Ounces to Grams Converter (oz to g)
Ounces to Grams Converter
Convert ounces (oz) to grams (g) instantly with this high-precision avoirdupois weight calculator. Ideal for home cooks following international culinary recipes, bakers perfecting pastry hydration ratios, nutritional diet tracking on packaged foods, and postal mail scale verification.
How to use this converter
- Enter your value in ounces in the input field above.
- Ensure Ounces (oz) is selected in the “From” dropdown.
- Ensure Grams (g) is selected in the “To” dropdown.
- The exact gram equivalent updates automatically in real time.
- Switch to pounds, kilograms, or milligrams whenever your recipe or shipping documentation requires different measurement orders of magnitude.
Ounces to grams formula and exact values
Under the international avoirdupois system established in 1959, an ounce is legally defined as exactly one-sixteenth of an avoirdupois pound. In metric terms, one avoirdupois ounce equals exactly 28.349523125 grams.
To convert ounces to grams, multiply the number of ounces by 28.349523 (or use 28.35 for everyday kitchen estimations):
Primary Formula:
grams = ounces × 28.3495
Reverse Formula:
ounces = grams ÷ 28.349523 (or ounces = grams × 0.035274)
Step-by-step calculation example
Suppose an American chocolate cookie recipe calls for 6 ounces of semisweet chocolate chips, but your digital kitchen scale only measures in metric grams:
- Identify the starting mass: 6 oz.
- Multiply by the official international conversion factor: 6 × 28.349523 = 170.097138 g.
- Round to the precision of your kitchen scale (typically one decimal place): 170.1 grams.
Ounces to grams conversion table
| Ounces (oz) | Grams (g) | Everyday Culinary / Postal Context |
|---|---|---|
| 0.25 oz | 7.09 g | ~1/4 oz (Quarter-ounce packet) |
| 0.5 oz | 14.17 g | 1 tablespoon butter or dry yeast packet |
| 1 oz | 28.35 g | Single serving of hard cheese / 1 USPS letter |
| 2 oz | 56.70 g | Standard airline liquor mini / golf ball mass |
| 3 oz | 85.05 g | Palm-sized portion of chicken or fish |
| 4 oz | 113.40 g | Quarter-pound burger patty / 1 stick of butter |
| 6 oz | 170.10 g | Standard individual yogurt container |
| 8 oz | 226.80 g | Half-pound package of cream cheese |
| 12 oz | 340.19 g | Standard beverage can contents by weight |
| 16 oz | 453.59 g | Exactly 1 US avoirdupois pound |
| 24 oz | 680.39 g | 1.5 pounds (Family-sized bread loaf) |
| 32 oz | 907.19 g | 2 pounds (Quart carton net weight) |
Culinary precision vs. fluid ounce volume confusion
The most common mistake in home kitchens is confusing weight ounces (oz) with fluid ounces (fl oz):
- Ounces (Avoirdupois): A unit of pure mass/weight. 8 ounces of flour on a scale weighs ~226.8 grams.
- Fluid Ounces: A unit of volume (liquid space). One US fluid ounce equals ~29.57 milliliters. Because flour is fluffy and less dense than water, an 8-fluid-ounce measuring cup contains only about 120 to 125 grams of flour, not 226.8 grams!
- Water Exception: Only water has a density where 1 fluid ounce weighs almost exactly 1 ounce by weight at room temperature. For dry ingredients like sugar, flour, and cocoa powder, always measure with a digital scale in grams for consistent baking results.
Frequently asked questions
How many grams are in 1 ounce?
There are exactly 28.349523125 grams in one avoirdupois ounce. For cooking, baking, and general household use, this is rounded to 28.35 grams.
Is 1 ounce equal to 30 grams on nutrition labels?
For US FDA nutrition labeling regulations, 1 ounce is legally rounded to 28 grams or occasionally 30 grams for serving size rounding guidelines. However, for baking chemistry and scientific weighing, the accurate factor remains 28.35 g.
What is the difference between a food ounce and a troy ounce?
Food, postal mail, and commercial consumer goods use avoirdupois ounces (28.35 g). Precious metals like gold, silver, and platinum are measured in troy ounces, where 1 troy ounce equals 31.1035 grams (~9.7% heavier).
How do you convert ounces to grams mentally?
For a quick mental approximation without a calculator, multiply the ounces by 30 and subtract 5%. For example, for 4 oz: 4 × 30 = 120; 120 – 6 = 114 g (exact is 113.4 g).
Related weight converters and tools
- Grams to Ounces Converter – Reverse conversion from metric grams back into avoirdupois ounces.
- Pounds to Ounces Converter – Convert larger pound weights into fractional ounces.
- Ounces to Pounds Converter – Aggregate ounce quantities into whole pounds for shipping.
- Ounces to Kilograms Converter – Convert packaging ounces directly into metric kilograms.
- All Weight Converters – Access our comprehensive directory of mass and weight calculators.
- Volume Converters – Convert fluid ounces, milliliters, liters, cups, and gallons.