | 7.0874 |
| 0.5 | 14.1748 |
| 1 | 28.3495 |
| 1.5 | 42.5243 |
| 2 | 56.6991 |
| 3 | 85.0486 |
| 4 | 113.3981 |
| 5 | 141.7476 |
| 6 | 170.0971 |
| 7 | 198.4467 |
| 8 | 226.7962 |
| 10 | 283.4952 |
| 12 | 340.1943 |
| 14 | 396.8933 |
| 16 | 453.5924 |
| 20 | 566.9905 |
| 24 | 680.3886 |
| 32 | 907.1847 |
| 48 | 1360.7771 |
| 64 | 1814.3695 |
| 80 | 2267.9618 |
| 100 | 2834.9523 |
| 128 | 3628.739 |
| 160 | 4535.9237 |
| 200 | 5669.9046 |
A Bit of History
The avoirdupois ounce was defined in medieval England as the sixteenth part of the pound that wool merchants used in bulk trade, distinct from the troy ounce that goldsmiths and apothecaries preferred. By the 1593 statute era it had stabilized as roughly 28 grams under the modern metric measure, but the precise 28.349523125 figure only locked in with the 1959 international yard-and-pound agreement. The metric gram itself dates to 1795 when the French Academy of Sciences chose it as one-thousandth of the kilogram base unit. The two systems coexisted in commerce until international postal regulations and food-safety labeling requirements in the late twentieth century forced manufacturers to print both figures on every package shipped across borders.
FAQ
How many grams is 1 ounce?
One avoirdupois ounce equals 28.3495 grams. The rounded figure 28 g is close enough for most kitchen work, while 28.35 g is the standard precision used in commercial food labeling and pharmaceutical packaging.
How do I convert oz to grams in cooking?
Multiply by 28.35. A 4 oz portion of meat equals 113.4 g, a 6 oz can of tomato paste equals 170 g, and a 12 oz craft beer pour equals 340 g. American recipes that list ingredients in ounces translate cleanly into grams for use on a kitchen digital scale, which is now the default measurement instrument in serious cooking.
What is 8 oz in grams?
Eight ounces equals 226.8 grams — coincidentally very close to the standard 227 g block of cream cheese sold in most American supermarkets. The Philadelphia 8 oz brick is actually 227 grams as printed on the metric side of the label.
Why do food labels show both oz and g?
International labeling regulations and cross-border distribution agreements require dual units. American food companies that export to Europe, Canada, or the UK must include gram weights for compliance, and most just print both on the domestic label too because it's cheaper to run one packaging SKU than two.